The Experts below are selected from a list of 87663 Experts worldwide ranked by ideXlab platform
Bingjie Chen - One of the best experts on this subject based on the ideXlab platform.
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Exploring Gasoline oxidation chemistry in jet stirred reactors
Fuel, 2019Co-Authors: Bingjie Chen, Casimir Togbé, Zhandong Wang, Jui-yang Wang, Haoyi Wang, Pablo Emmanuel Álvarez Alonso, Maram Almalki, Marco Mehl, William Pitz, Scott WagnonAbstract:Recent decades have seen increasingly restrictive regulations applied to Gasoline engines. Gasoline combustion chemistry must be investigated to achieve a better understanding and control of internal combustion engine efficiency and emissions. In this work, several Gasoline fuels, namely the FACE (Fuel for Advanced Combustion Engines) Gasolines, were selected as targets for oxidation study in jet-stirred reactors (JSR). The study is facilitated by formulating various Gasoline surrogate mixtures with known hydrocarbon compositions to represent the real Gasolines. Surrogates included binary mixtures of n-heptane and iso-octane, as well as more complex multi-component mixtures. The oxidation characteristics of FACE Gasolines and their surrogates were experimentally examined in JSR-1 and numerically simulated under the following conditions: pressure 1 bar, temperature 500–1050 K, residence time 1.0 and 2.0 s, and two equivalence ratios (ϕ=0.5 and 1.0). In the high temperature region, all real fuels and surrogates showed similar oxidation behavior, but in the low temperature region, a fuel’s octane number and composition had a significant effect on its JSR oxidation characteristics. Low octane number fuels displayed more low temperature reactivity, while fuels with similar octane number but a larger number of n-alkane components were more reactive. A Gasoline surrogate kinetic model was examined with FACE Gasoline experiments either measured in JSR-2, or taken from previous work under the following conditions: pressure 10 bar, temperature 530–1200 K, residence time 0.7 s, and three equivalence ratios (ϕ=0.5, 1.0 and 2.0). Comparison between FACE Gasoline experimental results with surrogate model predictions showed good agreement, demonstrating considerable potential for surrogate fuel kinetic modeling in engine simulations.
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jet stirred reactor oxidation of alkane rich face Gasoline fuels
Proceedings of the Combustion Institute, 2017Co-Authors: Bingjie Chen, Philippe Dagaut, Casimir Togbé, Zhandong Wang, Mani S SarathyAbstract:Abstract Understanding species evolution upon Gasoline fuel oxidation can aid in mitigating harmful emissions and improving combustion efficiency. Experimentally measured speciation profiles are also important targets for surrogate fuel kinetic models. This work presents the low- and high-temperature oxidation of two alkane-rich FACE Gasolines (A and C, Fuels for Advanced Combustion Engines) in a jet-stirred reactor at 10 bar and equivalence ratios from 0.5 to 2 by probe sampling combined with gas chromatography and Fourier Transformed Infrared Spectrometry analysis. Detailed speciation profiles as a function of temperature are presented and compared to understand the combustion chemistry of these two real fuels. Simulations were conducted using three surrogates (i.e., FGA2, FGC2, and FRF 84), which have similar physical and chemical properties as the two Gasolines. The experimental results reveal that the reactivity and major product distributions of these two alkane-rich FACE fuels are very similar, indicating that they have similar global reactivity despite their different compositions. The simulation results using all the surrogates capture the two-stage oxidation behavior of the two FACE Gasolines, but the extent of low temperature reactivity is over-predicted. The simulations were analyzed, with a focus on the n-heptane and n-butane sub-mechanisms, to help direct the future model development and surrogate fuel formulation strategies.
Scott Wagnon - One of the best experts on this subject based on the ideXlab platform.
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Exploring Gasoline oxidation chemistry in jet stirred reactors
Fuel, 2019Co-Authors: Bingjie Chen, Casimir Togbé, Zhandong Wang, Jui-yang Wang, Haoyi Wang, Pablo Emmanuel Álvarez Alonso, Maram Almalki, Marco Mehl, William Pitz, Scott WagnonAbstract:Recent decades have seen increasingly restrictive regulations applied to Gasoline engines. Gasoline combustion chemistry must be investigated to achieve a better understanding and control of internal combustion engine efficiency and emissions. In this work, several Gasoline fuels, namely the FACE (Fuel for Advanced Combustion Engines) Gasolines, were selected as targets for oxidation study in jet-stirred reactors (JSR). The study is facilitated by formulating various Gasoline surrogate mixtures with known hydrocarbon compositions to represent the real Gasolines. Surrogates included binary mixtures of n-heptane and iso-octane, as well as more complex multi-component mixtures. The oxidation characteristics of FACE Gasolines and their surrogates were experimentally examined in JSR-1 and numerically simulated under the following conditions: pressure 1 bar, temperature 500–1050 K, residence time 1.0 and 2.0 s, and two equivalence ratios (ϕ=0.5 and 1.0). In the high temperature region, all real fuels and surrogates showed similar oxidation behavior, but in the low temperature region, a fuel’s octane number and composition had a significant effect on its JSR oxidation characteristics. Low octane number fuels displayed more low temperature reactivity, while fuels with similar octane number but a larger number of n-alkane components were more reactive. A Gasoline surrogate kinetic model was examined with FACE Gasoline experiments either measured in JSR-2, or taken from previous work under the following conditions: pressure 10 bar, temperature 530–1200 K, residence time 0.7 s, and three equivalence ratios (ϕ=0.5, 1.0 and 2.0). Comparison between FACE Gasoline experimental results with surrogate model predictions showed good agreement, demonstrating considerable potential for surrogate fuel kinetic modeling in engine simulations.
