基于PumpLinx的鱼雷齿轮泵内部流场及流量特性的仿真分析

为研究转速与流体介质对齿轮泵性能的影响,运用PumpLinx软件对齿轮泵内部流场及其流量进行瞬态仿真分析,并与试验数据进行对比,分析转速与流体介质对齿轮泵内部压力场及输出特性的影响。数值结果表明:齿轮泵平均流量与试验数据吻合较好,入口流量随时间呈锯齿状波动,出口流量则呈波浪状的较小波动,而且流量脉动率随转速的增大而减小;齿轮泵内压力从低压腔呈阶梯状向高压腔过渡,且入口易因超低压而出现空化现象,导致其压力脉动率高于出口。此外,流体介质为水时的流量脉动率略低于油。研究结果为降低鱼雷齿轮泵的振动和噪声等危害提供了理论指导。

Numerical simulations of internal flow field and mass flow characteristic of gear pumps in torpedo based on PumpLinx

To study the influences of rotational speed and fluid materials on the gear pump performance,the internal flow field and mass flow of the gear pump are simulated by using PumpLinx.The numerical results are compared with the experimental data,then the influences of rotational speed and fluid materials on the flow field and output characteristics of the gear pump are analyzed.The numerical results show that the time-averaged mass flow is agreed with the experimental data,and inlet mass flow fluctuates with time in a saw-tooth pattern,while outlet mass flow slightly fluctuates with time in a wavy pattern,and the mass flow fluctuations are decreased with the increase of rotational speed.Moreover,the pressure distribution in the gear pump appears like a ladder from the low pressure chamber to the high pressure chamber,and the inlet is prone to cavitation due to the low pressure,resulting in the higher pressure fluctuation.In addition,the mass flow fluctuation of the water is slightly lower than that of the oil.The research provides theoretical guidance for reducing the vibration and noise of the gear pump.