基于数值模拟的新型摆动泵流场分析

Flow field analysis of a new swing pump based on numerical simulation

传统的往复泵存在着结构复杂和流量脉动大等问题,为此,以圆弧形状作为摆动泵的转子形状,提出了一种新型的摆动泵模型,并对摆动泵的内部流场进行了研究。首先,分析了摆动泵的工作原理,建立了摆动泵的几何模型;然后,使用ICEM软件对摆动泵的几何模型进行了网格划分,利用Fluent软件的动网格技术、RNG kε的湍流模型,对摆动泵的流体区域进行了数值模拟,在数值模拟过程中使用自定义UDF改变摆动泵的进出口边界条件;最后,通过计算得到了摆动泵内部不同时刻的压力分布云图、速度分布云图和流量脉动曲线。研究结果表明:摆动泵腔体内部的压力主要集中在出油腔,且压力的大小随着速度变大而变大,最大压力为0.52 MPa;同时,最大流速集中在出油口处,最大速度为8 m/s;流量脉动曲线与转子的加速度具有相同的波形;该减小流量脉动的方法可为摆动泵流量脉动的研究提供一定的参考。

Aiming at the problems of complex structure and large flow fluctuation of traditional reciprocating pump,a new type of swing pump model was proposed.The circular shape of the rotor was used as the shape of the swing pump,and the change of the flow field in the swing pump was studied.Firstly,the working principle of the swing pump was analyzed and the geometric model of the swing pump was established.Then,the geometric model was meshed by ICEM software,the dynamic mesh technology of Fluent software and the turbulence model of RNG kεwere used to numerically simulate the fluid region of the swinging pump.During the numerical simulation,custom UDF was used to change the boundary conditions of the inlet and outlet.Finally,the pressure and velocity distribution nephograms and flow fluctuation curve of the pump at different time were obtained.The results show that the pressure inside the cavity is mainly concentrated in the oil outlet cavity,and the pressure increases as the speed increases,the maximum pressure is 0.52 MPa.And the maximum flow rate is concentrated at the oil outlet,and the maximum speed is 8 m/s.The flow pulsation curve has the same waveform as the acceleration of the rotor.A method to reduce the flow pulsation is proposed,which provides a certain reference for studying the flow pulsation of the swing pump.