中文摘要：

探讨了等离子体影响扩压叶栅性能的机理，提出了一种考虑等离子体能量注入、可较全面评价等离子体改善叶栅流动所带来收益的损失评价方法。研究表明，等离子体可有效控制栅内流动分离、减小尾迹掺混，30kV电压下叶栅总压及能量损失分别减小12．3％和9．6％，同时等离子体也增加了壁面附近摩擦损失，分离区前施加流动控制时其效果变弱；等离子体影响叶栅流动的机制可归结为诱导作用区上游流体加速降压、在作用区内构造局部顺压力梯度以及增加电极附近的气流速度。

英文摘要：

The mechanism of plasma effect on the performance of high-turning compressor cascade was investigated and a new comprehensive evaluation method of energy loss was proposed, in which the energy input into the flow by plasma was considered. The results show that the flow separation is alleviated and the wake mixing is reduced by plasma effect. The total pressure loss and the energy loss is reduced by 12.3% and 9.6% respectively when a voltage of 30 kV is applied. However, the plasma also enhances the friction loss near the plasma region. When the electrodes are placed upstream the separation region, the ability of the plasma actuator is weakened greatly. The mechanisms of the plasma effect on influencing the flow field are inferred to include： first, reducing the pressure upstream the plasma region by inducing acceleration; second, generating a local favorable pressure gradient within the plasma region; third, increasing the flow velocity near the electrodes.