The Experts below are selected from a list of 9315 Experts worldwide ranked by ideXlab platform
Ziqiang Zhao - One of the best experts on this subject based on the ideXlab platform.
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Preliminary design and experimental verification of a triple swirler combustor
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering, 2015Co-Authors: Guoyu Ding, Xiaomin He, Ziqiang ZhaoAbstract:A preliminary combustor design procedure based on triple swirler is presented, and then a triple swirler combustor with design fuel–air ratio of 0.033 is designed according to the design procedure and studied experimentally. The test results show that: the total pressure loss coefficient increases linearly from 0.021 to 0.04 as the inlet Airflow Velocity increases from 40 m/s to 70 m/s, while the flow drag coefficient decreases nonlinearly with the inlet Airflow Velocity increasing; there exists an optimal Velocity, at which the ignition overall fuel–air ratio is minimal at each given inlet Airflow temperature, and the increasing of inlet Airflow temperature makes for combustor ignition; the lean blowout fuel–air ratio is no more than 0.005 for most cases at the inlet Airflow temperature of 473 K; the combustion efficiency is high at low fuel–air ratio and increases with inlet Airflow Velocity and temperature increasing on the whole. Pattern factor (OTDF) ranges from 0.15 to 0.17 for all cases at the inle...
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Effect of different triple swirlers on the performance of a triple swirler combustor
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering, 2014Co-Authors: Guoyu Ding, Xiaomin He, Ziqiang ZhaoAbstract:Broadening the stable combustion range is particularly desirable for future aircraft engines. The triple swirler is considered to be a promising solution. Experiments were conducted to study different triple swirlers on the performance of a triple swirler combustor, which includes several technology innovations at different inlet Airflow Velocity (40–70 m/s), temperature (296 K, 373 K, and 473 K), and combustor overall fuel–air ratio with fixed atmospheric pressure. The total pressure loss coefficient increases linearly, while the flow drag coefficient decreases nonlinearly as the inlet Airflow Velocity increases from 40 m/s to 70 m/s. The flow drag of the combustor assembling counter-rotating swirlers for intermediate swirler and outer swirler is less than that of co-rotating swirlers at the same inlet Airflow Velocity. The ignition overall fuel–air ratio and lean blowout fuel–air ratio decrease along with inlet Airflow Velocity and temperature increasing on the whole. The triple swirler with swirl number combination labeling “1.5-1-0.8” has better combustion performance than the other one labeling “0.7-1-1.5”. At the temperature of 473 K, the lean blowout fuel–air ratio is almost below 0.005 for the triple swirler with swirl number combination labeling "1.5-1-0.8” at different inlet Airflow Velocity, and from this point, it has proved the feasibility of the design rules of triple swirler combustor in this paper.
Ruifeng Tian - One of the best experts on this subject based on the ideXlab platform.
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Effect of physical property parameters on critical Airflow Velocity of a corrugated plate dryer
Annals of Nuclear Energy, 2020Co-Authors: Bo Wang, Bowen Chen, Ruifeng TianAbstract:Abstract Corrugated plate dryers are important steam-water separation devices in the steam generator of the nuclear power plant. No previous analysis of effect of physical property parameters on critical Airflow Velocity of corrugated plate dryer has been performed. Therefore, research in this area is innovative and novel. Based on theoretical correlation of the critical Airflow Velocity proposed in reference (Wang and Tian, 2020); effect of physical property parameters on critical conditions of the liquid film rupture under horizontal shear of Airflow is experimentally studied. In the experiment, pure water, 2.5% (mass fraction) butanol, and ethanol are selected as three different liquids, respectively. Thickness of the liquid film on corrugated plate wall is measured by PLIF (Plane Laser Induced Fluorescence) method. Experimental results show that liquid film rupture is related to the stability parameter Kapitza number. The larger the Kapitza number, the better the liquid film stability and the higher the critical Airflow Velocity.
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Analysis of fluctuation and breakdown characteristics of liquid film on corrugated plate wall
Annals of Nuclear Energy, 2020Co-Authors: Bo Wang, Bowen Chen, Ruifeng TianAbstract:Abstract Corrugated plate dryer is a very vital separation equipment for nuclear engineering and it is meaningful to study the flow, fluctuation and breakdown characteristics of the liquid film on corrugated plate wall. Liquid film thickness of steady flow is measured based on plane laser induced fluorescence (PLIF) technique and time series of liquid film thickness are obtained. Besides, amplitude and frequency domain information of liquid film fluctuations are analyzed by probability density function (PDF), power spectral density (PSD) and wavelet method. A two-dimensional liquid film breakdown model is established. Critical Airflow Velocity when the water film breakdown is measured experimentally. Based on theoretical results, equations for calculating critical Airflow Velocity of the corrugated plate under different liquid film thicknesses are fitted in the form of nike function. Fitting equations for calculating critical Airflow Velocity in the form of nike function agree well with experimental results.
