摘要
本文对传统单级与多级冲击冷却的流动与换热特性进行了数值研究。结果表明,多级冲击冷却中横流在每一级的冲击腔中都重新开始累积,抑制了横流的发展,有效地降低了横流对下游冲击换热的不利影响。在相同雷诺数工况下,多级冲击结构的冷气用量大幅度节省,两级冲击为综合换热性能带来11%的增强,证明了多级冲击具有显著的热效益。相同冷气流量工况下,多级冲击拥有更高的射流雷诺数,提升了靶面整体的换热效果,两级、三级和四级冲击可分别为靶面带来1.8、2.3和2.6倍的换热强化,但对泵功和射流进口总压要求较高,导致综合换热性能随分级数的增加而降低。
This paper investigated the flow and heat transfer characteristics of traditional singlestage and multi-stage impingement cooling structures using numerical simulation methods.The results show that the crossflow in the multi-stage impingement restarts accumulating in each stage of the impingement chamber,which inhibits the development of the crossflow and effectively reduces the detrimental effect of the crossflow on the downstream heat transfer.Under a same Reynolds number condition,the multi-stage impingement structures save substantially on coolant usage,and the two-stage impingement brings an 11%enhancement to comprehensive heat transfer performance,proving that the multi-stage impingement has a significant thermal benefit.Under a same coolant flow rate condition,the multi-stage impingement structures have higher Reynolds numbers,which improves the overall heat transfer effect of the target surface.The two-stage,three-stage,and fourstage impingement structures can bring 1.8,2.3,and 2.6 times of heat transfer enhancement to the target surface,respectively,but pumping power and total jet inlet pressure are also higher,resulting in a decrease in comprehensive heat transfer performance with an increasing number of stages.
作者
吴航
杨星
刘钊
丰镇平
WU Hang;YANG Xing;LIU Zhao;FENG Zhenping(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment,Xi'an 710049,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2024年第9期2622-2630,共9页
Journal of Engineering Thermophysics
基金
国家科技重大专项(No.2017-III-0003-0027)。
关键词
冲击冷却
多级冲击
换热特性
流动特性
综合换热性能
impingement cooling
multi-stage impingement
heat transfer characteristic
flow characteristic
comprehensive heat transfer performance
