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2009 ANS Annual Meeting and Embedded Topical Meeting: Nuclear and Emerging Technologies for Space, NETS 2009

作者： Zhang, Dalin Rineiski, Andrei Qiu, Suizheng State Key Laboratory Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi'an Jiaotong University 28 West Xian ning Road Xi'an 710049 China Institute for Nuclear and Energy Technologies Forschungszentrum Karlsruhe Hermann-von-Helmholtz-Platz 1 Eggenstein-Leopoldshafen D-76344 Germany

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Experimental study on the performance of an aircraft environmental control system

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Applied Thermal engineering 2009年第16期29卷 3284-3288页

作者： Hongli Zhao Yu Hou Yongfeng Zhu Liang Chen Shuangtao Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 PR China The First Aircraft Institute of AVIC1 Xi’an 710089 PR China

In this paper, the experimental study on the off-design performance and dynamic response of an aircraft environmental control system (ECS) was presented. A bootstrap air cycle refrigeration system with high-pressure water separation was employed in the ECS. Both the static test and the dynamic test were conducted on the ECS. The performance of the key components including precooler, recuperator, compressor, and turbine was investigated. The test results show the performance of the tested ECS can meet the requirements of design. However, some parameters including outlet pressure, turbine efficiency, and rotational speed might vary obviously when the operation conditions changed. The outlet humidity ratio and outlet temperature might also fluctuate largely during the start-up process. It is necessary to take into account the off-design performance and the transient performance in the design of ECS.

关键词： Environmental control system Off-design performance Dynamic response Brayton cycle

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Prediction of transition boiling concerning downward facing horizontal surface in confined space using artificial neural network

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Yuanzineng Kexue Jishu/Atomic Energy Science and Technology 2009年第7期43卷 616-621页

作者： Zhao, Da-Wei Su, Guang-Hui Tian, Wen-Xi Qiu, Sui-Zheng Sugiyama, K. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an 710049 China Faculty of Engineering Hokkaido University Kita 13 Jo Nishi 8 Chome Kita-Ku Sapporo 060-8628 Japan

An artificial neural network (ANN) for predicting Nusselt number was trained successfully based on the data of transition boiling experiment, which was conducted in confined space with downward facing surface at atmospheric pressure. The effects of wall superheat, Δtw, the ratio of the gap size to the diameter of heated surface, δ/D, Prandtl number and Rayleigh number on Nusselt number under transition boiling condition were analyzed based on the trained ANN. A correlation used to accurately predict the natural convection heat transfer under the present condition was obtained and it provides a reasonable agreement against the experimental data.

关键词： Facings

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Piv measurement of turbulent mixing layer flow with polymer additives

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2009年第4期30卷 608-610页

作者： Ning, Tao Guo, Fu-De Chen, Bin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Turbulent mixing layer flow with 200 mg/kg polymer additives was measured by PIV and compared with pure water cause. The velocity ratio between high and low speed is 4:1 and the velocity difference ranges from 0.25 m/s to 1.25 m/s. It is showed that large vortex structures exist in flow field with/without polymer addictives, but the coherent structure is much clearer and the large eddy will roll up earlier when polymer is added. Similar with pure water case, the Reynolds stress is decreasing and the vorticity is increasing with increasing the velocity difference. However, the width and range of Reynolds shear stress and vorticity are wider and larger.

关键词： Turbulent flow

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Application of opposed water spray cooling in an high-temperature entrained-flow coal gasifier

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2009年第6期30卷 984-986页

作者： Liu, Pei-Yao Chen, Qiu-Yang Zeng, Min Wang, Qiu-Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

A series of chemical reactions happen in the coal gasifier and as a result, high temperature syngas is obtained which contains a lot of solid granules. The high-temperature syngas must be cooled, because it can not be utilized directly. The opposed water spray cooling is not only effective, but also could dedust the syngas. In the present study, the CFD technique is used to investigate the effect of the opposed spray cooling in a gasifier. The Euler-Lagrange method is applied to deal with the syngas and the water droplets respectively. A non-dimensional parameter Temperature Non-uniform Factor (TNF) is defined to confirm the height of the cooling section. The simulated results match the designed data well. If water droplets with small diameters are used, the single-stage water spray cooling is more economic than the two-stage water spray cooling.

关键词： Computational fluid dynamics

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Research on surface damage of solid material subjected to high speed liquid impact

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Binggong Xuebao/Acta Armamentarii 2009年第SUPPL. 2期30卷 139-144页

作者： Xie, Yong-Hui Wang, Yong Chen, Jian-Hui Zhang, Di State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi Xi'an 710049 China

In order to study the surface damage of solid material subjected to the high speed liquid impact, both numerical and experimental methods were established. The smoothed particle hydrodynamics and finite element analysis were used to calculate the material damage. The conditions of PMMA and steel were analyzed to obtain the dynamic stress and strain distribution during impact. An experiment apparatus was build. The velocity of the impact jet was measured using a high speed camera and the apparatus. A digital microscope was used to measure the three dimensional profile of the sample before and after high speed liquid impact up to 600 m/s. The dimensions of damage area were recorded and analyzed statistically. Based on the statistical results, the performance of the materials resisting liquid corrosion was evaluated.

