压气机端壁自适应流通延迟失速的数值分析

Numerical investigation of the flow mechanisms of compressor stall delay through end wall self recirculation

关键词:  轴流压气机  自适应流通+  失速  流场  数值仿真

Key words:  Axial compressor  Self recirculation  Stall  Flow field  Numerical simulation

摘要:

端壁自适应流通方式是轴流压气机主动控制失速方法的有效措施之一,即在机匣上结合喷气与引气的方式来延迟压气机的失速,其特点是自适应流通的喷气或吹气量将随压气机的工况自我调整。采用数值模拟方法研究了端壁自适应流通方式对某轴流压气机气动性能的影响,数值计算结果表明,端壁自适应流通方式能有效地延迟失速并略微提高压气机的效率,通过详细地分析端壁自适应流通方式对压气机顶部区域流场结构的影响,揭示了其改善压气机性能的机理。

Abstract:

End wall self recirculation is known as an active method to control stall in axial compressors.It is implemented by combining injection and bleed on the compressor shroud and has the characteristic of injection or bleed quantity self adjusting with the compressor work point varying.Effect of end wall self recirculation on the performance of an axial-flow rotor was performed with the help of numerical method.The numerical results show that end wall self recirculation method can not only suspend the stall effectively but also improve the compressor efficiency appreciably.The fundamental flow mechanism of end wall self recirculation reforming the compressor performance was obtained by detailed analyzing the flow fieid at the blade tip.