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对绝大多数液压系统结构而言,气穴是一种有害的流体现象,长期以来一直不断受到人们的关注和研究。笔者选取一闸阀采用对称模型进行研究,为了更好地优化闸阀内流场结构,采用ANSYS作为FLUENT前处理。在流场梯度变化大的区域利用自适应网格方法自动加密网格,求解方法采用SIMPLEC,离散格式均采用二阶差分格式。通过模拟表明,在阀体内壁面及阀座位置容易出现气穴,并且这些位置存在强度不等的漩涡。采用该方法,不但可以实现阀门内部流场的优化,还可以方便实现流-固耦合,因此,该方法为阀门的合理设计提供理论基础。
For the vast majority of hydraulic system structures, cavitation is a detrimental fluid phenomenon that has long been a subject of constant concern and research. I choose a gate valve symmetrical model for research, in order to better optimize the gate valve flow field structure, the use of ANSYS as FLUENT pretreatment. In the area where the gradient of the flow field changes greatly, adaptive grid method is used to automatically encrypt the grid. SIMPLEC is used to solve the problem. The second order difference scheme is adopted in the discrete form. Through the simulation shows that the valve body wall and the valve seat prone to cavitation, and the presence of these locations vary in intensity vortex. This method can not only optimize the flow field inside the valve, but also facilitate the fluid-solid coupling. Therefore, this method provides a theoretical basis for the rational design of the valve.