The Experts below are selected from a list of 7728 Experts worldwide ranked by ideXlab platform

Zuohua Huang - One of the best experts on this subject based on the ideXlab platform.

  • direct numerical simulation of dme auto ignition with temperature and composition stratification under hcci engine conditions
    Fuel, 2021
    Co-Authors: Meng Zhang, Jinhua Wang, Zuohua Huang
    Abstract:

    Abstract Two-dimensional (2D) direct numerical simulation (DNS) was used to reveal the effect of temperature and composition stratifications on the ignition characteristics of dimethyl-ether (DME)/air mixture at three initial mean temperatures. The simulation was conducted within a constant volume with an isotropic turbulence condition under 40 bar. Nine 2-D cases with temperature stratification (T′), composition stratification (Ф′) and different T-Ф correlations (negative-correlated, uncorrelated, positive-correlated) were performed under the mean initial temperature of T0 = 780 K, 840 K and 1037 K. The results show that the mean heat release rate (HRR) distribution largely depends on T0 when temperature stratification was applied. When T0 = 780 K, T′ can obviously reduce the maximum of mean HRR and prolong Combustion Duration compared with 0D case. However, the HRR profile is barely changed for T0 = 940 K and 1037 K. Whereas, it was found that composition stratification can reduce the peak value of mean HRR and spread out HRR distribution regardless of initial mean temperature. For first ignition stage, the temperature stratification has larger effect on reducing HRR than composition stratification. Three cases with different T-Ф correlations all reduce the peak value of HRR at first ignition stage. However, for high temperature stage, UC and PC T-Ф field can largely reduce the peak value of HRR and prolong Combustion Duration while NC T-Ф field shows no visible effect on HRR. In addition, two different Combustion modes i.e. flame propagation mode and volumetric auto-ignition mode were distinguished according to HRR contours, budget term and volume averaged temperature gradient. And the mass fraction of YOH+HO2 and YH are the more reasonable choice to track the flame front.

  • high methane natural gas air explosion characteristics in confined vessel
    Journal of Hazardous Materials, 2014
    Co-Authors: Chenglong Tang, Zuohua Huang, Shuang Zhang, Zhanbo Si, Kongming Zhang
    Abstract:

    The explosion characteristics of high methane fraction natural gas were investigated in a constant volume Combustion vessel at different initial conditions. RESULTS show that with the increase of initial pressure, the peak explosion pressure, the maximum rate of pressure rise increase due to a higher amount (mass) of flammable mixture, which delivers an increased amount of heat. The increased total flame Duration and flame development time result as a consequence of the higher amount of flammable mixture. With the increase of the initial temperature, the peak explosion pressures decrease, but the pressure increase during Combustion is accelerated, which indicates a faster flame speed and heat release rate. The maximum value of the explosion pressure, the maximum rate of pressure rise, the minimum total Combustion Duration and the minimum flame development time is observed when the equivalence ratio of the mixture is 1.1. Additionally, for higher methane fraction natural gas, the explosion pressure and the maximum rate of pressure rise are slightly decreased, while the Combustion Duration is postponed. The Combustion phasing is empirically correlated with the experimental parameters with good fitting performance. Furthermore, the addition of dilute gas significantly reduces the explosion pressure, the maximum rate of pressure rise and postpones the flame development and this flame retarding effect of carbon dioxide is stronger than that of nitrogen. Language: en

  • dynamics of cycle to cycle variations in a natural gas direct injection spark ignition engine
    Applied Energy, 2011
    Co-Authors: Asok K Sen, Jianjun Zheng, Zuohua Huang
    Abstract:

