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检索条件"机构=State Key Laboratory of Multiphase Flows in Power Engineering"

共 1597 条记录，以下是1001-1010 订阅

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Dynamics of Internal Jets in the Merging of Two Droplets of Unequal Sizes

Dynamics of Internal Jets in the Merging of Two Droplets of ...

引用

第八届海峡两岸激波与复杂流动学术会

作者： Chenglong Tang Jiaquan Zhao Peng Zhang Chung K.Law Zuohua Huang Department of Mechanical and Aerospace Engineering Princeton University State Key Laboratory of Multiphase Flow and Power Engineering Xi'an Jiaotong University Department of Mechanical Engineering Hong Kong Polytechnic University Center for Combustion Energy Tsinghua University

*** Collision of two droplets in a gaseous environment plays an essential role in many natural and industrial processes,such as raindrop and cloud formation,insecticide spraying,spray painting,and spray combustion in various liquid-fueled *** the most symmetrical event,namely the head-on collision between two identical droplets,it has been experimentally and theoretically-demonstrated that,

关键词： simulation Dynamics of Internal Jets in the Merging of Two Droplets of Unequal Sizes

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Specific Heat Ratio of High Methane Fraction Natural Gas/Air in Confined Vessel

Specific Heat Ratio of High Methane Fraction Natural Gas/Air...

引用

SAE 2015 World Congress and Exhibition

作者： Tang, Chenglong Si, Zhanbo Zhang, Shuang Huang, Zuohua Pan, Shiyi Wang, Jinhua Gong, Jing Xi'An Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an710049 China

The specific heat ratio used in heat release calculation plays an important role and the mass fraction burned is also a crucial parameter in thermodynamics analysis for engine combustion. A research of high methane fraction natural gas was investigated in a constant volume combustion vessel at different initial conditions. Results show that with the increase of the initial pressure, the specific heat ratio is decreased, and the time of the mixture burned up is postponed, while the peak heat release ratio is increased. With the increase of the methane fraction, the parameters have the opposite behavior. With the increase of the initial temperature, the specific heat ratio is decreased, and the time when the mixture is burned up is accelerated, and the peak heat release ratio has no obviously difference. With the increase of the dilution ratio or the CO2/N2 ratio, the specific heat ratio is decreased, and the peak heat release heat ratio is decreased. Meanwhile, the time of mixture burned up is postponed with the increase of dilute ratio or CO2/ N2 ratio. Copyright © 2015 SAE International.

关键词： Specific heat

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Shock-tube measurements and kinetic study of propanal ignition 10

Shock-tube measurements and kinetic study of propanal igniti...

引用

10th Asia-Pacific Conference on Combustion, ASPACC 2015

作者： Yang, Ke Tang, Chenglong Man, Xingjia Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi China

Ignition delay times of propanal were measured in a shock tube over the temperature range of 1050-1800 K, pressures of 1.2-16 atm, fuel concentrations of 0.5-2.0%, and equivalence ratios of 0.5-2.0. Through multiple linear regression, a correlation for the tested ignition delay times was obtained, and the measured data were also compared to the previous data. Two available models (Veloo mech and NUIG mech), were used to simulate the experimental data. Results suggest that both mechanisms has its own advantages and the Veloo mech exhibits a better prediction on the measured data than NUIG mech except for the fuel-rich condition. Reaction pathway analysis indicates that propanal molecule mainly breaks down through the H-abstraction reactions (accounting for around 80% propanal consumption), while reactions of unimolecular decomposition contribute a little part of the whole consumption.

关键词： Shock tubes

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Burning velocity and flamelet structure of turbulent premixed CH4/H2/air flames with CO2 dilution 10

Burning velocity and flamelet structure of turbulent premixe...