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Study on characteristics of water film breakdown on the corrugated plate wall under the horizontal shear of Airflow
Nuclear Engineering and Design, 2019Co-Authors: Bo Wang, Ruifeng TianAbstract:Abstract The corrugated plate (CP) dryer is a very important component for the steam-water separation in the steam generator because the separation efficiency influences the overall thermal efficiency of a nuclear power plant. Carryover and breakdown phenomena of the water film at the corner of the CP have a great impact on the steam-water separation effect. The study of the complicated steam-water separation mechanism is beneficial to improving its efficiency. Breakdown and flow characteristics under horizontal shear of water film falling down from the vertical CP is studied. Water and air are used as the two phases in the study. This paper derives and validates a model for calculating the critical Airflow Velocity of water film breakdown at the corner of the CP. On the basis of the hydrodynamics theory and applying the image processing method, the relationship between water film thickness and critical Airflow Velocity of water film breakdown is investigated through an experiment. Additionally, the water film thickness is measured with the application of the Charge Coupled Device (CCD) high-speed camera acquisition system. The Planar Laser Induced Fluorescence (PLIF) method is applied for the water thickness measurement in the experiment. Results reveal that the critical Airflow Velocity of water film breakdown is related to the CP structural parameters, properties of the two phases and water film thickness. Comparison of the experimental result and the result calculated by the model is performed as well. The results calculated by the developed model are in good agreement with the obtained experimental results as the water film thickness is large in a certain range. The results show that the critical Airflow Velocity of water film breakdown and the water film thickness are negatively correlated. In order to analyze the factors contributing to the critical Airflow Velocity of water film breakdown, three novel parameters are introduced firstly. In particular, the results reveal that a larger value of parameters is better to the increase of the critical Airflow Velocity of water film breakdown. And when the flexural angle of the CP corner is approximately 27 degrees, the steam-water separation performs best. It recommends that the flexural angle of the CP corner should not exceed 43.2 degrees.
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Investigation on Flow and Breakdown Characteristics Under Horizontal Shear of Water Film Falling Down Vertical Corrugated Plate Dryer
Volume 6A: Thermal-Hydraulics and Safety Analyses, 2018Co-Authors: Bo Wang, Ruifeng Tian, Chen Bowen, Mao FengAbstract:The corrugated plate dryer is a very important equipment for the steam-water separation in the steam generator. Its separation efficiency determines the economic indicators of nuclear power plants. The study of the complicated steam-water separation mechanism of the corrugated plate dryer is very helpful to improve its separation efficiency. Flow and breakdown characteristics under horizontal shear of water film falling down vertical corrugated plate dryer is investigated. Air and water are used as the two phases in the research. This paper also derives a model calculating the critical Airflow Velocity of water film breakdown and completes the comparison of the experimental result and the result calculated by the model. The relationship between the water film thickness and critical Airflow Velocity of water film breakdown is investigated through the experiment. In addition, the water film thickness is measured according to CCD high-speed camera acquisition system and the Planar Laser Induced Fluorescence (PLIF) method is also used for the measurement. The experimental result reveals that the critical Airflow Velocity of water film breakdown is related to the corrugated plate structural parameters, the properties of the two phases and the water film thickness. The critical Airflow Velocity of water film breakdown and the water film thickness are negatively correlated. The result calculated by the model is in good agreement with the experimental result as the water film thickness is large in a certain range.
Guoyu Ding - One of the best experts on this subject based on the ideXlab platform.
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Preliminary design and experimental verification of a triple swirler combustor
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering, 2015Co-Authors: Guoyu Ding, Xiaomin He, Ziqiang ZhaoAbstract:A preliminary combustor design procedure based on triple swirler is presented, and then a triple swirler combustor with design fuel–air ratio of 0.033 is designed according to the design procedure and studied experimentally. The test results show that: the total pressure loss coefficient increases linearly from 0.021 to 0.04 as the inlet Airflow Velocity increases from 40 m/s to 70 m/s, while the flow drag coefficient decreases nonlinearly with the inlet Airflow Velocity increasing; there exists an optimal Velocity, at which the ignition overall fuel–air ratio is minimal at each given inlet Airflow temperature, and the increasing of inlet Airflow temperature makes for combustor ignition; the lean blowout fuel–air ratio is no more than 0.005 for most cases at the inlet Airflow temperature of 473 K; the combustion efficiency is high at low fuel–air ratio and increases with inlet Airflow Velocity and temperature increasing on the whole. Pattern factor (OTDF) ranges from 0.15 to 0.17 for all cases at the inle...
