关键词: 扩压叶栅;等离子体;耗散函数;损失分析

Abstract: The mechanism of plasma effect was investigated on a highly-turning compressor cascade by discussing the entropy and dissipation function.The results show that the separation zone is merely an accumulation area for low-energy fluid with large total pressure loss and entropy rather than a zone of losses source.The mechanisms of the plasma effect on the flow field are inferred to include reducing the pressure upstream the plasma region by inducing acceleration,generating a local favorable pressure gradient within the plasma region and increasing the flow velocity near the electrodes.Moreover the plasma can weaken the shear strength and reduce the strong shear zone in the region between the separation and mainstream by increasing the velocity and minishing the separation area,which is the essence of plasma effect on reducing the cascade losses.It is also found that the wake loss are reduced and the friction loss near the electrode are enhanced,which are caused by the increase of the velocity.

Key words: Compressor cascade;Plasma;Dissipation function;Loss mechanism