    The dynamics of cycle-to-cycle variations (CCV) was investigated in a natural gas direct-injection spark-ignition engine. The method of continuous wavelet transform was used to analyze the time series of the indicated mean effective pressure (IMEP) and other Combustion variables. The dominant oscillatory modes in the CCV were identified, and the engine cycles over which these modes may persist were delineated. Results were obtained for four compression ratios: CRÂ =Â 8, 10, 12 and 14, at two engine speeds of 1200 and 1800Â rpm. The results reveal that the CCV exhibit multiscale dynamics with fluctuations occurring at different timescales. At the engine speed of 1200Â rpm, the spectral power of CCV for CRÂ =Â 12 was found to be significantly reduced at the different timescales compared to the CCV at other values of CR. At the higher engine speed of 1800Â rpm, this reduction was less pronounced. In addition, cross wavelet transform was used to explore the relationships between the CCV of IMEP and those of flame development Duration, main Combustion Duration and total Combustion Duration. Strong interdependence was found to exist between the IMEP and main Combustion Duration as well as total Combustion Duration, over a wide range of frequencies and engine cycles.

  • Combustion and particulate emission characteristics of a diesel engine fuelled with diesel dimethoxymethane blends
    Proceedings of the Institution of Mechanical Engineers. Part D Journal of automobile engineering, 2010
    Co-Authors: Ruijun Zhu, Xibin Wang, Haiyan Miao, Zuohua Huang
    Abstract:

    The effect of fuel constituents on the Combustion and particle emission char- acteristics of a compression ignition engine fuelled with diesel-dimethoxymethane (DMM) blends is investigated experimentally. Four engine loads at the maximum torque engine speed of 1600r/min and rated engine speed of 2200r/min were carried out respectively. Three diesel-DMM blended fuels containing 15 vol %, 30 vol %, and 50 vol % DMM, corresponding to 6.35 mass %, 12.67 mass %, and 21.11 mass % oxygen in the blends were used. The study showed that the ignition delay experienced a slight increase while the rapid Combustion Duration and the total Combustion Duration decreased with increase in the DMM fraction in the fuel blends. The maximum cylinder pressure, the maximum rate of pressure rise, and the maximum rate of heat release increase with the addition of DMM to the blended fuels. More- over, the smoke concentration decreases with increase in the oxygen mass fraction in the blends and the reduction rate reaches 80 per cent for 50 vol % DMM in the blend under a high engine load. The influence of DMM on the nanoparticulate distribution was also studied in the tests and it was found that the total number of nanosized particulates are all reduced with in- crease in the oxygen content in the blends.

  • explosion characteristics of hydrogen nitrogen air mixtures at elevated pressures and temperatures
    International Journal of Hydrogen Energy, 2009
    Co-Authors: Chenglong Tang, Jinhua Wang, Xibin Wang, Zuohua Huang, Chun Jin, Haiyan Miao
    Abstract:

    Abstract An experimental study on the Combustion characteristics of nitrogen diluted hydrogen was conducted in a constant volume Combustion vessel over a wide range of equivalence ratios and dilution ratios at elevated pressures and temperatures. The explosion characteristics such as the explosion pressure, the Combustion Duration, the maximum rate of pressure rise, the deflagration index and the normalized mass burning rate were derived. The result shows that a short Combustion Duration and higher normalized mass burning rate were presented with the increase of equivalence ratio. With the increase of initial temperature, the explosion pressure, the maximum rate of pressure rise and the deflagration index were decreased, and a shorter Combustion Duration and higher normalized mass burning rate were presented. With the increase of initial pressure, the explosion pressure, the maximum rate of pressure rise and the deflagration index increase, a shorter Combustion Duration and higher normalized mass burning rate were presented. Nitrogen dilution significantly reduces the normalized mass burning rate and the deflagration index and thus the potential of explosion hazards.

Bing Liu - One of the best experts on this subject based on the ideXlab platform.