关键词： High speed cameras

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Optimal heat transfer criterion and inclination angle effects on non-boiling regime spray cooling

Optimal heat transfer criterion and inclination angle effect...

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IEEE Symposium on Semiconductor Thermal Measurement and Management (SEMI-THERM)

作者： Yong-xian Guo Zhi-fu Zhou Jian-yuan Jia Shao-rong Zhou School of Mechano-Electronic Engineering Xidian University Xi'an Shaanxi China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi China Intel Asia-Pacific Research and Development Limited Shanghai China

Based on the maximum CHF (critical heat flux) criterion, an optimal heat transfer criterion, which is called H criterion, was proposed. Experimental apparatuses were conducted. Distilled water was used as the working fluid. Three different DANFOSS nozzles with cone angles being 54deg, 50deg and 54deg respectively were used to cool a 30times30 mm 2 square copper surface. Experimental results indicated that the volumetric fluxes were pro-portioned to P 0.5 , where P is the pressure drop across the nozzles. The optimal distance between the nozzles and the heated surface were derived. The results indicated that the optimal heat transfer appeared while the outside of the impellent thin spray film inscribed in the square heated surface. Based on the H criterion aforementioned, two DANFOSS nozzles of the three were used to study the temperature distribution of the heated surface experimentally while there were spray inclination angles. Distilled water was also used impacting on the 30times30 mm 2 square copper surface aforementioned and a circular heated copper surface with diameters being 30 mm respectively. The heat flux of the surface was kept in constant (about 26-35 W/cm 2 ). The inclination angles were 0deg, 10deg, 20deg, 30deg, 40deg and 50deg respectively. Experimental results indicated that the grads of the temperature of the surface increases first and then decreases with the increase of the inclination angle.

关键词： Heat transfer Spraying Temperature Electronics cooling Coolants Heat engines Copper Uncertainty Water heating Space exploration

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Clogging failure in microfilter for blood cell separation and its novel improvements

Clogging failure in microfilter for blood cell separation an...

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International Symposium on Physical & Failure Analysis of Integrated Circuits

作者： Tao Dong Zhaochu Yang Eirik Bentzen Egeland Frank Karlsen Henrik Jakobsen Norwegian Center of Expertise on Micro-and Nanotechnology I.M.S.T. /R. I Vestfold University College Norway State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

Clogging failure is common for microfilter utilizing the flat membrane structure. To reduce clogging failure in microfilters, the turbine blade-like micropillar is introduced in microfilter design. Two improved cross-flow microfilter designs employing the blade-like micropillar barrier are presented, one with varied cross-section channels, and the other with Archimedes' spiral channels. Analogy experimental-data based simulations show that the two aforementioned novel microfilters have good filtrating efficiency and fantastic anti-clogging characteristics. And the commercial value of the turbine blade-like barriers is affirmed by the industry Partners.

关键词： Microfiltration Cells (biology) Filters Biomembranes Filtration Turbines White blood cells Nanotechnology Educational institutions power engineering

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Online recognition of the multiphase flow regime

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Science China(Technological Sciences) 2008年第8期51卷 1186-1194页

作者： BAI BoFeng ZHANG ShaoJun ZHAO Liang ZHANG XiMin GUO LieJin State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

The key reasons that the present method cannot be used to solve the industrial multi- phase flow pattern recognition are clarified firstly. The prerequisite to realize the online recognition is proposed and recognition rules for partial flow pattern are obtained based on the massive experimental data. The standard templates for every flow regime feature are calculated with self-organization cluster algorithm. The multi-sensor data fusion method is proposed to realize the online recognition of multiphase flow regime with the pressure and differential pressure signals, which overcomes the severe influence of fluid flow velocity and the oil fraction on the recognition. The online recognition method is tested in the practice, which has less than 10 percent measurement error. The method takes advantages of high confidence, good fault tolerance and less requirement of single sensor performance.

关键词： multiphase flow flow regime online recognition multi-sensor data fusion

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Effects of velocity ratio on turbulent mixing layer at high Reynolds number

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Journal of Physics: Conference Series 2009年第1期147卷

作者： Fude Guo Bin Chen Liejin Guo Ximin Zhang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

In this paper the effect of velocity ratio on plane mixing layer was experimentally investigated by Particle Image Velocimetry (PIV). The velocity ratio between low and high speed side are 0.25 and 0.50, respectively. The Reynolds number based on the velocity difference of two streams and hydraulic diameter of the channel is 66000. The results indicate that the maximum mean Reynolds stress on the same cross section is decreasing with the velocity ratio increasing. The maximum dimensionless mean vorticity is decreasing according to an exponential law along the stream-wise direction and the decreasing speed of dimensionless mean maximum vorticity is increasing with the velocity ratio increasing. The dimensionless vorticity caused by plate wake is decreasing sharply in a very short distance along the down stream wise direction and the decreasing speed is faster when the velocity ratio is larger.

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