火箭推进2023，Vol.49Issue(6)：63-72,10.
预冷发动机氢氦PCHE通道换热与热应力数值分析
Numerical analysis of heat transfer and thermal stress in the hydrogen-helium PCHE channel of precooled engine
摘要
Abstract
Based on the application of printed circuit heat exchanger(PCHE)in the closed helium Brayton cycle of hypersonic precooled engine,the thermal-solid coupling characteristics of hydrogen-heli-um PCHE channel were numerically studied,and the effect mechanisms of hot-side helium parameters on heat transfer were emphatically expounded.The variation characteristics of hot-side wall temperature and heat transfer coefficient and the effect on cold-side heat transfer were investigated.The distributions of temperature and turbulent kinetic energy in channel cross-section were analyzed.The performance of PCHE channel was evaluated by the entropy generation and the comprehensive heat transfer coefficient,the thermal stress of channel was analyzed,and the heat transfer correlations of hot-side and cold-side were established(error within±15％).The results show that the hot-side pressure has only a weak effect on the heat transfer.The heat transfer of hot-side and cold-side is enhanced with the increase of hot-side mass flux.The decrease of hot-side inlet temperature causes the weakened heat transfer both of the hot-side and the cold-side.The increase of hot-side inlet temperature leads to the significant increase of chan-nel entropy generation,and the increase of hot-side mass flux results in a significant decrease of entropy generation.High thermal stress occurs between the hot and cold flow channels and the side-walls,the maximum local thermal stress reaches 25 MPa.关键词
氢氦换热器/超临界压力/换热/热应力/熵产Key words
hydrogen-helium heat exchanger/supercritical pressure/heat transfer/thermal stress/en-tropy generation分类
航空航天引用本文复制引用
王彦红,李雨健,贾玉婷,李洪伟..预冷发动机氢氦PCHE通道换热与热应力数值分析[J].火箭推进,2023,49(6):63-72,10.基金项目
国家自然科学基金(52106196) （52106196）
吉林省教育厅科技项目(JJKH20220100KJ) （JJKH20220100KJ）
