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以内圆弧槽流体动压型机械密封为研究对象,建立了动静环端面间液膜的三维模型,运用计算流体动力学理论和有限体积法对端面间液膜的流场特性和装置的密封性能进行了模拟和数值分析。对处于不同工况、不同密封介质条件下的液膜流场,得到了其压力、泄漏量、开启力和摩擦扭矩的变化规律及相互影响关系。结果表明:圆弧槽能够产生明显的动压效应,动压效应的大小与动环转速呈正比;液膜的压力沿径向由内径到外径逐次降低;泄露量的大小随动环转速或介质压力的增大而增大;开启力的大小与动环端面的总压力具有相似的变化规律。
In this paper, a three-dimensional model of the liquid film between the end rings of the dynamic and static rings is established by using the hydrodynamic mechanical seal with circular groove as the research object. The fluid field characteristics of the liquid film between the end faces and the sealing performance of the device are calculated by computational fluid dynamics theory and finite volume method Simulations and numerical analyzes were performed. For the flow field of liquid membrane under different working conditions and different sealing media, the changing rules and mutual relations of pressure, leakage, opening force and friction torque were obtained. The results show that the arc groove can produce obvious dynamic pressure effect. The dynamic pressure effect is proportional to the rotating speed of the moving ring. The pressure of the liquid film gradually decreases from the inner diameter to the outer diameter along the radial direction. Medium pressure increases and increases; the size of the opening force and the total pressure on the moving ring end face has a similar variation.