涡轮叶栅端壁区的流动显示  

FLOW VISULIZATION OF ENDWALL AREA IN TURBINE CASCADE

作　　者：董志锐[1] 刘松龄[1] 

机构地区：[1]西北工业大学,西安710072

出　　处：《中国科学基金》1999年第5期296-297,共2页Bulletin of National Natural Science Foundation of China

摘　　要：在大尺寸低速开式叶栅传热风洞中对一种高压涡轮导向叶栅中的流场进行了流动显示实验研究。分别采用线簇和小球浮动法对5个雷诺数下的叶栅端壁区三维流场、叶片表面和端壁表面的流动进行了显示。实验结果表明:涡轮叶栅中有强烈的二次流动,并存在复杂的涡系;三维流动区约占叶栅通道的40％;雷诺数的增大将增强端壁区的三维流动。流场显示图片表明:叶片吸力面靠近端壁有角涡形成与发展,并存在一个三角形区域;流场显示的通道涡大小与流场测量结果吻合。实验结果可用于分析端壁表面和叶片表面换热特性的形成机理。The flow field visualization of a straight HP turbine cascade is conducted in a large-scale low-speed open -loop cascade heat transfer wind tunnel. Three-dimensional flow fields near the endwall of the cascade, the flows over blade surfaces and endwall surface are visualized by using cotton thread and floating small ball. The experimental results show that there are strong secondary flow and a complex series of vortices in turbine cascade. The 3D-flow region occupies 40% flow passage of turbine cascade. The increasing of Re number will strengthen 3D-flow near endwall. The photos of flow visualization show that corner vortex generates and develops near the suction surface of blade/endwall junction, which forms a triangle region. The size of visualized passage vortex agrees well with measurement result. The results of this paper are useful to analyses and explain the heat transfer characteristics of the endwall and blade surfaces.

关 键 词：涡轮 叶栅 叶栅端壁区 端壁区流动 流动显示 

分 类 号：TK14[动力工程及工程热物理—热能工程] TK263.62