  • experimental study on Combustion characteristics of a spark ignition engine fueled with natural gas hydrogen blends combining with egr
    International Journal of Hydrogen Energy, 2009
    Co-Authors: Erjiang Hu, Jianjun Zheng, Bing Liu, Xiaolei Gu
    Abstract:

    Abstract An experimental study on the effect of hydrogen fraction and EGR rate on the Combustion characteristics of a spark-ignition engine fueled with natural gas–hydrogen blends was investigated. The results show that flame development Duration, rapid Combustion Duration and total Combustion Duration are increased with the increase of EGR rate and decreased with the increase of hydrogen fraction in the blends. Hydrogen addition shows larger influence on flame development Duration than that on rapid Combustion Duration. The coefficient of variation of the indicated mean effective pressure increases with the increase of EGR rate. And hydrogen addition into natural gas decreases the coefficient of variation of the indicated mean effective pressure, and this effectiveness becomes more obviously at high EGR rate. Engine fueled with natural gas–hydrogen blends combining with proper EGR rate can realize the stable low temperature Combustion in gas engine.

  • experimental study on Combustion characteristics of a spark ignition engine fueled with natural gas hydrogen blends combining with egr
    International Journal of Hydrogen Energy, 2009
    Co-Authors: Erjiang Hu, Jianjun Zheng, Bing Liu, Zuohua Huang, Xiaolei Gu
    Abstract:

    Abstract An experimental study on the effect of hydrogen fraction and EGR rate on the Combustion characteristics of a spark-ignition engine fueled with natural gas–hydrogen blends was investigated. The results show that flame development Duration, rapid Combustion Duration and total Combustion Duration are increased with the increase of EGR rate and decreased with the increase of hydrogen fraction in the blends. Hydrogen addition shows larger influence on flame development Duration than that on rapid Combustion Duration. The coefficient of variation of the indicated mean effective pressure increases with the increase of EGR rate. And hydrogen addition into natural gas decreases the coefficient of variation of the indicated mean effective pressure, and this effectiveness becomes more obviously at high EGR rate. Engine fueled with natural gas–hydrogen blends combining with proper EGR rate can realize the stable low temperature Combustion in gas engine.

  • Combustion characteristics of a direct-injection engine fueled with natural gas-hydrogen mixtures
    Energy & Fuels, 2006
    Co-Authors: Jinhua Wang, Jinrong Yu, Bing Liu, Ke Zeng, Deming Jiang
    Abstract:

    In this article, we experimentally studied Combustion characteristics of a direct-injection spark-ignited engine fueled with natural gas-hydrogen blends. For a specific operation mode, the results show that the heat release rate decreases with the increase of hydrogen fraction in the blends when hydrogen fraction is less than a certain volumetric fraction while the heat release rate increases with the increase of hydrogen fraction in the blends when hydrogen fraction is over a certain value. This phenomenon indicates that only when the hydrogen fraction in natural gas reaches a certain fraction can a large improvement in Combustion be realized. Flame development Duration, rapid Combustion Duration, and total Combustion Duration increase with the increase of hydrogen fraction in the blends when hydrogen fraction is less than a certain volumetric fraction, while they decrease with the increase of hydrogen fraction when hydrogen fraction is over the value. The crank angle of the center of heat release curve moves away from the top-dead-center with the increase of hydrogen fraction in the blends when the hydrogen fraction is less than a certain volumetric fraction, and it moves close to the top-dead-center when hydrogen fraction is over the certain value. Maximum cylinder gas pressure, maximum mean gas temperature, maximum rate of pressure rise, and maximum heat release rate decrease with the increase of hydrogen fraction when the hydrogen fraction is less than a certain volumetric fraction, and they increase with the increase of hydrogen fraction when hydrogen fraction is over the certain value. For fixed injection Duration, the influence of hydrogen addition on natural gas-hydrogen mixture Combustion is larger at low engine speed operation condition than that at high engine speed operation condition.

