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基于质量守恒边界条件,建立了径向直线槽端面密封空化特性的数值模型.控制方程为考虑惯性的定常不可压缩Reynolds方程,利用有限控制体积法对其进行离散,采用分块加权方法计算膜厚突变处流量,迭代方法为Gauss-Siedel松弛迭代,并对空化特性影响因素进行了分析.结果表明:不同工况下,油膜破裂位置均在膜厚突然增大处,密封坝阻碍空化的产生;空穴区域随着转速的增大而增大,随着槽深的增大而减小;空化区域在径向由静压决定,周向由动压决定,二者对空化的影响相互独立.
Based on the mass conservation boundary conditions, a numerical model of seal cavitations of radial straight groove face is established. The governing equation is a constant and incompressible Reynolds equation considering inertia, which is discretized using finite volume control method. The results show that under different conditions, the rupture position of the oil film suddenly increases at the film thickness, and the sealing dam impedes the cavitation The cavitation area increases with the increase of rotational speed and decreases with the increase of the groove depth. The cavitation area is determined by the hydrostatic pressure in the radial direction and the circumferential direction by the dynamic pressure. The effects are independent.