离心叶轮叶片变形对性能的影响及预变形设计

Based on the two way fluid-structure interaction method, the static aeroelasticity of a high pressure ratio centrifugal impeller is numerically studied. The blade deformation under centrifugal and aerodynamic loads and effects of blade deformation on performance are analyzed, and the pre-deformation design of blades is carried out. The results show that the blade deformation is mainly manifested by the variation of tip clearance and circumferential torsion. As the tip gap decreases, the leakage flow at the leading edge is reduced and the impeller performance under the same flow condition is improved. The torsional deformation causes the backward movement of the shock wave and the decrease of the choke flow. The deviation of performance curve, uneven clearance and the decrease of blocking flow caused by blade deformation are eliminated by using a pre-deformation design method.