摘要 Considering the effect of both viscosity-temperature relationship and cavitation of microscale film,the influencing factors on hydrodynamic lubrication performance of upstream pumping mechanical seal were investigated based on the theory of hydrodynamic lubrication. N-S equation, energy equation, viscosity-temperature equation and vapor transport equation were solved with the finite [JP3]volume method by using Fluent software, which was performed to [JP]analyze the influence of the viscosity-temperature effect and cavitation effect on hydrodynamic lubrication failure of the film. The research demonstrated that it will lead to the significant difference of the temperature field by considering the coupling of temperature and viscosity. When the film thickness decreased and the rotating speed rose, cavitation regions and viscous friction heat increased, the opening force of the film was also enhanced. However, the growth rate was restricted to the cavitation regions and viscous friction heat, and the opening force began to decline to a certain extent, and thereby being insufficient to open the surfaces of the seals and leading to the failure of automatic adjustment function and severe wear, lubrication failure occurred. Through comprehensive research on the influences of viscosity-temperature and cavitation effect on hydrodynamic lubrication performance, the theories of failure and design of upstream pumping mechanical seal were further developed.
［1］WANG Yuming, LIU Wei, LIU Ying. Current research and developing trends on noncontacting mechanical seals［J］. Hydraulics pneumatics ＆ seals, 2011(2):29-33. (in Chinese)［2］HUANG Ping. Analysis of lubrication failure［J］. Journal of South China University of technology(natural science edition), 2002, 30(11):95-100. (in Chinese).［3］HUANG Ping, WEN Shizhu. Analysis of temperature dependent nonnewtonian constitutive equation and lubrication mechanism［J］.Lubrication engineering, 1996(2):14-16,26. (in Chinese)［4］ZHANG Guangjun, MENG Huirong, HUANG Ping, et al. A study on mechanism of hydrodynamic lubrication failure［J］.Machine design, 1997(1):30-32,35. (in Chinese)［5］BONCOMPAIN R, FILLON M, FRENE J.Analysis of thermal effects in hydrodynamic bearings［J］.Journal of tribology, 1986, 108:219-224.［6］WEN Shizhu, HUANG Ping.Principles of tribology［M］.Third edition.Bei Jing:Tsinghua University Press, 2008. (in Chinese)［7］BRUNETIERE N, GALENNE E, TOURNERIE B, et al. Modeling of nonlaminar phenomena in high reliability hydrostatic seals operating in extreme conditions［J］.Tribology international, 2008, 41(4):211-220.［8］GU Boqin, ZHOU Jianfeng, CHEN Ye, et al. Law of frictional heat transfer of the liquid film between the mechanical seal faces ［J］.Science in China(series E:technological sciences), 2008, 38(1):137-147. (in Chinese)［9］LIU Wei, PENG Xudong, BAI Shaoxian, et al. Numerical analysis of threedimensional heat transfer model of hydrostatic mechanical seals［J］.Tribology, 2010, 30(1):57-63. (in Chinese)［10］XU Jing, PENG Xudong, MENG Xiangkai, et al. Numerical Aanalysis of noncontacting gas-lubricated seal thermal effect［C］∥2011 Proceedings of the National Youth Conference on Tribology and Surface Engineering, 2011:5. (in Chinese)［11］XU Jing, PENG Xudong, BAI Shaoxian, et al. Effects of surface microscale and viscosity-temperature relationship on sealing performance of spiral-grooved dry gas seal［J］.CIESC journal, 2013, 64(9):3291-3300. (in Chinese)［12］PENG Xudong, ZHANG Fengyun, BAI Shaoxian, et al. Hydrostatic performance of a dry gas seal with bionic twinpath spiral grooves［J］. Journal of drainage and irrigation machinery engineering, 2013, 31(10):888-893. (in Chinese)［13］WANG Jing, BAI Shaoxian, SHENG Songen, et al. Experimental study on lubrication temperature rise behavior of microinclined-pored surfaces［J］.Lubrication engineering, 2013, 38(12):27-31. (in Chinese)［14］MENG Xiangkai, BAI Shaoxian, PENG Xudong.Lubricating film flow control by oriented dimples for liquid lubricated mechanical seals［J］.Tribology international, 2014, 77(6): 132-141.［15］WANG Tao, HUANG Weifeng, WANG Yuming.Research and progress of mechanical seals operating with vaporization transition［J］.CIESC journal, 2012, 63(11):3375-3382. (in Chinese)［16］CHEN Huilong, WU Qiangbo, XU Cheng, et al. Research on cavitation regions of upstream pumping mechanical seal based on dynamic mesh technique［J］.Advances in mechanical engineering, 2014(11):1-8.［17］BRENNEN C E. Cavitation and bubble dynamics［M］. New York:Oxford University Press, 1995.