带90°肋和双排出流孔通道换热特性的实验  

Heat transfer investigation of the channels with 90° rib turbulators and double-row bleed holes

作　　者：郭涛[1] 朱惠人[1] 许都纯[1] 

机构地区：[1]西北工业大学动力与能源学院,西安710072

出　　处：《航空动力学报》2010年第10期2249-2254,共6页Journal of Aerospace Power

基　　金：国家重点基础研究发展计划(2007CB707701)

摘　　要：采用瞬态液晶测试技术测量了带90°肋和双排出流孔通道有出流壁面的换热分布,研究了出流孔与肋的相对位置、通道雷诺数和出流比对换热的影响.研究表明:肋间换热分布受肋前壁面气流分离,肋间气流再附着和出流的共同作用影响;出流孔位置的改变不会对气流再附着的位置产生明显影响;出流孔靠近上游肋时,回流区的换热得到改善,再附着区的换热被出流作用加强,换热特性变好;平均换热强化效果随雷诺数增大而减小,随出流比增大呈增大趋势,但增大幅度较小.The detailed heat transfer distributions of the wall with bleed holes in a channel with 90° rib turbulators and double-row bleed holes were measured by using transient liquid crystal technique.The effects of the relative positions of rib turbulators and bleed holes,channel Reynolds numbers and bleed ratios on heat transfer characteristics were studied.The results show that：the heat transfer distributions are affected by the combined effect of the flow separation,reattachment and bleeding;the heat transfer characteristics for the bleed holes near the upstream ribs are best because of the heat transfer improvement in backflow region and heat transfer enhancement in reattachment region by bleed effect.For the case of the bleed holes near the downstream ribs,the heat transfer characteristics turn worse since higher heat transfer regions behind the holes are confined by ribs;the change of bleed hole location do not modify the position of the flow reattachment,but affect the heat transfer distribution and intensity in the region;the average heat transfer enhancement decreases with the growing Reynolds number,and slightly increases with the increase of bleed ratio.

关 键 词：肋 出流 冷却通道 瞬态测试 液晶 

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]