转频调制下齿轮泵压力脉动机理

Gear pump, as a main fuel pump, is a core component of aero-engine fuel system. Its safety performance directly affects the performance of the whole engine. In order to solve the problem that the mechanism of pressure pulsation of gear pump is not clear, the dynamic modeling of pressure pulsation during gear meshing is studied. Firstly, the dynamic model of pressure pulsation in the process of single gear meshing of gear pump was established by Euler method, and the variation rule of pressure pulsation in the process of single tooth engagement was analyzed. The correctness of the model was verified by comparing the simulation data and experimental data of pressure pulsation at the outlet volume of gear pump. Secondly, considering that the outlet volume fluid of the gear pump is turbulent, the pressure pulsation model at the outlet measuring point is proposed according to the periodic movement of the gear pump, and the modulation effect of the frequency on the pressure pulsation signal is discussed. Finally, the influence of different working conditions on pressure pulsation is discussed. With the increase of the workload, the frequency of pressure pulsation remains unchanged, but the amplitude of pressure pulsation increases. With the increase of rotating speed, the frequency of pressure pulsation increases and the amplitude of pressure pulsation decreases.