Numerical Study on Natural Circulation System under Various Cooling Mediums  

作　　者：Yumei Lv Wei Dai Shupeng Xie Peng Hu Fei He 

机构地区：[1]CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Thermal Science and Energy Engineering,University of Science and Technology of China,Hefei,230027,China [2]Beijing Institute of Astronautical Systems Engineering,Beijing,100076,China

出　　处：《Frontiers in Heat and Mass Transfer》2025年第2期397-420,共24页热量和质量传递前沿(英文)

基　　金：funded by Fei He,National Natural Science Foundation of China(contract no.52376154);Anhui Provincial Natural Science Foundation(contract no.2308085J21).

摘　　要：Aiming at the global design issue of transpiration cooling thermal protection system,a self-driven circulation loop is proposed as the internal coolant flow passage for the transpiration cooling structure to achieve adaptive cooling.To enhance the universality of this internal cooling pipe design and facilitate its application,numerical studies are conducted on this systemwith four commonly used cooling mediums as coolant.Firstly,the accuracy of the numerical method is verified through an established experimental platform.Then,transient numerical simulations are performed on the flow states of different cooling mediums in the new self-circulation system.Based on the numerical result,the flow,phase change,and heat transfer characteristics of different cooling mediums are analyzed.Differences in fluid velocity and latent heat of phase change result in significant variation in heat exchange capacity among different coolingmediums,with the maximumdifference reaching up to 3 times.Besides,faster circulation speed leads to greater heat transfer capacity,with a maximum of 7600 W/m^(2).Consequently,the operating mechanism and cooling laws of the natural circulation system is further investigated,providing a reference for the practical application of this system.

关 键 词：Transpiration cooling natural circulation loop phase change heat transfer capability flow state 

分 类 号：V19[航空宇航科学与技术—人机与环境工程]