  • Combustion behaviors of a compression ignition engine fuelled with diesel methanol blends under various fuel delivery advance angles
    Bioresource Technology, 2004
    Co-Authors: Deming Jiang, Bing Liu, Ke Zeng, Junqiang Zhang, Xibin Wang
    Abstract:

    A stabilized diesel/methanol blend was described and the basic Combustion behaviors based on the cylinder pressure analysis was conducted in a compression-ignition engine. The study showed that increasing methanol mass fraction of the diesel/methanol blends would increase the heat release rate in the premixed burning phase and shorten the Combustion Duration of the diffusive burning phase. The ignition delay increased with the advancing of the fuel delivery advance angle for both the diesel fuel and the diesel/methanol blends. For a specific fuel delivery advance angle, the ignition delay increased with the increase of the methanol mass fraction (oxygen mass fraction) in the fuel blends and the behaviors were more obvious at low engine load and/or high engine speed. The rapid burn Duration and the total Combustion Duration increased with the advancing of the fuel delivery advance angle. The centre of the heat release curve was close to the top-dead-centre with the advancing of the fuel delivery advance angle. Maximum cylinder gas pressure increased with the advancing of the fuel delivery advance angle, and the maximum cylinder gas pressure of the diesel/methanol blends gave a higher value than that of the diesel fuel. The maximum mean gas temperature remained almost unchanged or had a slight increase with the advancing of the fuel delivery advance angle, and it only slightly increased for the diesel/methanol blends compared to that of the diesel fuel. The maximum rate of pressure rise and the maximum rate of heat release increased with the advancing of the fuel delivery advance angle of the diesel/methanol blends and the value was highest for the diesel/methanol blends.

  • Combustion characteristics and heat release analysis of a compression ignition engine operating on a diesel methanol blend
    Proceedings of the Institution of Mechanical Engineers. Part D Journal of automobile engineering, 2004
    Co-Authors: Zuohua Huang, Deming Jiang, Bing Liu, Ke Zeng, Junqiang Zhang, Xibin Wang
    Abstract:

    A stabilized diesel/methanol blend was developed and the Combustion characteristics and heat release analysis of this blend was carried out in a compression ignition engine. The study showed that the increase in the methanol mass fraction will result in an increase in the heat release rate in the premixed burning phase and shorten the Combustion Duration of the diffusive burning phase. Ignition delay increases with the increase in the methanol mass fraction and the behaviour is more obvious at low engine load and high engine speed. The rapid-burn Duration varies little with the methanol mass fraction and the total Combustion Duration decreases with the increase in the methanol mass fraction. At a low engine speed, the centre of heat release curve tends to be close to the top dead centre (TDC ), with an increase in the methanol mass fraction at all engine loads and fuel delivery advance angles, the maximum rate of pressure rise and the maximum rate of heat release increase with the increase in the methanol mass fraction. At a high engine speed, the centre of the heat release curve closes to TDC at high engine load and will depart from TDC at low engine load. The maximum rate of pressure rise and heat release gives an increasing trend with the increase of methanol mass fraction at high engine loads. The maximum cylinder pressure increases with the increase of the methanol mass fraction. The presence of oxygen reduces the peak pressure, but the reduction was found to be insensitive to the proportion of oxygen within the 6-11 per cent range of testing.

Zhichao Zhao - One of the best experts on this subject based on the ideXlab platform.

  • experimental and computational study on the effects of injection timing on thermodynamics Combustion and emission characteristics of a natural gas ng diesel dual fuel engine at low speed and low load
    Energy Conversion and Management, 2018
    Co-Authors: Jianqin Fu, Lei Zhang, Zhichao Zhao
    Abstract:

