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针对低速单转子轴流压气机,采用节流阀函数进行了突尖型失速过程的数值模拟研究,以叶顶泄漏流周期性非定常波动及其周向传播特性为切入点,以失速过程中典型时刻为例,分析了失速过程中压气机内部流动的发展和演变特征。伴随压气机节流进入突尖型失速的过程,叶顶泄漏流周期性非定常波动频率和周向传播速度减小;当叶顶泄漏流轨迹与叶顶前缘额线平齐时,出现突尖型失速先兆,其流动特征表现为起始于叶片吸力面并延伸至机匣的双旋涡结构;当叶片同时出现尾缘回流和前缘溢出时,标志压气机进入完全发展的突尖型失速状态。
Aiming at the low speed single rotor axial flow compressor, the numerical simulation research on the process of sudden tip type stall is carried out by using the throttle valve function. Taking the periodic unsteady fluctuation and its circumferential propagation of the tip leakage flow as the starting point, Taking the typical moment as an example, the development and evolution of the internal flow in the compressor during stalling are analyzed. With the process of compressor throttling into sudden tip-type stall, the periodic unsteady fluctuation frequency and the circumferential propagation velocity of the tip leakage flow decrease. When the tip leakage flow trajectory is flush with the front edge of the blade tip, Pointed stall precursors whose flow characteristics appear as a double-vortex structure starting from the suction side of the blade and extending to the casing. When both the blade recovers and the leading edge overflows, the flag compressor enters the fully developed sudden-tip-type stall status.