非圆齿轮泵流量特性分析及脉动优化方法

Analysis on Flow Characteristics and Pulsation Optimization of Non-circular Gear Pump

为解决非圆齿轮泵在流体输送过程中其大排量导致的剧烈流量脉动问题,提出一种将ADAMS-Simulink联合仿真与计算流体力学(CFD)数值模拟相结合的优化方法,实现齿轮泵转子平稳传动从而降低其流量脉动。分析高阶椭圆齿轮转子的传动特性,讨论齿轮偏心率及其阶数对传动比的影响,以卵形齿轮转子为例分析偏心率对流量脉动的影响;搭建基于Simulink和ADAMS的联合仿真模型,利用PID实现卵形齿轮泵转子的平稳传动,达到缓冲减振的目的;利用Fluent动网格技术,对卵形齿轮泵进行CFD数值仿真,并基于Visual Studio网络编程平台实现Fluent和Simulink之间的数据耦合,精确模拟转子平稳传动时的变速比关系。结果表明:转子平稳传动后其流量脉动降低30.72%,该方法能够在不改变齿轮泵内部结构的情况下平抑流量脉动,具有显著的优化效果。

Aiming at the problem of flow pulsation caused by large displacement of non-circular gear pump during the fluid transmission process,the optimization method combining ADAMS-Simulink co-simulation with computation fluid dynamics(CFD)numerical simulation was proposed to realize the smooth transmission of gear pump rotor and reduce its flow pulsation.The transmission characteristics of high-order elliptical gear rotor were analyzed,and the influence of eccentricity and order of gear on transmission ratio was discussed.The effect of eccentricity on flow pulsation was analyzed by taking ovoid gear rotor as an example.A co-simulation model based on Simulink and ADAMS was built.PID control was used to realize the smooth transmission of the ovoid gear pump rotor to achieve the purpose of cushioning and damping.CFD numerical simulation analysis of ovoid gear pump was carried out by using Fluent dynamic mesh technology.The data coupling between Fluent and Simulink was realized based on Visual Studio network programming platform.The relation of speed ratio with smooth transmission of the rotor was precisely simulated.The results show that the flow pulsation of the rotor is reduced by 30.72% after smooth transmission.The method can suppress the flow pulsation without changing the internal structure of the gear pump.It has a remarkable optimization effect.