    Abstract In this study, the thermodynamics, Combustion and emission characteristics of a NG-diesel dual fuel engine with varying pilot injection degree at low speed and low load were investigated by computational fluid dynamics (CFD) simulation and bench test. Based on tested in-cylinder pressure, the in-cylinder Combustion process of NG-diesel dual fuel engine was quantitatively analyzed. On this basis, both the one-dimensional and three-dimensional CFD simulated models were built and then validated by tested data, which were used to analyze the Combustion and emission characteristics of NG-diesel dual fuel engine. From this study, the effects of advanced pilot injection degree (APID) on the thermodynamics, Combustion and emission characteristics of NG-diesel dual fuel engine were found. With the advancing of pilot injection degree, both the SOC and 50% Combustion position are advanced, which leads the maximum in-cylinder pressure and heat release rate (HRR) to increase. The 10–50% Combustion Duration decreases slightly but the 50–90% Combustion Duration increases obviously. Meanwhile, both the effective expansion efficiency (EEE) and the percent of heat transfer loss increase, while their increase rates are different, which make the brake thermal efficiency (BTE) firstly increase and then decrease. The BSNOx increases largely while the BSTHC is almost unchanged with the advance of injection timing. Although more HC is generated in the early stage as the pilot injection degree is retarded, the post-Combustion becomes clear which accelerates the oxidation of HC. All these have provided theoretical guidance and data support for improving the performance of NG-diesel dual fuel engine.

  • experimental and computational study on the effects of injection timing on thermodynamics Combustion and emission characteristics of a natural gas ng diesel dual fuel engine at low speed and low load
    Energy Conversion and Management, 2018
    Co-Authors: Jun Shu, Lei Zhang, Jingping Liu, Zhichao Zhao
    Abstract:

    Abstract In this study, the thermodynamics, Combustion and emission characteristics of a NG-diesel dual fuel engine with varying pilot injection degree at low speed and low load were investigated by computational fluid dynamics (CFD) simulation and bench test. Based on tested in-cylinder pressure, the in-cylinder Combustion process of NG-diesel dual fuel engine was quantitatively analyzed. On this basis, both the one-dimensional and three-dimensional CFD simulated models were built and then validated by tested data, which were used to analyze the Combustion and emission characteristics of NG-diesel dual fuel engine. From this study, the effects of advanced pilot injection degree (APID) on the thermodynamics, Combustion and emission characteristics of NG-diesel dual fuel engine were found. With the advancing of pilot injection degree, both the SOC and 50% Combustion position are advanced, which leads the maximum in-cylinder pressure and heat release rate (HRR) to increase. The 10–50% Combustion Duration decreases slightly but the 50–90% Combustion Duration increases obviously. Meanwhile, both the effective expansion efficiency (EEE) and the percent of heat transfer loss increase, while their increase rates are different, which make the brake thermal efficiency (BTE) firstly increase and then decrease. The BSNOx increases largely while the BSTHC is almost unchanged with the advance of injection timing. Although more HC is generated in the early stage as the pilot injection degree is retarded, the post-Combustion becomes clear which accelerates the oxidation of HC. All these have provided theoretical guidance and data support for improving the performance of NG-diesel dual fuel engine.

Jingping Liu - One of the best experts on this subject based on the ideXlab platform.

  • effects of natural gas composition and compression ratio on the thermodynamic and Combustion characteristics of a heavy duty lean burn si engine fueled with liquefied natural gas
    Fuel, 2019
    Co-Authors: Jingping Liu, Xiongbo Duan, Yiqun Liu, Ming Chia Lai, Genmiao Guo, Zheng Chen, Banglin Deng
    Abstract:

    Abstract In this study, the effects of natural gas composition and compression ratio on thermodynamic and Combustion characteristics were comprehensively investigated using a spark ignition liquefied natural gas engine modified from a heavy-duty compression ignition engine. LNG fuel samples with two different methane compositions and a series of compression ratios were tested and analyzed with the same boundary conditions at a lean burn condition of 1.38 excess air/fuel ratio. The results indicated that the in-cylinder pressures of the heavy-duty spark ignition engine increased with increasing compression ratio (CR), while the magnitude of the increase of the peak Combustion pressure firstly increased, reached a peak value at the compression ratio of 14 and then decreased. However, the heat release phasing advanced with increasing CR, the ignition delay and the Combustion Duration shortened with the 50% Combustion location advancing toward the top dead center with increasing CR. Apart from that, the cycle-to-cycle variations of the Combustion Duration and peak Combustion pressure were decreased with increasing CR. The peak Combustion pressure declined with the prolonged the Combustion Duration. In addition, the location of the maximum pressure rise rate advanced and the coefficient of variation of the indicated mean effective pressure decreased with increasing CR. Consequentially, the brake thermal efficiency increased and the brake specific fuel consumption decreased with the increase of the CR. The laminar flame speed of LNG 1-air was slightly higher than that LNG 2-air due to the higher ethane concentration and its higher laminar flame speed.

