不同进水压力下水润滑轴承润滑特性试验研究
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摘要
针对海水淡化高压泵水润滑轴承-转子系统在运行过程中由于进水压力的改变而带来的安全、可靠和稳定性等问题,以轴心轨迹以及周向压力脉动为主要研究目标,对干、湿转子在不同进水压力下水润滑轴承轴心轨迹数值模拟,并通过前期设计研制的海水淡化高压泵用水润滑轴承试验台对干、湿转子在不同进水压力下水润滑轴承运行过程中轴心轨迹及周向压力脉动进行试验研究.从计算和试验结果的总体变化趋势可以得知,进水压力对干转子情况下液膜形成的影响较大,而湿转子由于转子系统阻尼因素影响,进水压力对轴心轨迹影响变小,但整体变化趋势与干转子变化趋势相近,对系统整体而言在进水压力为0.2 MPa时,系统运行较为稳定,文中为进一步提高万吨级海水淡化高压泵系统稳定运行提供了一定的研究基础.
The variation of inlet pressure can affect the safety,reliability and stability of the water lubricated bearing rotor system in a seawater desalination high-pressure pump. In this study,numerical simulations were carried out on the shaft orbits of dry and wet rotors under different inlet pressures to clarify the axial force and circumferential pressure distributions. Additionally,the shaft orbits and circumferential pressure fluctuation were measured when the water lubrication bearings were in operation at different inlet pressures based on a water lubricated bearing test stand for seawater desalination high-pressure pumps designed and developed in the first-phase of a project. The simulated and measured results show that the influence of inlet pressure on the liquid film formation is more substantial in the dry rotor. For the wet rotor system,however,due to the damping factor in the system,the influence of the inlet pressure on the axis orbit is smaller,but the overall variation trend is similar to that of the dry rotor. For the system as a whole,the operation of the rotor system is stable as the inlet pressure was at 0.2 MPa. This study has provided some research basis for improving the operational stability of the ro-tor system in a seawater desalination high-pressure pump further.
The variation of inlet pressure can affect the safety,reliability and stability of the water lubricated bearing rotor system in a seawater desalination high-pressure pump. In this study,numerical simulations were carried out on the shaft orbits of dry and wet rotors under different inlet pressures to clarify the axial force and circumferential pressure distributions. Additionally,the shaft orbits and circumferential pressure fluctuation were measured when the water lubrication bearings were in operation at different inlet pressures based on a water lubricated bearing test stand for seawater desalination high-pressure pumps designed and developed in the first-phase of a project. The simulated and measured results show that the influence of inlet pressure on the liquid film formation is more substantial in the dry rotor. For the wet rotor system,however,due to the damping factor in the system,the influence of the inlet pressure on the axis orbit is smaller,but the overall variation trend is similar to that of the dry rotor. For the system as a whole,the operation of the rotor system is stable as the inlet pressure was at 0.2 MPa. This study has provided some research basis for improving the operational stability of the ro-tor system in a seawater desalination high-pressure pump further.
引文
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[15]张国渊,袁小阳,苗旭升,等.水润滑高速动静压轴承试验研究[J].摩擦学学报,2006,26(3):238-241.ZHANG Guoyuan,YUAN Xiaoyang,MIAO Xusheng,et al.Experimental for water-lubricated high-speed hydrostatic journal bearing[J].Journal of tribology,2006,26(3):238-241.(in Chinese)
[2]杨尚宝.中国海水淡化年鉴[M].北京:中国计划出版社,2013.
[3]GRNDISCH A,SCHNEIDER B P.Optimising energy consumption in SWRO systems with brine concentrators[J].Desalination,2001,138(1):223-229.
[4]蒋小平,施卫东,李伟,等.泵水润滑轴承-转子系统的动力学特性研究[J].农业机械学报,2013,44(1):62-66.JIANG Xiaoping,SHI Weidong,LI Wei,et al.Rotor dynamic characteristics of water lubricated bearing for pumps[J].Transactions of the CSAM,2013,44(1):62-66.(in Chinese)
[5]史冬岩,张成,任龙龙,等.滑动轴承压力分布及动特性系数[J].哈尔滨工程大学学报,2011,32(9):1134-1139.SHI Dongyan,ZHANG Cheng,REN Longlong,et al.Research on the oil film pressure and dynamic coefficient of a sliding bearing[J].Journal of Harbin Engineering University,2011,32(9):1134-1139.(in Chinese)
[6]胡敬宁,薛岩,张德胜,等.海水淡化高压泵水润滑轴承液膜压力分布[J].排灌机械工程学报,2014,32(3):235-241.HU Jingning,XUE Yan,ZHANG Desheng,et al.Pressure distribution in liquid film in water lubricated bearings of high-pressure pump for desalination[J].Journal of drainage and irrigation machinery engineering,2014,32(3):235-241.(in Chinese)
[7]TOWER B.First report on friction experiments[J].Proceedings of the institution of mechanical engineers,1883,34(1):632-659.
[8]CONWAY H D,ENGEL P A.The elastohydrodynamic lubrication of a thin layer[J].Journal of tribology,1973,95(3):381-385.
[9]ROY L,LAHA SK.Steady state and dynamic characteristics of axial grooved journal bearings[J].Tribology international,2009,42(5):754-761.
[10]邓玫,孙军,符永红,等.计及轴受载变形的粗糙表面轴承热弹性流体动力润滑分析[J].机械工程学报,2010,46(15):95-101.DENG Mei,SUN Jun,FU Yonghong,et al.Thermoelastohydrodynamic lubrication analysis of bearing consider shaft deformation and surface roughness[J].Journal of mechanical engineering,2010,46(15):95-101.(in Chinese)
[11]CABRERA D L,WOOLLEY N H,ALLANSON D R,et al.Film pressure distribution in water-lubricated rubber journal bearings[J].Journal of engineering tribology,2005,219(2):125-132.
[12]黄蕾,腾勤,孙军.多功能滑动轴承试验台测控系统设计[J].机械设计与研究,2013,29(3):92-96.HUANG Lei,TENG Qin,SUN Jun.Design of measurement and control system for multi-functional journal bearing test bed[J].Machine design and research,2013,29(3):92-96.(in Chinese)
[13]DIMOND T,ROCKWELL R D,SHETH P N,et al.A new fluid film bearing test rig for oil and water bearings[C]//Proceedings of the ASME Turbo Expo 2008:Power for Land,Sea,and Air,2008.
[14]刘慧.传动轴轴心轨迹测量技术研究[D].哈尔滨:哈尔滨工程大学,2011.
[15]张国渊,袁小阳,苗旭升,等.水润滑高速动静压轴承试验研究[J].摩擦学学报,2006,26(3):238-241.ZHANG Guoyuan,YUAN Xiaoyang,MIAO Xusheng,et al.Experimental for water-lubricated high-speed hydrostatic journal bearing[J].Journal of tribology,2006,26(3):238-241.(in Chinese)