小空间内冲击/气膜复合冷却换热特性试验  

Experimental investigation of the local heat transfer of impinging cooling with outflow film in closed small space

作　　者：毛军逵[1] 郭文[2] 常海萍[1] 徐磊[1] 张镜洋[1] 常国强[1] 

机构地区：[1]南京航空航天大学能源与动力学院,南京210016 [2]中国燃气涡轮研究院涡轮室,成都610500

出　　处：《航空动力学报》2007年第3期352-359,共8页Journal of Aerospace Power

摘　　要：利用相似理论的原理，试验研究了封闭小空间内冲击／气膜复合冷却内表面的换热特性．研究中通过改变冲击RP数（10000-40000）、冲击距离H和冲击孔直径D之比H／D（0．17～2．0），在2种冲击孔和气膜孔间距P和冲击孔直径D之比P／D（0，1）条件下，细致分析冲击RP数、H／D对复合冷却内表面局部换热特性的影响．结果表明，在本文的试验工况中，冲击靶板上的局部Nu数随着冲击Re的增加而不断变大，而Nu数随着H／D的变化规律并非单调．当P／D=0，H／D=2时换热效果达到最佳；P／D=1时，在X／D=±3范围内，小冲击RP数条件下H／D=0．17和H／D=2的换热效果比较接近，大冲击RP数条件下H／D=1和H／D=2的换热效果比较接近．Experiments were carried out to investigate the heat transfer of compound cooling （impinging cooling with outflow film）. Local heat transfer coefficients on inner surface were obtained over a Reynolds number range of 10 000-40 000, nozzle-to-plate spacing H/D range of 0. 17-2.0, the ratio between impinging jet and film hole distance to jet hole diameter P/D range of 0 and 1. Experimental results show that the local heat transfer coefficient was affected by impingement Reynolds number and nozzle-to-plate spacing greatly. Under the parameters in this paper, the local Nu number increased with the impingement Reynolds number. When P/D=0, the maximum Nu number was achieved while H/D=2. When P/D increased to unity, the maximum Nu number was gotten while H/D=2 and 0.17 under lower impingement Reynolds number. And this proper value of HID will change to be 2 and 1 under higher impingement Reynolds number.

关 键 词：航空 航天推进系统 换热 冲击 复合冷却 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程] TK124[动力工程及工程热物理—工程热物理]