跨声压气机缝式处理机匣非定常模拟研究

在Rotor37单级跨声压气机上进行了斜缝、带气室斜缝和半圆斜缝处理机匣下的压气机全三维非定常数值模拟.结果表明,缝式处理机匣的扩稳与其对泄漏流的影响和利用压差进行泄漏涡抽吸密切相关,在足够导通能力下,所利用的压差越大,抽吸能力越强,扩稳效果越明显.气室可通过改善斜缝输运条件来提高压气机裕度,而叶片角向斜缝则能通过增大斜缝进出口压差来进一步提高抽吸能力,但同时也带来了压比和效率的损失.

Unsteady numerical simulation on transonic compressor with screwed slots casing treatment

This paper performs time-accurate 3D unsteady numerical simulations on Rotor37 with cases of screwed slots,slots with cell,and semicircle slots respectively in order to improve casing treatment and acquire lower mass flow at near stall condition.The presented results show that the stall margin increment of slots is closely related to their effects on the leakage flow and their ability to suck the leakage vortex under the help of differential pressure at blade tip.If enough transfer ability is available,the higher the pressure head is,the more powerful the suction will be,and more significant increase will be gained in nearsurge flow stability.The cell on the top of slots can improve the condition of translation with an effect to expand stall margin.And screwed slots angular to the blade can make use of more pressure head between its inlet and outlet to enhance suction;however,non-negligible decreases in efficiency are also observed in this situation.