烧结多孔壁面发汗冷却换热的实验研究  

Experimental investigation of the heat transfer for transpiration cooling through a sintered porous plate

作　　者：孟丽燕[1] 姜培学[1] 蒋方帅[1] 余磊[1] 任泽霈[1] 

机构地区：[1]清华大学热能工程系热能动力工程与热科学重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2005年第11期1537-1539,共3页Journal of Tsinghua University(Science and Technology)

基　　金：国家杰出科学基金资助项目(50025617)

摘　　要：为开发有效的热防护技术,分别采用均匀青铜颗粒和不均匀青铜颗粒烧结而成的多孔板作为实验段,对平板发汗冷却进行了实验研究。实验结果表明:发汗冷却能有效地减少壁面和高温流体之间的换热;颗粒直径越小,相同条件下的冷却效果越好,但是需要的压降越大;在相同的压降下,不均匀颗粒多孔板中,直径大的一侧压阻小,相当于增大了注入率,因此壁温下降幅度更大。合适颗粒直径的选择与孔隙率、压降和强度的要求有关。The effect of transpiration cooling on the heat transfer characteristics for flow through a porous plate was experimentally investigated using sintered porous plates made of uniform or non uniform bronze particles with different diameters to develop an effective thermal protection technique. The experimental results show that transpiration cooling significantly reduces the heat transfer between the wall and the high-temperature air and that the pressure drop increases with decreasing particle diameter. In a sintered plate with non-uniform particles, the pressure resistance is smaller on the side with the larger particles, which is equivalent to a larger blowing ratio resulting in a larger wall temperature decrease. The particle diameter selection then depends on the porosity, pressure drops, and plate strength.

关 键 词：传热 发汗冷却 多孔介质 注入率 

分 类 号：TK122[动力工程及工程热物理—工程热物理]