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检索条件"机构=1. State Key Laboratory of Multiphase Flow in Power Engineering"

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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 201. International powertrains, Fuels and Lubricants Meeting, FFL 201.

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 1. atm, temperatures from 1.50 to 1.00 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 1. atm, fuel concentration of 1.0%, equivalence ratio of 1.0 and temperature of 1.50K, 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. © 201. SAE Japan.

关键词： Shock tubes

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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 201.

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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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

1.th Asia-Pacific Conference on Combustion, ASPACC 201.

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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Cellular instability of syngas/air mixtures with H2O dilution 10

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

引用

1.th Asia-Pacific Conference on Combustion, ASPACC 201.

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 0.1.. 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 {1., ICOPE 201.

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. © 201. The Japan Society of Mechanical Engineers.

关键词： Drops

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Interfacial stability in vertical swirling annular two-phase flow 16

Interfacial stability in vertical swirling annular two-phase...

引用

1.th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 201.

作者： Liu, Li Bai, Bofeng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9781510811843

The linear stability of liquid film flowing upward the inner surface of vertical cylinder under the action of the swirling gas core flow is investigated taking exactly the centrifugal force and curvature of the cylinder into account. Swirl has been considered by superposing a circular movement on the annular flow. The theoretical model of the stability of interface to small perturbation is established by analyzing the normal force balance condition at the wavy interface. The characteristic equation is solved and the stability criterion is obtained. The stability characteristics of neutral, growing and damped modes are presented showing the influences of swirl intensity, relative motion of gas-liquid flow, and the surface tension force. The modeling results indicate that the swirling of the gas phase stabilizes the film flow while the curvature of the cylinder destabilizes it. For strong swirling annular flow, it is found that there is a small influence of surface tension on the stability of interface because the stabilizing centrifugal force is dominant on this condition. The neutral wavelength is found to be very sensitive to the values of swirl intensity and cylinder radius when gas-liquid relative movement is small. However, when gas flow rate is large enough, there is no significant difference in its value.

关键词： Stability criteria

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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 201.

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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Shock tube and kinetic study of 1.pentene and N-pentane 10

Shock tube and kinetic study of 1-pentene and N-pentane

引用

1.th Asia-Pacific Conference on Combustion, ASPACC 201.

作者： Cheng, Yu Hu, Erjiang Deng, Fuquan Yang, Feiyu Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi China

Ignition delay times of the 1.pentene/O2/Ar mixtures and n-pentane/O2/Ar mixtures were measured behind the reflected shock wave at 1. atm, stoichiometric equivalence ratio, in the temperature range of 1.00 K to 1.80 K. Empirical correlations of the ignition delay time for 1.pentene and n-pentane were obtained through regression analysis. The simulations with the updated natural gas model show well agreement with the experimental data. Both the experimental and simulation results show a crossover in the ignition delay time of these two mixtures. Reaction pathways and sensitivity analysis are conducted to understand the oxidation process of 1.pentene and n-pentane. The chain branching reaction R1.H+O2O+OH) shows a strong promoting effect while the resonantly stablized allyl radical may be responsible for the longer ignition delay time of 1.pentene in the high temperature region.

关键词： Mixtures

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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

1.th Asia-Pacific Conference on Combustion, ASPACC 201.

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 1.50-1.00 K, pressures of 1.2-1. 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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Measurement on Turbulent Premixed Flame Structure of CH4/H2/Air Mixtures with CO2 Dilution

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

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JSAE/SAE 201. International powertrains, Fuels and Lubricants Meeting, FFL 201.

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. © 201. SAE Japan.

关键词： Carbon dioxide

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