跨声叶栅角区激波/附面层干扰的开槽控制措施

提出了使用叶根槽作为一种被动控制手段来控制跨声叶栅的角区分离问题。在压力面与吸力面的压差作用下，叶根槽可产生自发射流，为叶栅吸力面侧角区注入高能流体，从而控制跨声叶栅的角区分离问题。通过数值模拟的方法分析了在不同攻角下叶根槽对压气机叶栅性能的影响及作用机理。结果表明:在小攻角下，叶根槽射流可破坏角区环形涡，从而有效减小跨声叶栅角区分离，提高叶栅的流通能力，改善叶栅性能；在大攻角下，叶根槽射流已不能破坏角区环形涡，但仍能为角区低能流体充能，减弱角区分离，从而拓宽叶栅工作范围。在0°攻角下总压损失系数可降低11.6%，同时叶栅攻角裕度由2°拓宽为3°。 

Control of blade end slot on shock wave/boundary layer interaction of transonic cascade corner

A method of using the blade end slot for passive control of the corner separation in a transonic compressor cascade was proposed. Because of the pressure difference between the pressure and suction sides, the blade end slot enables one to induce jet flow into the corner region, thereby restraining the corner separation in transonic cascade. The effect and mechanism of the blade end slot on the performance of the compressor cascade at different incidence angles were investigated numerically. The results demonstrate that, at smaller incidence angle, high-speed jet flow through the blade end slot can destroy the ring vortex in corner region, thereby reducing the corner separation, improving the performance of the cascade; at larger incidence angle, the jet flow can no longer destroy the ring vortex, but still re-energized the low-momentum fluid in the corner region, suppressed the corner separation, and the operation range was extended. The blade end slot reduced the total pressure loss coefficient by 11.6% at 0° incidence angle, and the operation range were increased from 2° to 3°.