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Influence of tip clearance inclination on the performance of axial flow impeller in storage mode

Tidal energy is one of the most mature energy sources used in all kinds of ocean energy. Axial flow impeller plays a key role in converting potential energy and kinetic energy of seawater into electric energy. In this study, aiming at the problem of three different clearance inclination in axial flow impeller, the axial flow impeller is studied by numerical simulation and experimental verification. The results show that the efficiency first decreases rapidly, then fluctuates within a certain range, and then decreases rapidly as the inclination changes from negative to positive. When the positive inclination is larger, the axial force and radial force are smaller. Meanwhile, the length of the clearance leakage vortex and the included angle with the axial direction are smaller. This paper provides a reference for improving the utilization efficiency of tidal energy. It also has guiding significance for the design of axial flow impeller.