关键词: 计算流体动力学, 液压滑阀, 径向压力, 伯努利效应

Abstract: 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 calculations 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.

Key words: compute fluid dynamics(CFD), hydraulic slide valve, radial pressure, Bernoulli effect