An approximate analytical method for calculating the performance of dry gas seals with a tilting groove bottom structure was proposed.An analytical expression of gas film thickness at groove region was established.Based on the narrow groove theory,the pressure governing equation was solved by an approximately analytical method to obtain the pressure distribution of the seal.The opening force,leakage rate and gas film thickness were calculated and compared with those by Fluent software,and they are in good agreement with each other.The results show that the influence of the tilting groove on the sealing performance depends on the initial groove depth.Compared with the even groove bottom case,the tilting groove bottom case has smaller opening force and leakage rate when the initial groove depth is small,but larger opening force and leakage rate when the initial groove depth is large.The greater the tilting degree of groove bottom is,the larger the opening force and leakage rate are.In general,the tilting groove bottom spiral groove dry gas seal has a larger axial film stiffness,the greater the tilting degree of groove bottom,the larger the film stiffness,and the stronger the antiinterference ability.
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邹伟,宋鹏云.槽底倾斜度对螺旋槽干气密封性能的影响[J].润滑与密封,2017,42(11):64-68. . Influence of Groove Bottom Inclination on the Performance of Spiral Groove Dry Gas Seal[J]. Lubrication Engineering,2017,42(11):64-68.