Analysis and Optimization of the Influence of the Cavity Structure of the Pan-Cycloid Pump on the Flow Characteristic
Abstract: To reduce the flow pulsation of the pan-cycloid pump of the aircraft engine effectively in different flight heights on the premise of maintaining excellent volumetric efficiency, simulations of flow field in the pan-cycloid pump of different cavity structure in different working heights are conducted with CFD method in this paper. It found that for high-speed single-stage pump, communicating inlet cavity or communicating both inlet and outlet cavity can reduce the flow pulsation effectively. Meanwhile, in order to reduce the pressure pulsation, the analysis under the situation of communicating both inlet and outlet cavity is carried out further, and we find that with the increase of the area of communication and decrease of the distance between the cavity, the actual flow rate increases at first and then declines, and the flow pulsation declines rapidly at first and then rises slowly. It is justified that this situation can reduce the flow pulsation effectively, while maintaining the enough actual flow. For multi-stage pump, through the simulation of two-stage pan-cycloid pump with 4 inner rotor teeth, it is proved that dislocation method can significantly reduce the flow pulsation of multi-stage pump.
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