  • effects of injector spray angle on Combustion and emissions characteristics of a natural gas ng diesel dual fuel engine based on cfd coupled with reduced chemical kinetic model
    Applied Energy, 2019
    Co-Authors: Jun Shu, Jingping Liu, Banglin Deng, Shuqian Wang, Dongjian Zeng
    Abstract:

    Abstract In this research, the computational fluid dynamics (CFD) coupled with reduced chemical kinetic model was applied to study the Combustion process and emissions characteristics of a NG-diesel dual fuel engine at various injector spray angles. The model was validated by measured data of in-cylinder pressure, heat release rate (HRR) and emissions (nitrogen oxide (NOx), hydrocarbons (HC), carbon monoxide (CO)) in the NG-diesel dual fuel engine. The validated CFD models were used to investigate the immediate process of Combustion and emissions of NG-diesel dual fuel engine with the variation of spray angle. The results showed that the peak cylinder pressure increases as the spray angle increases from 60° to 140°, but slightly decreases if the spray angle continues to increase to 160°. Except for the condition of 1000 rpm and 50% load, the start of Combustion (SOC), CA50, 10–50% Combustion Duration, CA90, 50–90% Combustion Duration and 10–90% Combustion Duration decrease as the spray angle increases from 60° to 120°, and keep minor fluctuations when the spray angle increases from 120° to 160°. The NOx emissions ascend when the spray angle increases from 60° to 140° and changes little if it continues to increase from 140° to 160°. Nevertheless, the unburned methane is almost unchangeable at 1000 rpm and 100% load. When the spray angle ranges between 120° and 160°, the CO emissions keep at a lower level. All these have provided visual data and theoretical guidance for improving the Combustion and emissions performance of NG-diesel dual fuel engine.

  • experimental and computational study on the effects of injection timing on thermodynamics Combustion and emission characteristics of a natural gas ng diesel dual fuel engine at low speed and low load
    Energy Conversion and Management, 2018
    Co-Authors: Jun Shu, Lei Zhang, Jingping Liu, Zhichao Zhao
    Abstract:

    Abstract In this study, the thermodynamics, Combustion and emission characteristics of a NG-diesel dual fuel engine with varying pilot injection degree at low speed and low load were investigated by computational fluid dynamics (CFD) simulation and bench test. Based on tested in-cylinder pressure, the in-cylinder Combustion process of NG-diesel dual fuel engine was quantitatively analyzed. On this basis, both the one-dimensional and three-dimensional CFD simulated models were built and then validated by tested data, which were used to analyze the Combustion and emission characteristics of NG-diesel dual fuel engine. From this study, the effects of advanced pilot injection degree (APID) on the thermodynamics, Combustion and emission characteristics of NG-diesel dual fuel engine were found. With the advancing of pilot injection degree, both the SOC and 50% Combustion position are advanced, which leads the maximum in-cylinder pressure and heat release rate (HRR) to increase. The 10–50% Combustion Duration decreases slightly but the 50–90% Combustion Duration increases obviously. Meanwhile, both the effective expansion efficiency (EEE) and the percent of heat transfer loss increase, while their increase rates are different, which make the brake thermal efficiency (BTE) firstly increase and then decrease. The BSNOx increases largely while the BSTHC is almost unchanged with the advance of injection timing. Although more HC is generated in the early stage as the pilot injection degree is retarded, the post-Combustion becomes clear which accelerates the oxidation of HC. All these have provided theoretical guidance and data support for improving the performance of NG-diesel dual fuel engine.

