Dynamic response of axial vibration and structural optimization for dry gas seal system with spiral groove
Zhang Weizheng1,2, Yu Shurong1, Ding Xuexing1,2, Han Mingjun3, Du Zhaonian2
(1.College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou,Gansu 730050, China; 2.Wenzhou Research Institute of Pump and Valve Engineering, Lanzhou University of Technology, Wenzhou, Zhejiang 325105, China; 3.School of Science, Lanzhou University of Technology, Lanzhou, Gansu 730050, China)
A calculation model on the fluid-solid coupling system of gas film and seal rings subjected to axial vibration was established by taking static seal ring as the oscillator, and the Reynolds equation was approximately solved by using PH linearized method, complex function variables separation method and small parameter iterative method.The approximate analytic expression of gaseous film dynamic pressure and gaseous film force were obtained.Axial forced vibration equation of single degree of freedom was established by taking gas film force as the exciting force, which was solved by using the Runge-Kutta algorithm, then the vibration phase chart and the time history chart responded by the different spiral angles and grooved depth were obtained, and the effect of spiral angles and grooved depth on vibration displacement was analysed. The results show that vibration parameters were affected by spiral angles and grooved depth, and the vibration caused by spiral angles is the dominant one.The vibration amplitude of seal ring can be controlled by changing spiral angles and grooved depth, and the dynamic stability of gas seal can be kept by selecting their optimal value.The optimal values of the spiral angles and the groove depth in this example are 74°58′48″ and 5 μm respectively,and which are in agreement with the experimental data.
ZHANG Wei-Zheng,YU Shu-Rong,DING Xue-Xing et al. Dynamic response of axial vibration and structural optimization for dry gas seal system with spiral groove[J]. Journal of Drainage and Irrigation Machinery Engin, 2010, 28(3): 228-232.
Du Zhaonian, Ding Xuexing, Yu Shurong, et al. A stability analysis for lubricating gaseous film of the sprial grooved gas seals subjected to axial perturbation[J].Lubrication Engineering, 2006，31(10): 127-130. (in Chinese)
Ding Xuexing, Wang Yue, Zhang Weizheng, et al. A stability analysis for lubricating gaseous film of spiral grooved gas seals subjected to angular eddy motion[J].Journal of Beijing University of Chemical Technology: Natural Science Edition, 2008,35(2): 82-86. (in Chinese)
Zhang Weizheng, Yu Shurong, Ding Xuexing, et al. Dynamic pressure calculation of steady-state micro-scale flow field in spiral grooved dry gas seals[J]. Journal of Lanzhou University of Technology, 2006, 32(6): 72-75.(in Chinese)
Gabriel R P. Fundamentals of spiral groove noncontacting face seals[J]. Lubrication Engineering, 1994,50(3):215-224.