间隙流动特征对压气机转子失速起始的影响

ROLE OF LEAKAGE VORTEX BEHAVIOR ON STALL INCEPTION IN AN AXIAL COMPRESSOR ROTOR

针对一小型、高速轴流压气机实验台,采用三维数值方法研究了间隙流动的稳态和非稳态特征。定常数值模拟结果表明,近失速工况下泄漏涡在叶片通道内部发生破碎,涡破碎使得堆积在机匣壁上的低能流体迅速扩散,对来流产生了很大的阻塞效应。时间精确求解结果进一步证实:随着实验台进一步节流,泄漏涡发生了大范围破碎,破碎形成的低速区迅速扩大;在平衡求解极限点上,破碎的泄漏涡开始与叶片吸力面的附面层发生相互作用,导致吸力面边界层中的低能流体也被卷入破碎的泄漏涡,进一步加剧了尖部通道的阻塞。

Steady and time-accurate three dimensional viscous flow calculations are applied to look deep into the steady and unsteady natures of tip leakage flow in a small-scale high-speed axial com- pressor rotor.Steady numerical simulations indicate that the breakdown of tip leakage vortex occurs inside the rotor passage at near stall condition.The vortex breakdown results in the low-energy fluid accumulating on the casing wall spreads out remarkably,which has a large blockage effect on incoming flow.Time-accurate ...