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Effect of different triple swirlers on the performance of a triple swirler combustor
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering, 2014Co-Authors: Guoyu Ding, Xiaomin He, Ziqiang ZhaoAbstract:Broadening the stable combustion range is particularly desirable for future aircraft engines. The triple swirler is considered to be a promising solution. Experiments were conducted to study different triple swirlers on the performance of a triple swirler combustor, which includes several technology innovations at different inlet Airflow Velocity (40–70 m/s), temperature (296 K, 373 K, and 473 K), and combustor overall fuel–air ratio with fixed atmospheric pressure. The total pressure loss coefficient increases linearly, while the flow drag coefficient decreases nonlinearly as the inlet Airflow Velocity increases from 40 m/s to 70 m/s. The flow drag of the combustor assembling counter-rotating swirlers for intermediate swirler and outer swirler is less than that of co-rotating swirlers at the same inlet Airflow Velocity. The ignition overall fuel–air ratio and lean blowout fuel–air ratio decrease along with inlet Airflow Velocity and temperature increasing on the whole. The triple swirler with swirl number combination labeling “1.5-1-0.8” has better combustion performance than the other one labeling “0.7-1-1.5”. At the temperature of 473 K, the lean blowout fuel–air ratio is almost below 0.005 for the triple swirler with swirl number combination labeling "1.5-1-0.8” at different inlet Airflow Velocity, and from this point, it has proved the feasibility of the design rules of triple swirler combustor in this paper.
Bo Wang - One of the best experts on this subject based on the ideXlab platform.
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Effect of physical property parameters on critical Airflow Velocity of a corrugated plate dryer
Annals of Nuclear Energy, 2020Co-Authors: Bo Wang, Bowen Chen, Ruifeng TianAbstract:Abstract Corrugated plate dryers are important steam-water separation devices in the steam generator of the nuclear power plant. No previous analysis of effect of physical property parameters on critical Airflow Velocity of corrugated plate dryer has been performed. Therefore, research in this area is innovative and novel. Based on theoretical correlation of the critical Airflow Velocity proposed in reference (Wang and Tian, 2020); effect of physical property parameters on critical conditions of the liquid film rupture under horizontal shear of Airflow is experimentally studied. In the experiment, pure water, 2.5% (mass fraction) butanol, and ethanol are selected as three different liquids, respectively. Thickness of the liquid film on corrugated plate wall is measured by PLIF (Plane Laser Induced Fluorescence) method. Experimental results show that liquid film rupture is related to the stability parameter Kapitza number. The larger the Kapitza number, the better the liquid film stability and the higher the critical Airflow Velocity.
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Analysis of fluctuation and breakdown characteristics of liquid film on corrugated plate wall
Annals of Nuclear Energy, 2020Co-Authors: Bo Wang, Bowen Chen, Ruifeng TianAbstract:Abstract Corrugated plate dryer is a very vital separation equipment for nuclear engineering and it is meaningful to study the flow, fluctuation and breakdown characteristics of the liquid film on corrugated plate wall. Liquid film thickness of steady flow is measured based on plane laser induced fluorescence (PLIF) technique and time series of liquid film thickness are obtained. Besides, amplitude and frequency domain information of liquid film fluctuations are analyzed by probability density function (PDF), power spectral density (PSD) and wavelet method. A two-dimensional liquid film breakdown model is established. Critical Airflow Velocity when the water film breakdown is measured experimentally. Based on theoretical results, equations for calculating critical Airflow Velocity of the corrugated plate under different liquid film thicknesses are fitted in the form of nike function. Fitting equations for calculating critical Airflow Velocity in the form of nike function agree well with experimental results.
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Study on characteristics of water film breakdown on the corrugated plate wall under the horizontal shear of Airflow
Nuclear Engineering and Design, 2019Co-Authors: Bo Wang, Ruifeng TianAbstract:Abstract The corrugated plate (CP) dryer is a very important component for the steam-water separation in the steam generator because the separation efficiency influences the overall thermal efficiency of a nuclear power plant. Carryover and breakdown phenomena of the water film at the corner of the CP have a great impact on the steam-water separation effect. The study of the complicated steam-water separation mechanism is beneficial to improving its efficiency. Breakdown and flow characteristics under horizontal shear of water film falling down from the vertical CP is studied. Water and air are used as the two phases in the study. This paper derives and validates a model for calculating the critical Airflow Velocity of water film breakdown at the corner of the CP. On the basis of the hydrodynamics theory and applying the image processing method, the relationship between water film thickness and critical Airflow Velocity of water film breakdown is investigated through an experiment. Additionally, the water film thickness is measured with the application of the Charge Coupled Device (CCD) high-speed camera acquisition system. The Planar Laser Induced Fluorescence (PLIF) method is applied for the water thickness measurement in the experiment. Results reveal that the critical Airflow Velocity of water film breakdown is related to the CP structural parameters, properties of the two phases and water film thickness. Comparison of the experimental result and the result calculated by the model is performed as well. The results calculated by the developed model are in good agreement with the obtained experimental results as the water film thickness is large in a certain range. The results show that the critical Airflow Velocity of water film breakdown and the water film thickness are negatively correlated. In order to analyze the factors contributing to the critical Airflow Velocity of water film breakdown, three novel parameters are introduced firstly. In particular, the results reveal that a larger value of parameters is better to the increase of the critical Airflow Velocity of water film breakdown. And when the flexural angle of the CP corner is approximately 27 degrees, the steam-water separation performs best. It recommends that the flexural angle of the CP corner should not exceed 43.2 degrees.
