To analyze the radial pressure distributions and influence factors of hydraulic slide valves,a visualized model of valve internal fluids was established by CFD software Fluent.The calcu-lations show the distribution has close relationships with the sizes of notch,flows of entrance,aspects ratio of groove cut and the angles of input and output oil passages.The larger the size of notch is the larger fluctuate of radial pressure will be.The larger the flow of entrance is the smaller aspect ratio of groove cut and the larger fluctuate will be.The distribution become more stable under the 180°angle of input and output oil passages rather than the situation of 0°and 90°at x=0 section.Meanwhile,the circumferential pressure functions and distribution of inlet middle section and axial pressure functions were established by segmentation according to Bernoulli effect to verify the reliability of the simulation model and results.Finally,the influencing factors and distribution of clamping forces caused by the unbalances of radial pressures and radial steady-state fluid forces were analyzed.%运用CFD软件Fluent对液压滑阀内部流场进行可视化分析,详细研究了阀芯受径向压力分布情况和影响因素.计算发现,径向压力分布与阀口开度、入口流量、环割槽深径比、进出口油道的轴交角都有密切的关系.阀口开度越大,径向压力波动越小;入口流量越大,环割槽深径比越小,径向压力波动越大;与进出口轴交角为0°和90°相比,进出口轴交角为180°时x=0截面的径向压力分布更平稳.同时,通过伯努利效应对入口中心截面处阀芯周向压力分布及阀芯轴向分段建立压力方程,通过理论分析验证了仿真模型和结果的可靠性.最后分析了径向力不平衡产生的卡紧力及径向稳态液动力的分布及其影响因素.
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