引用

10th Asia-Pacific Conference on Combustion, ASPACC 2015

作者： Wang, Jinhua Yu, Senbin Zhang, Meng Jin, Wu Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Turbulent burning velocity and statistical flame front structure parameters of turbulent premixed CH4/H2/air flames diluted with CO2 were measured with OH-PLIF technique. Hydrogen fractions are up to 0.2 and CO2 dilution ratios are up to 0.1. The instantaneous flame front structure was detected using the OH-PLIF technique on a turbulent premixed Bunsen burner. Through image processing and statistic analysis, turbulent burning velocity ST and statistic quantitative parameters, i.e. flame surface density Σ and flame brush thickness δT were obtained. Results show that turbulent burning velocity ST normalized by laminar burning velocity SL decreases with CO2 dilution. Increased Markstein number LM and flame intrinsic instability li with CO2 dilution leads to the passive response of flame to turbulence wrinkling which resulting in less wrinkled flame front, smaller Σ, lower local burning velocity and ST/SL. Convex structure is more frequent than that of concave ones at normal pressure and the bias distribution is much weaker comparing to that of high pressure. The positive structure decreases while the negative structure increases slightly with CO2 dilution. This would be one of the mechanisms leading to the decrease of the effective contact surface between reaction zone and unburned mixture which resulting in the decrease of ST/SL with CO2 dilution.

关键词： Carbon dioxide

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Shock Tube Experimental and Modeling Study of MTHF Ignition Characteristics at High Temperatures

Shock Tube Experimental and Modeling Study of MTHF Ignition ...

引用

JSAE/SAE 2015 International powertrains, Fuels and Lubricants Meeting, FFL 2015

作者： Wang, Jingshan Wang, Xibin Fan, Xiangshan Yang, Kangkang State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an710049 China

High temperature ignition delays of 2-methyltetrahydrofuran(MTHF) were measured behind a reflected shock tube under conditions of pressures from 1.2 to 10 atm, temperatures from 1050 to 1800 K, equivalence ratios from 0.5 to 2.0, and fuel concentrations of 0.25%, 0.5% and 1.0% diluted in argon. Results showed that the ignition delay of MTHF decreases with the increase of pressure, temperature, fuel concentration and increases with equivalence ratio. The trend is less notable at higher fuel concentrations and equivalence ratios. Based on sensitivity and pathway analysis at pressure of 10 atm, fuel concentration of 1.0%, equivalence ratio of 1.0 and temperature of 1550K, it was found that the most sensitive reaction of MTHF at high temperature is H+O2=O+OH, and the main consumption way is fuel decomposition instead of H-abstraction. Finally, ignition delays of MTHF were compared with THF both on experimental and kinetic analyses, and MTHF has lower ignition delays than THF. To our knowledge, it is the first time to present the ignition delays of MTHF under these conditions. © 2015 SAE Japan.

关键词： Shock tubes

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Numerical modeling of heat transfer in a two-phase closed thermosyphon 24

Numerical modeling of heat transfer in a two-phase closed th...

引用

24th IIR International Congress of Refrigeration, ICR 2015

作者： Cao, Jing Li, Mei Li, Bowen Hou, Yu Zhang, Xingqun State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9782362150128

Heat pipe technology is widely applied in the heat transfer systems of many equipment. Two-phase closed thermosyphon (TPCT) is one of the heat pipes which could work with the help of natural gravity. TPCT is adopted in many occasions, such as the waste heat recovery system, the ground source heat pumps, the preservation of permafrost and the de-icing of roadways. In this paper, a comprehensive numerical model is established to describe the condensation and evaporation of thermosyphon. The volume of fluid (VOF) model is employed to describe the interface between vapor and liquid phases. The predicted temperature distribution on the thermosyphon wall agreed well with the published experimental data in the trend.

关键词： Thermosyphons

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Cellular instability of syngas/air mixtures with H2O dilution 10

Cellular instability of syngas/air mixtures with H2O dilutio...

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10th Asia-Pacific Conference on Combustion, ASPACC 2015

作者： Xie, Yongliang Wang, Jinhua Cai, Xiao Nie, Yaohui Peng, Cheng Yu, Qianqian Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

A study on effects of CO/H2 ratio, H2O dilution and pressures on the cellular structure of moist syngas flame was conducted using spherically expanding flames. Experimental conditions for the CO/H2/H2O/air mixtures are the pressures from 0.1 to 0.3 MPa, initial temperature of 373K and H2O dilution ratios are from 0 to 0.15. Results show cellular instability is promoted at atmospheric pressure and suppressed at elevated pressure when H2O is added into the mixture. In addition, critical radius increases with the increase of H2O dilution ratio for the mixture with CO/H2 ratio of 50/50 and changes little when CO/H2 ratio is 20/80. Critical Peclet number decreases with the addition of H2O and increases with the decrease of CO/H2 ratio.

