多段转弯连接回转通道的换热和压力分布研究  

Heat Transfer and Pressure Drop on Multi-Turn Connected Internal Cooling Channels

作　　者：赵曙[1] 朱惠人[1] 郭涛[1] 张丽[1] 付猛[2] 

机构地区：[1]西北工业大学动力与能源学院,西安710072 [2]中国航空动力机械研究所,湖南株洲412002

出　　处：《西安交通大学学报》2014年第10期131-136,共6页Journal of Xi'an Jiaotong University

基　　金：国家重点基础研究发展计划资助项目(2013CB035702)

摘　　要：为了掌握涡轮叶片内的多段通道连接关系对回转通道壁面换热和沿程压力分布的影响,采用数值模拟方法研究了带肋单通道、回转通道模型的流动特性,通过瞬态液晶实验测量了回转通道壁面换热分布,揭示了多段通道连接关系对回转通道壁面换热的影响机理。实验结果表明:转弯连接使各段通道的速度分布不均;回转通道沿程压力系数逐渐减小;转弯连接使回转通道各段通道的换热分布不对称,沿流向的努赛尔数Nu逐渐减小;沿程展向平均Nu呈多波峰状分布,肋的扰流作用沿流向逐渐减弱,且两肋之间的高换热区沿流向逐渐向肋下游的背风面偏移;肋间区域的平均Nu沿流向逐渐减小;回转通道各段平均Nu随雷诺数的增加而增大,且增加幅度逐渐减小。Numerical simulations for a single channel and muti-turn connected cooling channel model with 90°ribs is conducted to understand the effect of multi-turn connection on heat transfer and pressure coefficient of internal channel in rotor blade. The heat transfer of turned channel is measured by utilizing transient liquid crystal measurement, and the influence mechanism of multi- turn connection in tuning channel is revealed. Experimental results show that the velocity distribution is uneven in each passage due to tuning eddy. Both the pressure coefficient and the Nusset number （Nu） decrease along the flow direction. The Nu distribution is asymmetric in each passage due to turn-connection. The distribution of averaged Nu numbers has a multiple- peak form as a result of secondary flow induced by rib turbulations. The area of high Nu between two continuous ribs is gradually shifted to the rib downstream. The average Nu in each passage gradually increases while the ratio is slowly reduced as the Reynolds number increases.

关 键 词：涡轮叶片 通道连接 压力系数 换热 数值计算 瞬态液晶 

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]