  • experimental study on Combustion and emission characteristics of turbocharged gasoline direct injection gdi engine under cold start new european driving cycle nedc
    Fuel, 2018
    Co-Authors: Guohui Zhu, Jingping Liu, Qiyi Guo, He Zhao
    Abstract:

    Abstract In this study, the Combustion and emission characteristics of a turbocharged GDI engine under cold start NEDC were investigated based on chassis dynamometer test. The operating states, Combustion and emission performance of GDI engine were measured continuously during vehicle driving cycles. Then, the Combustion and emission characteristics of GDI engine under cold start NEDC were obtained and the influence factors were revealed by synchronous analysis of various operating parameters. The results show that, the Combustion Duration from start of Combustion (SOC) to 50% Combustion location changes a little under cold start NEDC. At most time, the 10–90% Combustion Duration usually changes in the range of 20–40 °CA, which turns longer under idling conditions but shorter under acceleration conditions. Since the sparking timing is severely retarded in the beginning stages of NEDC, the effect of cold start on hydrocarbon (HC) emission is very limited. HC emission increases sharply under deceleration conditions, due to the decrease of engine indicated mean effective pressure (IMEP). Carbon monoxide (CO) emission does not seem to have relevance to the cold start condition, and it is very sensitive to excess air coefficient while the effects of other parameters are very little. Nitrogen oxide (NOx) emission increases under acceleration conditions but decreases under deceleration conditions, which is mainly influenced by the IMEP, then followed by engine speed. All those not only demonstrated the change rules of Combustion and emission characteristics of turbocharged GDI engine under cold start NEDC, but also provided the guidance for improving the vehicle emission performance.

Xiaolei Gu - One of the best experts on this subject based on the ideXlab platform.

  • experimental study on Combustion characteristics of a spark ignition engine fueled with natural gas hydrogen blends combining with egr
    International Journal of Hydrogen Energy, 2009
    Co-Authors: Erjiang Hu, Jianjun Zheng, Bing Liu, Xiaolei Gu
    Abstract:

    Abstract An experimental study on the effect of hydrogen fraction and EGR rate on the Combustion characteristics of a spark-ignition engine fueled with natural gas–hydrogen blends was investigated. The results show that flame development Duration, rapid Combustion Duration and total Combustion Duration are increased with the increase of EGR rate and decreased with the increase of hydrogen fraction in the blends. Hydrogen addition shows larger influence on flame development Duration than that on rapid Combustion Duration. The coefficient of variation of the indicated mean effective pressure increases with the increase of EGR rate. And hydrogen addition into natural gas decreases the coefficient of variation of the indicated mean effective pressure, and this effectiveness becomes more obviously at high EGR rate. Engine fueled with natural gas–hydrogen blends combining with proper EGR rate can realize the stable low temperature Combustion in gas engine.

  • experimental study on Combustion characteristics of a spark ignition engine fueled with natural gas hydrogen blends combining with egr
    International Journal of Hydrogen Energy, 2009
    Co-Authors: Erjiang Hu, Jianjun Zheng, Bing Liu, Zuohua Huang, Xiaolei Gu
    Abstract:

    Abstract An experimental study on the effect of hydrogen fraction and EGR rate on the Combustion characteristics of a spark-ignition engine fueled with natural gas–hydrogen blends was investigated. The results show that flame development Duration, rapid Combustion Duration and total Combustion Duration are increased with the increase of EGR rate and decreased with the increase of hydrogen fraction in the blends. Hydrogen addition shows larger influence on flame development Duration than that on rapid Combustion Duration. The coefficient of variation of the indicated mean effective pressure increases with the increase of EGR rate. And hydrogen addition into natural gas decreases the coefficient of variation of the indicated mean effective pressure, and this effectiveness becomes more obviously at high EGR rate. Engine fueled with natural gas–hydrogen blends combining with proper EGR rate can realize the stable low temperature Combustion in gas engine.