Three-dimensional models of spiral groove dry gas seal with five different gas film thicknesses were built by Solid-works software, and all of these five models were screened by Gambit software. In specific conditions, the five kinds of models were numerically calculated by Fluent software and the pressure distribution and gas film thrust were obtained. The polynomial of opening force and film thickness were obtained using the least squares method. Polynomials of gas film stiffness and gas film thickness were obtained through derivation of film thickness. The result shows that the gas film stiffness decreases with the increase of the film thickness. In order to stabilize the dry gas seal system, the generation of gas film with enough stiffness is necessary.%利用Solidworks软件对螺旋槽干气密封端面五种不同气膜厚度进行三维立体模型建模,采用FLUENT前处理功能对其进行网格划分.在特定工况下,利用Fluent流场计算软件对五种端面微尺度流场模型进行数值计算,求出压力沿径向分布和气膜厚度对应的开启力,基于最小二乘法原理基础上,求出开启力与厚度的五次多项式,在对多项式关于气膜厚度求导,得出气膜刚度与气膜厚度的四次多项式.结果表明:气膜刚度随着气膜厚度的增大而减小,且随着气膜厚度的增加气膜刚度随厚度变化曲线趋于平稳,为了使干气密封长期安全、稳定的工作,端面气膜应有足够大的刚度.
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