几何参数对叶栅失速流场的影响

利用热膜探针及装有高频响压力传感器的三孔探针,结合动态数据采集和处理系统,测量了孤立转子的失速流场。描述了失速团数目、失速团传播速度和周向范围与叶栅主要几何参数的关系。实验结果表明:增大安装角或减小稠度均使绕叶栅的气流参数沿周向的变化率趋于缓和;失速区与非失速区之间存在着复杂的质量交换,后者证实了失速区边缘处存在穿越流动现象。

EXPERIMENTAL STUDY ON THE STALL FLOW FOR DIFFERENT GEOMETRIC PARAMETERS OF CASCADE

With the help of the hot film probe and a three- hole probe containing fast response transducers in association with a digital data acquisition and processing system, the flow measurements during stall in an isolated rotor are obtained. The relation between the number and speed of stall cells and the circumferential stalled region and the main geometric parameters of cascade is described. The experimental results indicate that firstly, the rate of circumferential variation for aerodynamic parameters of airflow passing the cascade becomes smoother as the stagger is increased or the solidity decreased and secondly, there is complex mass transport between the stalled and unstalled parts of the flow. It is confirmed by the latter that the fluid must cross from one side of the cell to the other in the tangential direction.