叶排间距影响旋转失速流场的实验研究

Influence on Stalled Flow Field of Gap between Rotor and Stator

利用热膜探针和带高频响压力传感器的三孔针,结合一套动态数据采集和处理系统,详细测量了一个有不同叶排间距的单级轴流压气机的旋转失速点特征参数及流场.证实了失速团数目及传播速度与叶排间距的依存关系.利用失速区内气流与转子进行能量交换的概念,解释了失速区内气流的高切向流动.依靠实验结果,讨论了叶排间距对旋转失速流场的影响.

Das et al in 1984[2] studied stalled flow field but did not analyse the effect of gap between rotor and stator on it. The authors in this paper find experimentally that such effect is significant and cannot be disregarded. The authors employ mainly the hot-film and a three-hole probe containing fast response transducers to take measurements of stalled flow field of single-stage compressor for four different values of gap between rotor and stator. The authors' measurements include number of stall cells and stall cell speed. With increasing gap, single cell first becomes 3 cells and then becomes into 2 cells. The stall cell speed in the 2-cell case and 3-cell case are about the same, but it is significant that both are about twice the speed for a single cell. Flow within the stall cell retains a tangential velocity nearly the same as the speed of rotor; the authors offer a new explanation for this phenomenon by utilizing the concept that there is energy exchange between the stalled airflow and the rotor.