陶瓷基复合材料相变发汗冷却实验研究  

Experimental Investigation of Transpiration Cooling With Phase Change on Ceramic Matrix Composites

作　　者：李晓阳[1] 李浩[1] 姜培学[1] 胥蕊娜[1] LI Xiaoyang;LI Hao;JIANG Peixue;XU Ruina(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084)

机构地区：[1]清华大学能源与动力工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2024年第2期506-513,共8页Journal of Engineering Thermophysics

基　　金：国家自然基金委联合基金项目(No.U22B20135)。

摘　　要：采用轻质耐高温陶瓷基复合材料和相变冷却剂分别是发汗冷却的重要发展方向,然而两者相结合的发汗冷却研究相对缺乏。本文在超声速风洞中实验研究了C/C-SiC陶瓷基复合材料的相变发汗冷却过程,分析了复合材料孔隙结构对发汗冷却性能的影响。结果表明,陶瓷基复合材料平板中,非均匀分布的孔隙结构加剧了蒸汽堵塞效应,导致平板存在局部高温且难以随注入率提升而消除;而孔隙结构较为均匀的材料,表面的温度分布均匀性和冷却效率明显提高。与金属烧结多孔材料相比,陶瓷基复合材料渗透率和热导率较低导致相变比例低,发汗冷却效率偏低。未来需要继续对孔隙结构的优化方法进行研究,以进一步提升复合材料相变发汗冷却效率和均匀性。The use of lightweight high-temperature resistant ceramic matrix composites and phase change coolants are two important development directions of transpiration cooling.however,the research on the combination of the two is relatively insufficient.In this paper,the phase change transpiration cooling of C/C-SiC ceramic matrix composites was experimentally studied in a su-personic wind tunnel,and the influence of composites pore structure on the transpiration cooling performance was analyzed.The results show that in ceramic matrix composites plates,the un-even distribution of the pore structure aggravates the vapor-blockage effect,resulting in local high temperature in the plate,which is hardly eliminated with the increase of injection ratio.For ma-terials with relatively uniform pore structure,the cooling efficiency and uniformity are significantly improved.Compared with metal sintered porous materials,ceramic matrix composites have lower permeability and thermal conductivity,resulting in lower phase change ratio and lower cooling ef-ficiency.In the future,it is necessary to continue to study the optimization method of the pore structure to further improve the efficiency and uniformity of phase change transpiration cooling with composites.

关 键 词：发汗冷却 复合材料 相变 超声速 

分 类 号：V11[航空宇航科学与技术—人机与环境工程]