螺旋槽干气密封润滑气膜摩擦系数的规律探寻

高参数工况下的气膜摩擦力对干气密封性能的影响不可忽视。基于密封系统和动静环的结构特点，建立了润滑气膜计算域模型，使用ICEM划分网格，采用Fluent软件数值模拟获得气膜压力分布和速度分布，最后通过牛顿内摩擦定律计算得到润滑气膜摩擦系数。结果表明，槽型参数不变，润滑气膜摩擦系数随转速的增大而增大，随介质压力及平均气膜厚度的增大而减小；工况参数不变，气膜摩擦系数随根径的增大而增大，随槽数及槽深的增大而减小，且在75°~76°螺旋角范围内较为稳定。

Investigation of the Frictional Coefficient in Lubricating Film of the Spiral Groove Dry Gas Seal

The effect of friction to dry gas seal performance can’t be ignored under the condition of high parameter. Based on the structure characteristics of the sealing system and end⁃face, it was established the calculative model of lubricating gas film, used IC⁃EM to divide the grid. Then, conducted numerical simulation to get gas film pressure distribution and velocity distribution by using Fluent software. Finally, it calculated the friction coefficient of lubricating film by the law of Newton internal friction. The result of research shows that the friction coefficient of the lubricating film increases with the increase of the rotational speed, and it decreases with the increase of the medium pressure and the average film thickness in the groove parameters remain unchanged case. When the operating parameters are unchanged, the film friction coefficient increases with the increase of the root diameter, decreases with the increase of the number of grooves and the depth of the groove, and in 75° to 76° spiral angle range is relatively stable.