短扰流柱排端壁的平均换热实验  

Experiments on heat transfer in trapezoidal channel with short pin-fin arrays

作　　者：张丽[1] 朱惠人[1] 刘松龄[1] 王学文[1] 

机构地区：[1]西北工业大学动力与能源学院,陕西西安710072

出　　处：《推进技术》2008年第5期523-526,556,共5页Journal of Propulsion Technology

基　　金：APTD项目(APTD-1203-02-03)

摘　　要：为了深入了解涡轮叶片尾缘扰流柱区域的端壁换热情况,针对梯形通道高稠度短扰流柱排,沿着弦向和径向都有出流或只沿径向出流的情况,通过实验测量了端壁换热分布,研究了弦向出流比(0.25～1)和弦向出流雷诺数(3×104～9×104)对端壁换热的影响。实验结果表明:(1)端壁平均努塞尔数随着雷诺数增加而增加,随着出流比的增加先下降,出流比从0.75到1平均努塞尔数又略增加。(2)不同出流比情况下,沿着弦向和径向努塞尔数的变化具有不同的规律。An experiments study has been performed to investigate the heat transfer characteristics in trapezoidal chan- nel with small spacing short pin-fin arrays. The effects of ratio of lateral-to-total flow rate （0. 25≤ c≤ 1 ） and flow Reynolds number （3×10^4 ≤Rec≤ 9× 10^4 ） have been investigated. It is found that endwall averaged Nusselt number decreases with increasing ejection ratio c firstly, and then increases with increasing c as c 〉 0.75. The results also show that Nusseh number distribution along chord-wise and span-wise directions is strongly dependent on the ejection ratio over the range of Reynolds number studied.

关 键 词：涡轮叶片 扰流柱 换热 实验 

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]