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Investigation on Flow and Breakdown Characteristics Under Horizontal Shear of Water Film Falling Down Vertical Corrugated Plate Dryer
Volume 6A: Thermal-Hydraulics and Safety Analyses, 2018Co-Authors: Bo Wang, Ruifeng Tian, Chen Bowen, Mao FengAbstract:The corrugated plate dryer is a very important equipment for the steam-water separation in the steam generator. Its separation efficiency determines the economic indicators of nuclear power plants. The study of the complicated steam-water separation mechanism of the corrugated plate dryer is very helpful to improve its separation efficiency. Flow and breakdown characteristics under horizontal shear of water film falling down vertical corrugated plate dryer is investigated. Air and water are used as the two phases in the research. This paper also derives a model calculating the critical Airflow Velocity of water film breakdown and completes the comparison of the experimental result and the result calculated by the model. The relationship between the water film thickness and critical Airflow Velocity of water film breakdown is investigated through the experiment. In addition, the water film thickness is measured according to CCD high-speed camera acquisition system and the Planar Laser Induced Fluorescence (PLIF) method is also used for the measurement. The experimental result reveals that the critical Airflow Velocity of water film breakdown is related to the corrugated plate structural parameters, the properties of the two phases and the water film thickness. The critical Airflow Velocity of water film breakdown and the water film thickness are negatively correlated. The result calculated by the model is in good agreement with the experimental result as the water film thickness is large in a certain range.
Jennifer R. Verkouteren - One of the best experts on this subject based on the ideXlab platform.
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Aerosol Collection Efficiency of a Graded Metal-Fiber Filter at High Airflow Velocity (10 m s–1)
Aerosol Science and Technology, 2011Co-Authors: George A. Klouda, Robert A. Fletcher, J. Greg Gillen, Jennifer R. VerkouterenAbstract:A non-woven graded metal-fiber filter was characterized for its collection efficiency as a function of particle size at an Airflow Velocity of 10 m s −1 . Efficiencies were determined by generating a monodisperse aerosol of polystyrene latex (PSL) spheres and oleic acid liquid particles of measured concentration with and without the filter present. For PSL spheres ≤0.7 μm, the collection efficiencies follow theoretical single-fiber collision efficiency (Ptak and Jaroszczyk 1990). Above 0.7 μm diameter (Stokes number 0.8), PSL collection efficiency exhibits a general decreasing trend with increasing particle size suggesting particle bounce. Although this trend is consistent with measured single-fiber collection (collision and adhesion) efficiency for Stokes numbers in the range of 0.2 to 22 (Rembor et al. 1999; Ptak and Jaroszczyk 1990), the magnitude of the filter efficiency is less. For 1 μm to 4 μm PSL, the average collection efficiency is 0.43 (expanded uncertainty (U) of 0.08, n = 6). In the case of p...
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aerosol collection efficiency of a graded metal fiber filter at high Airflow Velocity 10 m s 1
Aerosol Science and Technology, 2011Co-Authors: George A. Klouda, Robert A. Fletcher, Greg J Gillen, Jennifer R. VerkouterenAbstract:A non-woven graded metal-fiber filter was characterized for its collection efficiency as a function of particle size at an Airflow Velocity of 10 m s −1 . Efficiencies were determined by generating a monodisperse aerosol of polystyrene latex (PSL) spheres and oleic acid liquid particles of measured concentration with and without the filter present. For PSL spheres ≤0.7 μm, the collection efficiencies follow theoretical single-fiber collision efficiency (Ptak and Jaroszczyk 1990). Above 0.7 μm diameter (Stokes number 0.8), PSL collection efficiency exhibits a general decreasing trend with increasing particle size suggesting particle bounce. Although this trend is consistent with measured single-fiber collection (collision and adhesion) efficiency for Stokes numbers in the range of 0.2 to 22 (Rembor et al. 1999; Ptak and Jaroszczyk 1990), the magnitude of the filter efficiency is less. For 1 μm to 4 μm PSL, the average collection efficiency is 0.43 (expanded uncertainty (U) of 0.08, n = 6). In the case of p...
