考虑空化效应的齿轮泵流量特性研究

The flow quality of gear pump has an important influence on the performances of hydraulic control system and lubrication system in the vehicles. The flow characteristics of gear pump in the cavitation state are studied. The gas content is calculated from the initial state and the real-time pressure, neglecting the faintly dissolved effect of air in the oil. A fluid cavitation model is established, in which the effect of gas content on oil density, effective bulk modulus and viscosity is considered. The fluid cavitation model is coupled with a gear pump dynamics model and simulated in AMESim environment. The effects of the suction pressure, rotation speed and load pressure on the flow pulsation of gear pump are analyzed. The results show that the pressure pulsation and volumetric efficiency obtained by the simulation model are consistent with the experimental data. The decrease in the suction pressure leads to the increase in the flow pulsation of gear pump and the decrease in the volumetric efficiency. The increase in the rotation speed increases the cavitation tendency. The increase in load pressure has little effect on the flow pulsation of gear pump.