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为了探究影响高负荷风扇的失稳机制,对风扇第二级静子叶根角区气流分离的形成原因进行了研究,分析了不同换算转速对角区的流动状态以及壁角涡形成与发展的影响。研究表明,经过静子叶根前缘的气流逐渐发展形成了壁角涡,而壁角涡的存在促使了静子吸力面角区的气流分离,且随着风扇工况向近失速点移动,更多的角区气流直接参与了壁角涡的形成。在所研究的范围内,换算转速增加会导致壁角涡强度增加、影响范围扩大;在95%~105%换算转速,壁角涡是引起角区气流分离的主要因素,而在85%换算转速,壁角涡已不再是引起角区气流分离和风扇失稳的主要原因。
In order to explore the instability mechanism of high-load fan, the formation of air-flow separation in the second-order stator fan root zone was studied, and the influence of different conversion speed on the flow regime and the formation and development of corner vortex was analyzed. The results show that the gas flow passing through the front of the stator root gradually develops corner vortices, whereas the presence of the corner vortex promotes the separation of the gas flow in the quiescent area of the stator suction surface. As the fan moves toward the stalling point, more The corner flow directly involved in the corner vortex formation. In the range studied, the increase of conversion speed will lead to the increase of corner vortex intensity and the widening of influence range. In 95% -105% conversion speed, corner vortex is the main factor to cause the airflow separation in corner area, while at 85% conversion speed , The corner vortex is no longer the main reason for the separation of air flow in the corner zone and the instability of the fan.