摘要
齿轮泵的流量品质对车辆液压操纵系统和润滑系统性能有重要影响,为此开展了空化状态下齿轮泵流量稳定性及其影响规律的研究。忽略空气在油液内微弱的溶解效应,根据油液初始状态和实时压力计算油液含气率,考虑含气率对油液密度、有效体积弹性模量和黏度的影响,建立流体空化模型。将流体空化模型与齿轮泵动力学模型相耦合,在复杂系统建模与仿真软件AMESim环境下仿真求解,分析吸油压力、转速和负载压力对齿轮泵流量特性的影响规律。结果表明:仿真得到的齿腔压力脉动、容积效率与文献[16]试验数据比较一致;吸油压力对齿轮泵流量脉动影响最为显著,当吸油压力由1.01 bar降低至0.27 bar时,流量脉动增大1倍多,容积效率降低;转速升高会加剧空化倾向;负载压力升高对齿轮泵流量脉动影响很小;该研究对齿轮泵流量稳定性的预测和改善有理论指导意义。
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.
作者
周俊杰
苑士华
荆崇波
ZHOU Junjie;YUAN Shihua;JING Chongbo(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2020年第1期189-195,共7页
Acta Armamentarii
基金
流体动力与机电系统国家重点实验室开放基金项目(201718)
关键词
齿轮泵
空化
流量特性
体积弹性模量
流量脉动
gear pump
cavitation
flow characteristic
bulk modulus
flow pulsation
