Effect of blade stagger angle on impeller in waterjet axial-flow pump

Three dimensional Reynolds averaged N-S equation and S-A turbulent model were adopted to simulate the flow field and hydraulic performance of the impeller in a waterjet axial-flow pump. Numerical research results show that the hydraulic performance of the impeller can be improved by increasing the inlet and outlet blade stagger angle. In the design condition,the best hydraulic performance of the impeller can be obtained when the inlet and outlet blade stagger angle respectively increases 2° and 6°. In off-design condition,the blade suction separation zone increases in low flow rate condition when the inlet blade stagger angle increases. The high efficiency zone of the impeller can be extended by increasing the outlet blade stagger angle in large flow rate condition,and the working capacity of the impeller can also be enhanced. But the flow is relatively disordered in flow rate condition,which results in the larger zone of corner separation.