Abstract：To solve the stiffness design problems of spiral grooved face seals in different working conditions,the stiffness coefficient was numerically calculated,and the influencing factors of stiffness were analyzed.The Possion′s equation was used to generate boundaryfitted coordinate(BFC) grid system,and spiral curvilinear grid system was obtained with a coincident boundary of irregular physical area.Applying finite difference method(FDM) based on BFC,the Reynolds equation was discretized and numerically calculated in the computational plane.The effects of rotational speed and the ratio of inner radius over the outer radius on stiffness were analyzed.It was found that the lubricant film obtained the biggest stiffness coefficient when the radius ratio was 0.5～0.6 on the condition that the test parameters were fixed.With outer radius increasing,the stiffness increased and the effect of radius ratio was more significant.The stiffness coefficient increased linearly with increasing rotational speed,and a maximum coefficient was observed when the radius ratio was 0.5～0.6.For the narrow face seals,when stiffnes coefficient was deficient which is caused from an increased perturbation that is proportional to the rotational speed,a larger radius ratio will be necessary to ensure the seals work properly.
［1］周剑锋,顾伯勤.微扰动对液体螺旋槽机械密封性能的影响［J］.摩擦学学报,2008,28(4):327-332.Zhou Jianfeng,Gu Boqin.Influence of micro perturbation on performance of liquid spiral groove mechanical seal［J］.Tribology,2008,28(4):327-332.(in Chinese) ［2］Zhou Jianfeng,Gu Boqin,Chen Ye.An improved design of spiral groove mechanical seal［J］.Chinese Journal of Chemical Engineering,2007,15(4):499-506. ［3］Zhou Jianfeng,Gu Boqin.Characteristics of fluid film in optimized spiral groove mechanical seal［J］.Chinese Journal of Mechanical Engineering, 2007,20(6):54-61. ［4］Zhang Haojiong,Miller B A,Landers R G.Nonlinear modeling of mechanical gas face seal systems using proper orthogonal decomposition［J］.Journal of Tribology,2006,128(4):817-827. ［5］张伟政,俞树荣,丁雪兴,等.螺旋槽干气密封系统轴向振动响应及结构优化［J］.排灌机械工程学报,2010,28(3):228-232.Zhang Weizheng,Yu Shurong,Ding Xuexing,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 Engineering,2010,28(3):228-232.(in Chinese) ［6］Hashimoto H,Ochiai M.Optimization of groove geometry for thrust air bearing to maximize bearing stiffness［J］.Journal of Tribology, 2008,130(3):031101.1-031101.11. ［7］Hashimoto H,Namba T.Optimization of groove geometry for a thrust air bearing according to various objective functions［J］.Journal of Tribology, 2009,131(4):041704.1-041704.10. ［8］冯向忠,彭旭东.螺旋槽干式气体端面密封的刚度和泄漏量研究［J］.石油大学学报:自然科学版,2005,29(2):83-85.Feng Xiangzhong,Peng Xudong.Study of stiffness and leakage rate of spiral groove dry gas face seals［J］.Journal of the University of Petroleum, China:Edition of Natural Science,2005,29(2):83-85.(in Chinese) ［9］彭旭东,谭丽丽,盛颂恩,等.带内环槽的螺旋槽干式气体端面密封的静压性能［J］.摩擦学学报,2008,28(6):507-511.Peng Xudong,Tan Lili,Sheng Songen,et al.Static analysis of a spiralgroove gas seal with an inner annular groove［J］.Tribology,2008,28(6):507-511.(in Chinese) ［10］顾永泉.机械密封实用技术［M］.北京:机械工业出版社,2005:109-111. ［11］Gabriel R P.Fundamentals of spiral groove noncontacting face seals［J］.Lubrication Engineering,1994,50(3):215-224.