Zhandong Wang - One of the best experts on this subject based on the ideXlab platform.
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Exploring Gasoline oxidation chemistry in jet stirred reactors
Fuel, 2019Co-Authors: Bingjie Chen, Casimir Togbé, Zhandong Wang, Jui-yang Wang, Haoyi Wang, Pablo Emmanuel Álvarez Alonso, Maram Almalki, Marco Mehl, William Pitz, Scott WagnonAbstract:Recent decades have seen increasingly restrictive regulations applied to Gasoline engines. Gasoline combustion chemistry must be investigated to achieve a better understanding and control of internal combustion engine efficiency and emissions. In this work, several Gasoline fuels, namely the FACE (Fuel for Advanced Combustion Engines) Gasolines, were selected as targets for oxidation study in jet-stirred reactors (JSR). The study is facilitated by formulating various Gasoline surrogate mixtures with known hydrocarbon compositions to represent the real Gasolines. Surrogates included binary mixtures of n-heptane and iso-octane, as well as more complex multi-component mixtures. The oxidation characteristics of FACE Gasolines and their surrogates were experimentally examined in JSR-1 and numerically simulated under the following conditions: pressure 1 bar, temperature 500–1050 K, residence time 1.0 and 2.0 s, and two equivalence ratios (ϕ=0.5 and 1.0). In the high temperature region, all real fuels and surrogates showed similar oxidation behavior, but in the low temperature region, a fuel’s octane number and composition had a significant effect on its JSR oxidation characteristics. Low octane number fuels displayed more low temperature reactivity, while fuels with similar octane number but a larger number of n-alkane components were more reactive. A Gasoline surrogate kinetic model was examined with FACE Gasoline experiments either measured in JSR-2, or taken from previous work under the following conditions: pressure 10 bar, temperature 530–1200 K, residence time 0.7 s, and three equivalence ratios (ϕ=0.5, 1.0 and 2.0). Comparison between FACE Gasoline experimental results with surrogate model predictions showed good agreement, demonstrating considerable potential for surrogate fuel kinetic modeling in engine simulations.
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jet stirred reactor oxidation of alkane rich face Gasoline fuels
Proceedings of the Combustion Institute, 2017Co-Authors: Bingjie Chen, Philippe Dagaut, Casimir Togbé, Zhandong Wang, Mani S SarathyAbstract:Abstract Understanding species evolution upon Gasoline fuel oxidation can aid in mitigating harmful emissions and improving combustion efficiency. Experimentally measured speciation profiles are also important targets for surrogate fuel kinetic models. This work presents the low- and high-temperature oxidation of two alkane-rich FACE Gasolines (A and C, Fuels for Advanced Combustion Engines) in a jet-stirred reactor at 10 bar and equivalence ratios from 0.5 to 2 by probe sampling combined with gas chromatography and Fourier Transformed Infrared Spectrometry analysis. Detailed speciation profiles as a function of temperature are presented and compared to understand the combustion chemistry of these two real fuels. Simulations were conducted using three surrogates (i.e., FGA2, FGC2, and FRF 84), which have similar physical and chemical properties as the two Gasolines. The experimental results reveal that the reactivity and major product distributions of these two alkane-rich FACE fuels are very similar, indicating that they have similar global reactivity despite their different compositions. The simulation results using all the surrogates capture the two-stage oxidation behavior of the two FACE Gasolines, but the extent of low temperature reactivity is over-predicted. The simulations were analyzed, with a focus on the n-heptane and n-butane sub-mechanisms, to help direct the future model development and surrogate fuel formulation strategies.
Casimir Togbé - One of the best experts on this subject based on the ideXlab platform.
