等离子体激励位置对抑制压气机角区分离效果的影响

为了揭示等离子体气动激励对角区分离的作用效果,应用FLUENT软件数值模拟了等离子体激励器对压气机叶栅角区分离的影响.采用等离子体激励器的简化唯象模型,在压气机叶片吸力面和端壁不同位置沿流向施加激励,对总压损失系数、极限流线、不同截面流动情况进行了比较分析.结果表明:吸力面激励对角区分离改善有限,角区未失速时,近分离点前是激励最佳位置,角区失速后,激励位置越靠前效果越好;端壁流向激励能明显减小角区分离损失,分离点至叶片前缘任何位置施加激励效果一样;组合激励同时减小吸力面边界层和端壁边界层损失,使角区分离消失且不受攻角变化影响.

Impact of Plasma Actuating Position on Control of Corner Separation of a Compressor Cascade

To explore the intrinsic mechanism of plasma aerodynamic actuation on corner separation, FLUENT was used to simulate the effect of a plasma actuator on the corner separation of a compressor cascade. The phenomenological model was applied to impose actuation on different positions along with the flow direction both at the suction surface and hub. Total pressure loss coefficient, streamline, flow in different cross sections were comparatively analyzed. The results indicate that suction surface actuation reduces corner separation loss limited, the separation point is at the best actuating point without corner stall while the nearer actuation position is, the more effective is with corner stall. Hub actuation reduces corner separation loss obviously, positions from separation point to blade leading edge does not affect the final results. Combination actuation reduces loss of both suction surface and hub boundary layers to result in corner separation disappear and independence with attack angle