摘要
为了研究带有冷却气流的涡轮叶冠间隙流场流动特性,采用粒子图像测速仪(PIV)技术得到了叶冠间隙流场中各个典型截面的瞬时流场显示,并对叶冠间隙流场特性进行了研究.研究发现:由于叶冠腔内有两股叶尖冷却气流的注入,叶尖泄漏流流过叶冠间隙时会与两股冷却流相互掺混,从而使腔内气流的流动状态变得非常复杂,因此在叶冠突肩之后以及叶冠腔内流体汇合处会有大小方向各异的涡流产生.同时,两股冷却气流均对泄漏流有一定的阻挡作用,前孔冷却流的阻挡作用更为明显.随前孔与后孔岀流比增加,前孔流及后孔流对泄露流的阻挡作用增强.
In order to study flow characteristics of tip clearance flow in turbine shroud, a cooling experimental system was designed, and the instantaneous flow field of each typical section was received by particle image velocimetry （PIV）. Then the flow field characteristics of tip clearance flow were studied. The result shows： two cooling flows of the turbine shroud cavity mixing with tip leakage flow makes the flow state in shroud cavity very com- plex. Therefore, vortex flows with different functions and sizes are generated at different positions in shroud cavity. Meanwhile, both the two cooling airflows have blocking effect on the leakage flow, and the effect from the former hole is more obvious.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2012年第8期1848-1854,共7页
Journal of Aerospace Power
