非设计工况下叶栅分离流动的非定常特性

本文针对非设计工况下叶栅的分离流动进行研究。基于任意曲线坐标下的N-S方程,对不同攻角下单排叶栅的流动分离情况进行数值分析。计算结果表明,在零攻角和较小的负攻角情况下,流动基本呈现定常流动的特性。在正攻角情况下,特别是随着正攻角的加大,流动呈现明显的非定常流动特性,如大分离和涡的脱落现象等。

UNSTEADY CHARACTERISTIC OF CASCADE SEPARATION FLOW UNDER OFF-DESIGN CONDITION

This paper focuses on the unsteady characteristic of cascade separation flow under off-design condition. Based on the Navier-Stokes equations expressed with arbitrary curvilinear coordinates, the separation flow under different attack angles was investigated by numerical method. The computed results show that, under the zero attack angle and the less negative attack angle, the flow characteristic is steady basically, but under the positive attack angle, especially with the increasing of the positive attack angle, it is unsteady obviously such as large separation and vortex shedding, etc.