轴向偏转型自循环机匣处理对高速压气机扩稳效果的影响机理

In order to weaken the negative effect of tip leakage flow and expand the stable working range of axial compressor, an improved axial deflection self-recirculating casing treatment structure was proposed. The deflection angle is the angle between the chord length of the blade top and the axial direction of the compressor. Taking an isolated rotor of high-speed axial compressor as the research object, two kinds of treatment schemes of deflection type self-recirculation casing, positive and reverse deflection, were designed firstly, and then a single channel unsteady numerical simulation was carried out. The results show that, compared with the solid wall casing, the comprehensive stability margin of the compressor increased by 11.52% and 10.15%, respectively when it is treated with positive and negative deflection self-recirculation casing, and the peak efficiency only decreases by 0.32% and 0.59%, respectively. Compared with the axial negative deflection self-recirculation treatment, the axial positive deflection self-recirculation has better stability expansion effect and less efficiency reduction.