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Exploring Gasoline oxidation chemistry in jet stirred reactors
Fuel, 2019Co-Authors: Bingjie Chen, Casimir Togbé, Zhandong Wang, Jui-yang Wang, Haoyi Wang, Pablo Emmanuel Álvarez Alonso, Maram Almalki, Marco Mehl, William Pitz, Scott WagnonAbstract:Recent decades have seen increasingly restrictive regulations applied to Gasoline engines. Gasoline combustion chemistry must be investigated to achieve a better understanding and control of internal combustion engine efficiency and emissions. In this work, several Gasoline fuels, namely the FACE (Fuel for Advanced Combustion Engines) Gasolines, were selected as targets for oxidation study in jet-stirred reactors (JSR). The study is facilitated by formulating various Gasoline surrogate mixtures with known hydrocarbon compositions to represent the real Gasolines. Surrogates included binary mixtures of n-heptane and iso-octane, as well as more complex multi-component mixtures. The oxidation characteristics of FACE Gasolines and their surrogates were experimentally examined in JSR-1 and numerically simulated under the following conditions: pressure 1 bar, temperature 500–1050 K, residence time 1.0 and 2.0 s, and two equivalence ratios (ϕ=0.5 and 1.0). In the high temperature region, all real fuels and surrogates showed similar oxidation behavior, but in the low temperature region, a fuel’s octane number and composition had a significant effect on its JSR oxidation characteristics. Low octane number fuels displayed more low temperature reactivity, while fuels with similar octane number but a larger number of n-alkane components were more reactive. A Gasoline surrogate kinetic model was examined with FACE Gasoline experiments either measured in JSR-2, or taken from previous work under the following conditions: pressure 10 bar, temperature 530–1200 K, residence time 0.7 s, and three equivalence ratios (ϕ=0.5, 1.0 and 2.0). Comparison between FACE Gasoline experimental results with surrogate model predictions showed good agreement, demonstrating considerable potential for surrogate fuel kinetic modeling in engine simulations.
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jet stirred reactor oxidation of alkane rich face Gasoline fuels
Proceedings of the Combustion Institute, 2017Co-Authors: Bingjie Chen, Philippe Dagaut, Casimir Togbé, Zhandong Wang, Mani S SarathyAbstract:Abstract Understanding species evolution upon Gasoline fuel oxidation can aid in mitigating harmful emissions and improving combustion efficiency. Experimentally measured speciation profiles are also important targets for surrogate fuel kinetic models. This work presents the low- and high-temperature oxidation of two alkane-rich FACE Gasolines (A and C, Fuels for Advanced Combustion Engines) in a jet-stirred reactor at 10 bar and equivalence ratios from 0.5 to 2 by probe sampling combined with gas chromatography and Fourier Transformed Infrared Spectrometry analysis. Detailed speciation profiles as a function of temperature are presented and compared to understand the combustion chemistry of these two real fuels. Simulations were conducted using three surrogates (i.e., FGA2, FGC2, and FRF 84), which have similar physical and chemical properties as the two Gasolines. The experimental results reveal that the reactivity and major product distributions of these two alkane-rich FACE fuels are very similar, indicating that they have similar global reactivity despite their different compositions. The simulation results using all the surrogates capture the two-stage oxidation behavior of the two FACE Gasolines, but the extent of low temperature reactivity is over-predicted. The simulations were analyzed, with a focus on the n-heptane and n-butane sub-mechanisms, to help direct the future model development and surrogate fuel formulation strategies.
Angelo Onorati - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigations on high octane number Gasoline formulations for internal combustion engines
Fuel, 2013Co-Authors: T. Cerri, Gianluca D'errico, Angelo OnoratiAbstract:Abstract The attempt to achieve higher and higher levels of specific power output and efficiency has increased the complexity of the design process of both the engine and its management system. Among the different issues, it is also necessary to take into account the chemical and physical characteristics of the available fuels. In order to study the behavior of some Gasoline formulations characterized by a high octane number, the authors have carried out an experimental activity to understand how each fuel sample could improve the performances of a modern naturally aspirated SI (spark ignition) engine for passenger cars. The new fuel formulations were characterized by different contents of olefins and oxygen, the latter through the presence of oxygenated compounds like ethyl tert-butyl ether (ETBE) or methyl tert-butyl ether (MTBE). The experimental campaign consisted in measurements of the maximum brake torque (MBT) curve up to knock onset and the corresponding knock intensity, at wide open throttle (WOT) and partial load operating conditions, for each tested Gasoline sample. The results of the data analysis show that the evaluation of the enhanced characteristics of a Gasoline cannot be done by considering only the increase of the knock limit. Although a Gasoline is generally labeled only by its RON (Research Octane Number), it can extend the benefits due to particular chemical formulation from full load up to part load conditions and, may be, in transient situations, as pointed out in this work. A naturally aspirated SI engine, under steady operation and fueled by high octane number Gasolines, cannot provide a higher power output at WOT condition only by modifying the spark timing, if this engine has already been correctly optimized by the manufacturer before introducing it on the market. As a result, to achieve higher levels of power output it is necessary to modify the compression ratio, the Variable Intake System (VIS) and Valve Timing (VVT) strategies and so on, in order to exploit the high octane number offered by the new Gasolines tested. Moreover, the analysis of the experimental data has also confirmed that the Research Octane Number (RON) index is less important than the Motor Octane Number (MON) at high engine speeds and loads, useful to characterize the octane requirement for modern engines. Furthermore, a standard deviation analysis has been conducted on the BMF (Burned Mass Fraction) parameter to understand if the different characteristics of Gasolines could give advantages in terms of reduction of the CCV (Cyclic Combustion Variability). The results of the data analysis showed that the fuel formulations with higher content of oxygenated compounds exhibit a better behavior, highlighting a smaller CV (Coefficient of Variation) especially when reducing the load. This aspect could be considered one of the possible reasons of an improvement of the vehicle drivability.
