高旋转数下直肋U型方通道的换热特性研究  

Heat Transfer in a Rotating Square U-Duct at High Rotation Numbers with 90° Ribs

作　　者：冯晓星 田淑青 邓宏武[2] 李洋[2] 

机构地区：[1]中航商用航空发动机有限责任公司设计研发中心,上海201108 [2]北京航空航天大学航空发动机气动热力国家级重点实验室,北京100191

出　　处：《推进技术》2016年第3期428-435,共8页Journal of Propulsion Technology

摘　　要：通过提高U型通道气体压力到500k Pa以上,将实验雷诺数Re和旋转数Ro范围分别扩展到10000~70000和0~2.0,从而匹配真实发动机转子叶片的工作条件。在此基础上实验研究了高旋转数下带直肋的、方形截面的U型通道的换热特性。研究结果表明：第一通道前缘面的努塞尔数比随旋转数的增大先下降后增强,该临界旋转数为定值Roc=0.26;随着旋转数的增大,第二通道前缘面的努塞尔数比一直高于后缘面,与光滑通道中的换热规律不同;随着旋转数的增大,第二通道内外侧面努塞尔数比的差异逐渐减小,在临近出口处几乎没有差异,与光滑通道相比正好相反。To match the real engine operating condition,Reynolds and Rotation number range of current experiment are expanded from 10000 to 70000 and 0 to 2.0 through increasing the absolute pressure of the air in the U- duct to 500 k Pa. Experiments have been conducted to investigate the heat transfer characteristics in a square U-duct with 90° ribs. The results indicate that Nusselt number ratio of leading wall in the first passage firstly decreases and then increases as the rotation number increasing,and the critical rotation number is constant,Roc=0.26. In the second passage,Nusselt number ratio of leading wall behaves constantly better than trailing wall with the increasing of the rotation number,which is totally different from that of the smooth channel.And contrary to the difference of Nusselt number ratio between inner and outer wall in the second passage of the smooth channel,it becomes smaller along the second passage of U-duct with 90° ribs.

关 键 词：雷诺数 高旋转数 直肋 U型通道 换热特性 

分 类 号：V235.1[航空宇航科学与技术—航空宇航推进理论与工程]