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Numerical simulation and a hybrid method of supersonic turbulent base heating

航空动力学报 2018年第10期33卷 2442-2450页

作者： YUAN Junya CAI Guobiao ZHAO Lu School of Astronautics Beijing University of Aeronautics and Astronautics Beiiing 100191 China

Detached eddy simulation(DES)model was used to better capture large vortex structure and unsteady flow feature near cone base.Good base heating results were achieved using proper grid and numerical method.The influence of inflow conditions(like Mach number,Reynolds number)and configuration(bluntness ratio of the cone)on base heating was discussed based on numerical computational results.Compared with base heat flux,base pressure can be predicted more accurately by numerical simulation and the time consuming was shorter.A hybrid method combining numerical simulation with experimental correlation was proposed to predict supersonic turbulent base heating.A review of base heating experiment and correlations for slender cone was presented,and a revised correlation was proposed based on the above simulation results.Compared with the experiment data,the maximum error was 24%,agood result for base heating prediction.This proves that the hybrid method using the revised correlation performs well in predicting supersonic turbulent base heating of slender sphere cone and can meet needs of engineering design.

关键词： base heating detached eddy simulation hybrid method experimental correlation slender sphere cone

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HEAT DISCHARGE PERFORMANCE OF CYLINDRICAL PHASE-CHANG HEAT-STORAGE TANK

HEAT DISCHARGE PERFORMANCE OF CYLINDRICAL PHASE-CHANG HEAT-S...

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国际能源转换及利用学术会议

作者： Chen Ying Deng Xianhe Research Institute of Chemical Engineering South China University of Technology Guangzhou, Guangdong P. R. China Ding Xiaojiang CHIGO Air Conditioning Co.Ltd Nanhai, Guangdong P. R. China

This paper deals with heat transfer in the solidification process of phase-change materials round a heat exchanger with horizontal pipes connected by U-bends. From the early studies, a new experimental apparatus was proposed after its heat transfer process was analyzed, Also, heat discharge experiments were conducted and their results were investigated and discussed. In comparison with bare pipes, experiments of axial finned pipes were finished. Certainly, fins quicken the rate of discharge heat considerably. In the end, an experimental correlation among Rayleigh number, Prandtl number, dimensionless time, dimensionless temperature and discharged heat energy was founded.

关键词： phase-change heat-storage heat discharge finned pipes experimental correlation

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On a General Constitutive Model for Fibrous Laminates

On a General Constitutive Model for Fibrous Laminates

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第十三届国际复合材料会议

作者： Zheng-Ming HuangPolymer & Textile Composites Laboratory Department of Mechanical Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 1 192670.

＜正＞Results from both theoretical and experimental investigations on laminated epoxy composites reinforced with plain weft knitted carbon fiber fabrics of different arrangements subjected to fatigue loads are presented in this paper. The stacking sequences used are [0/0/0/0], [0/45/-45/0], [90/90/90/90], [0/90/90/0], and [90/45/-45/90] where 0 refers to the fabric wale direction and 90 to the course direction. Tensile fatigue with stress control was applied to the laminates as well as to the monolithic matrix material, with a stress ralio of R=0.1 and a

关键词： laminated composites knitted fabric composites fatigue strength. S-N curve life prediction micromechanics bridging model experimental correlation

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