组合机匣处理对跨音压气机流动特性的影响

To expand the influence range of flow control technology and further improve the performance of rotor, a combined casing structure with axial skewed slots and suction slots is presented, and the influences of the combination of two flow control technologies on the flow field characteristics and performance of the transonic compressor are investigated numerically by steady state simulation. The results show that the stall margin is increased by 5.52% while the peak efficiency reduces by 2.5%, which indicates the significantly improved performance of the rotor. In addition, the flows at both blade tip and end wall are ameliorated; the combined effect of the two structures weakens shock wave intensity and fluid separation, and reduces the area of low velocity region. Although the interaction between the two structures can provide energy for the low-energy fluid, the mixing of the jet flow and the mainstream flow causes a certain mixing loss and increases the tangential momentum and secondary flow loss to lower the rotor efficiency.