|
|
Numerical simulation on flow field of aerostatic dry gas seal |
Wang Heshun1, Dong Lin1, Huang Zepei2, Zhang Chening2, Chen Cichang3 |
(1.School of Mechanical Engineering and Automation, Xihua University, Chengdu, Sichuan 610039, China; 2.Sichuan Nikki Seal Co. Ltd., Chengdu, Sichuan 610046, China; 3.School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China) |
|
|
Abstract In order to improve the performance of an aerostatic dry gas seal, the flow field numerical simulationwas carried out based on the N-S equation, laminar flow model and SIMPLEC algorithm with different throttle diameters and face clearances. The gas film pressure distributes and force changes were analyzed especially. The results show that significant pressure drop formed after the gas flows through orifice, and the drop value increases with clearance increases, decreases with orifice diameter increases. The highestpressure appears at the center of shallow groove, and is gradually declining to around. Bigger pressure gradient appears in the shallow groove near the edge area. The opening force general decreases with clearance, minimum value is close to zero. When the face clearance is in the range of 5-12 μm, the opening force increases rapidly with clearance decreasing, therefore larger gas film stiffness is formed. According to calculations, smaller orifice diameter is helpful to get larger gas film stiffness under the conditionsof less face clearance. Both hydrostatic and hydrodynamic test were carried out, the diameter of the seal tested was 30 mm and the test speed is of 50-300 r/min. The leakage and wear were monitoredand the results show that the sealing achieved stable non-contacting operation.
|
Received: 17 August 2010
Published: 30 March 2011
|
|
|
|
[1]魏 龙,顾伯勤,冯 飞,等.接触式机械密封端面微凸体变形特性研究[J] .排灌机械工程学报,2010, 28(1): 77-82.Wei Long, Gu Boqin, Feng Fei, et al. Research on deformation property of end face asperity of contact mechanical seals[J]. Journal of Drainage and Irrigation Machinery Engineering , 2010, 28(1):77-82. (in Chinese)[2]孙泽刚,黄文权. 机械密封密封腔的流场及温度场[J]. 排灌机械, 2009, 27 (3) : 200 - 203.Sun Zegang, Huang Wenquan. Simulation of flow field and temperature field for mechanical seal cavity[J]. Drainage and Irrigation Machinery , 2009, 27 (3): 200 -203. (in Chinese)[3]刘 墩,刘育华,陈世杰.静压气体润滑[M].哈尔滨:哈尔滨工业大学出版社,1990: 51-251.[4]王 婧,张 力,邓达强,等.准气体动力循环Power MEMS气体静压轴承[J].重庆大学学报:自然科学版,2007, 30(7): 18-21.Wang Jing, Zhang Li, Deng Daqiang, et al. Externally pressurized gas journal bearings in Power MEMS of quasi gas power cycle[J]. Journal of Chongqing University :Natural Science Edition , 2007, 30(7): 18-21. (in Chinese)[5]Yu Xiaodong, Meng Xiuli, Wu Bo, et al. Simulation research on temperature field of circular cavity hydrostatic thrust bearing[J]. Key Engineering Materials , 2010(419/420): 141-144.[6]Manring Noah D, Johnson Robert E, Cherukuri Harish P. The impact of linear deformations on stationary hydrostatic thrust bearings[J]. Journal of Tribology , 2002,124(4): 874-877.[7]Koga, Tadashi, Fujita, et al. The hydrostatic gas noncontact seal[J]. ASLE Transalations ,1986, 29(4): 505-514.[8]Stolarski T A, Xue Y. Performance study of a backdepression mechanical dry gas seal[C]∥Proceedings of the Institution of Mechanical Engineers , 1998, 212(4):279-290. [9]Fujiwara S, Fuse T.Advanced aerostatic dry gas seal[C]∥16th International Conference on Fluid sealing, BHR Group 2000 Fluid Sealing , 2000:483-499.[10]余建平. 静压气体润滑机械密封特性研究[D].昆明:昆明理工大学生物与化学化工学院,2008. |
|
|
|