Numerical analysis on inducer and impeller combination with different blade wrap angle in aero fuel centrifugal pump

The aero fuel pump is a significant accessory for aircraft fuel system. To enhance the anti-cavitation capability of the pump and reduce hydraulic loss, the paper try to combine the inducer and impeller. Three centrifugal pump combination impellers were designed with different wrap angle. The impact of the wrap angle on the pump hydraulic performance was numerically performed and analyzed by using a computational fluid dynamics code based on the Realizable k-ε turbulence model, in which the influence of rotation and curvature are considered. The simulation results predicted indicate that the inducer and impeller combination can increase the hydraulic efficiency. In addition, this combination can reduce the inlet flow rate and increase the inlet pressure, enhance the anti-cavitation capability of the centrifugal pump. As the wrap angle increases, the pump pressurization values and efficiency increases first and then decreases. In addition, the maximum hydraulic efficiency point gradually shifts to a smaller flow rate. Therefore, it can be inferred that when the impeller parameters are basically determined, there must be an optimal blade wrap angle. Furthermore, current study new impeller form for further study of design of aero fuel centrifugal pumps.