Influence of Blade Tip Clearance on Performance of Axial-Flow Waterjet Pump

In this paper, the fine/turbo software of NUMECA was used. Based on three-dimensional steady Reynolds averaged N-S equations, S-A turbulence model used to calculate relationship between tip clearance and diameter impeller, which were δ = 0.1%, 0.3%, 0.5% 0.7% respectively. The flows four water jet axial flow pumps with different clearances numerically studied at rates. results indicate that size affects cavitation performance blades, efficiency head pump, has a great impact pump. It provides useful exploration for design improvement axial-flow waterjet