高压叶片泵流量脉动CFD模拟

高压泵是液压系统中的核心设备，流量脉动是影响其输出稳定性的重要参数。针对液压系统双作用高压叶片泵，采用CFD方法对其内部流场进行了三维瞬态模拟，分析了不同工况对出口流量脉动及其性能的影响规律。结果表明：排油初期高压差的作用使得工作腔内会出现明显的回流现象，产生较高的流量脉动；随着叶顶间隙的增大，泵的流量脉动减小，但容积效率明显下降，间隙值为30μm时，容积效率仅为61.1%;流量脉动幅度随叶片数的增多而减小；吸液压力为0.1 MPa时的流量脉动率为0.2 MPa时的4.4倍，容积效率增大了5.6%。因此，提高吸液压力可以有效改善泵的流量脉动和容积效率。

CFD Simulation of Flow Pulsation of High Pressure Vane Pump

The three-dimensional transient simulation of the internal flow field of the double acting high-pressure vane pump used in the hydraulic system is carried out by CFD method, and the effects of different working conditions on the outlet flow pulsation and its performance are analyzed. The results show that in the early stage of oil drainage, under the action of high pressure difference, there will be obvious reflux phenomenon in the cavity and produce high flow pulsation. With the increase of tip clearance, the flow pulsation of the pump decreases, but the volumetric efficiency decreases significantly, and the clearance value is 30 μm, the volumetric efficiency is only 61.1%. The amplitude of flow pulsation decreases with the increase of the number of vanes. When the suction pressure is 0.1 MPa, the flow pulsation rate is 4.4 times that of 0.2 MPa, and the volumetric efficiency increases by 5.6%. Therefore, increasing the suction pressure can effectively improve the flow pulsation and volumetric efficiency of the pump.