关键词： Dilution

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Modelling of control system and efficiency analysis for a 600MW supercritical lignite-fired boiler

Modelling of control system and efficiency analysis for a 60...

引用

International Conference on power engineering, ICOPE 2015

作者： Wang, Bingqi Han, Xiaoqu Mu, Qiwei Zhou, Yan Chen, Weixiong Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

In this paper, the control system of a 600MW supercritical lignite-fired boiler was modeled and coupled with boiler thermal system through GSE simulation software. Simulation experiments were conducted under load decrease condition and load rise condition in order to test control effect and analyze efficiency change in the dynamic mode. Simulation results show that the applied control strategies and established control model are reliable and effective. From BMCR condition to THA condition, boiler efficiency falls from 92.08% to 91.71%, then slowly increases to 92.02%. From THA condition to 75%THA condition, boiler efficiency drops from 92.02% to 91.42%, then slowly rises to 91.90%. From 75%THA condition to 45%BMCR condition, boiler efficiency slumps from 91.90% to 91.37%, then gradually ascends to 91.76%. From THA condition to BMCR condition, boiler efficiency rises from 92.02% to 92.30%, then slowly decreases to 92.08%. From 75%THA condition to THA condition, boiler efficiency soars from 91.87% to 92.41%, then slowly falls to 92.02%. From 45%BMCR condition to 75%THA condition, boiler efficiency ascends from 91.76% to 92.24%, then gradually drops to 91.87%. Load rise condition undertakes lower energy losses than load decrease condition. © 2015 The Japan Society of Mechanical Engineers.

关键词： Drops

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Investigation on the matching performance of a small cryogenic air turboexpander 24

Investigation on the matching performance of a small cryogen...

引用

24th IIR International Congress of Refrigeration, ICR 2015

作者： Yang, Shanju Li, Bowen Liu, Guoqing Hou, Yu Chen, Shuangtao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9782362150128

The matching performance of a turboexpander is essential for a small reverse Brayton air refrigerator, especially when it works under varied operation parameters. Generally, an appropriate brake pressure is required when the turboexpander works under different operation parameters. In this paper, the matching performance of a turboexpander supported by a bump journal foil bearing and a pressurized thrust gas bearing is studied. A centrifugal blower is used as a brake. The performance curve is analyzed through a numerical simulation using CFX. The matching calculations were carried out with different brake blowers under both room temperature and low temperature. A brake pressure feedback control is applied in the experimental study. A thermal performance of the refrigerator is tested. The results indicated that the appropriate brake blower and brake pressure facilitate the system thermal performance under both room and low temperature. The simulation agrees well with the experimental results.

关键词： Temperature

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Measurement on Turbulent Premixed Flame Structure of CH4/H2/Air Mixtures with CO2 Dilution

Measurement on Turbulent Premixed Flame Structure of CH4/H2/...

引用

JSAE/SAE 2015 International powertrains, Fuels and Lubricants Meeting, FFL 2015

作者： Wang, Jinhua Yu, Senbin Nie, Yaohui Jin, Wu Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an710049 China

Measurement on turbulent premixed CH4/H2/air flames was studied experimentally. Hydrogen blending ratio is defined as the ratio of hydrogen to fuel, while CO2 dilution ratio is defined as the mole fraction of CO2 to those of mixture. Hydrogen blending ratios up to 0.2 and CO2 dilution ratios up to 0.1 were studied. OH profile of the instantaneous flame front was detected using the OH-PLIF visualizations on a turbulent Bunsen burner. 500 OH-PLIF images were used to obtain the turbulent burning velocity and calculate flame surface density, and 280 images was used to calculate the local curvature radius. © 2015 SAE Japan.

关键词： Carbon dioxide

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