油液特性对柱塞泵流量脉动影响的仿真分析

为研究油液特性对轴向柱塞泵流量脉动的作用规律，对比分析了油液的压缩性、黏性、含气量和流动状态与柱塞泵流量脉动之间的关系，运用FLUENT流场仿真软件对轴向柱塞泵的运动特性进行模拟。数值仿真结果表明：压缩性对泵源流量脉动的影响最大，油液黏性的影响次之，含气量的影响较小，流动状态的影响最小，以上因素的影响程度占油液特性影响的比例分别为86.8%、9.45%、3.59%、0.16%;油液的黏性对泵容积效率的影响最大，压缩性的影响次之，含气量的影响较小，流动状态的影响最小。模型的准确性得到了实验验证，为开展柱塞泵动力学建模以及机电液系统全局耦合性能仿真分析提供了理论依据。

Effects of Oil Properties on Flow Pulsation of Axial Piston Pumps by Simulation Analysis

In order to study the effects of oil characteristics on flow ripple of the axial piston pumps, the relationship among the oil compressibility, viscosity, gas hole, the flow state and flow pulsation was researched based on the movement characteristics of axial piston pumps using the FLUENT software.The results show that the effects of oil compressibility, viscosity, gas hole and the flow state on the flow pulsation are all existed where the oil compressibility has the biggest effects and the flow state has the smallest effects. And the proportion of effects is as 86.8%,9.45%, 3.59%, and 0.16% respectively. Then the simulation results were validated by experimental tests and the accuracy of the simulation was acceptable. So it provides a theoretical basis for the dynamics modeling of piston pumps and simulation and analysis on the global coupling performance of electro hydraulic systems.