级间进出口几何角度对压气机气动性能和封严效果的影响

In order to weaken the adverse effect of the inter-stage leakage flow on the performance of the compressor, an inter-stage structure based on Coanda type geometry inlet and outlet is proposed. Then, taking a subsonic single-stage axial flow compressor as the research object, the effects of three different geometric angle of 5°, 10° and 20° of inter-stage inlet and outlet on the performance of the compressor were numerically simulated. The results show that the improved inter-stage inlet and outlet geometry makes the compressor flow and efficiency slightly improved. The reason for the analysis is that the leakage flow of the inter-stage outlet merges with the main flow of the compressor at a smaller angle, which increases the axial and radial velocity of the stator passage, so that the flow blockage of the stator passage is weakened, the total pressure loss is also reduced, and the diffuser capability of stator passage is enhanced. At the same time, the new structure also reduces the discharge coefficient of inter-stage leakage flow and improves the sealing effect. The isentropic adiabatic efficiency of the single stage compressor at three angles(5°, 10°, 20°) rise by 0.68%, 0.63% and 0.62%, respectively at the maximum.