典型布局端壁等离子体激励抑制高负荷扩压叶栅角区分离实验

为提高端壁等离子体气动激励对高负荷压气机扩压叶栅角区流动分离的控制能力,需要进一步优化激励布局,实现更高效的流动控制。针对多种端壁等离子体激励布局形式,分别开展了毫秒脉冲等离子体气动激励抑制叶栅角区流动分离的实验研究。结果表明:端壁横向流动对角区流动分离的影响大于流向附面层的流动分离。端壁激励布局对流动控制效果至关重要。优化后的激励布局沿三维角区端壁分离线切向,流动控制效果最好,50%叶高处总压损失减小11.8%;但随着来流攻角的变化,导致激励器布置不再与端壁分离线相切,流动控制效果减弱,因此要根据控制攻角的范围需求,结合具体的流场结构,设计合适的激励布局;适当的增加激励组数能有效促进射流与近壁面气流掺混,提高流动控制效果。

An Experimental Study of Highly Load Compressor Cascade Corner Separation with Typical End Wall Plasma Actuation Layouts

In order to improve the flow control ability of plasma actuator, further optimization of the end wall actuation layouts is needed. Different end wall millisecond pulse plasma actuation layouts are carried out on low speed cascade wind tunnel. The experiment results show that the influence of the lateral flow on the end wall is greater than the axial flow. The layouts of plasma actuators are of vital importance to the flow control effects. The tangential plasma actuation layout is optimal for controlling the corner separation and total pressure loss coefficient could be reduced by 11.8% at 50% span. Nevertheless, with the change of the angle of attack, the layout of the actuator is no longer being tangential to the separation line on the end wall, weakening the flow control effect. An appropriate actuation layout is necessary for controlling the scope of the attack angle requirement. The appropriate increase of the plasma actuators could effectively promote the mixing of jet and near wall airflow and improve the flow control effect.