润滑管道内油气两相流压力脉动特性分析
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摘要
润滑油在工作过程中经常会由于自身溶解或外部进入空气而产生气泡,影响其润滑特性。因此,研究润滑系统中的气液两相流动特性具有重要意义。为了解含气润滑油在流动过程中的压力脉动特性,本文采用ANSYS_CFX对一润滑管道实验装置内油气两相流动进行数值模拟,将不同工况下的压力计算结果与实验数据作对比,验证了数值计算方法的合理性,然后分析了管道不同位置的压力脉动以及流量对压力脉动的影响。计算结果表明,流动开始,油与空气的分界面受到扰动使得空气逐渐进入油中,形成油气两相流;沿着流动方向,管道截面上的平均压力的脉动振幅先增大后减小,最大值位于紧邻泵出口的监测面;两相流动中气泡受泵的搅拌作用破碎形成连续且均匀的小气泡,使出口管道内流动所受冲击更小,压力脉动相对较小;随着流量增加,压力脉动的周期减小,振幅增大。
During the operation process, there are always bubbles arising in the lubricating oil due to its own dissolution or external entry of air, which will influence its lubricating performances, thus, it's significant to study the liquid-gas two-phase flow in lubrication systems. To explore the pressure fluctuation characteristics in the flow of lubricating oil with air, an unsteady simulation is carried out with ANSYS_CFX for oil-air two-phase flow in a lubricating pipeline system, and the reliability of the simulation is verified by comparing pressure data of different conditions with the experiment data. It turns out that, at the beginning, the interface between oil and air is destroyed by the disturbance of the flow and air is sucked into the oil to form the oil-gas two-phase flow; the pressure fluctuation at different sections of the pipe and the effects of flux on it are analysed. The results demonstrate that the fluctuation amplitudes of the average pressures on the pipe sections firstly increase and then decrease, along the streamwise direction with the maximum located near the outlet of the pump; the bubbles are broken into continuous and uniform small bubbles by the stirring effect of the pump, which weakens the strike of the flow in the outlet pipe, as a result, the fluctuation amplitude here is relatively small; as the flow rate enlarges, the period of pressure fluctuation decreases and amplitude increases.
During the operation process, there are always bubbles arising in the lubricating oil due to its own dissolution or external entry of air, which will influence its lubricating performances, thus, it's significant to study the liquid-gas two-phase flow in lubrication systems. To explore the pressure fluctuation characteristics in the flow of lubricating oil with air, an unsteady simulation is carried out with ANSYS_CFX for oil-air two-phase flow in a lubricating pipeline system, and the reliability of the simulation is verified by comparing pressure data of different conditions with the experiment data. It turns out that, at the beginning, the interface between oil and air is destroyed by the disturbance of the flow and air is sucked into the oil to form the oil-gas two-phase flow; the pressure fluctuation at different sections of the pipe and the effects of flux on it are analysed. The results demonstrate that the fluctuation amplitudes of the average pressures on the pipe sections firstly increase and then decrease, along the streamwise direction with the maximum located near the outlet of the pump; the bubbles are broken into continuous and uniform small bubbles by the stirring effect of the pump, which weakens the strike of the flow in the outlet pipe, as a result, the fluctuation amplitude here is relatively small; as the flow rate enlarges, the period of pressure fluctuation decreases and amplitude increases.
引文
[1]罗先伟.油气两相流流变特性研究[D].北京:北京理工大学, 2016.LUO Xianwei. Study on rheology of oil-gas two-phase flow[D].Beijing:Beijing Institute of Technology, 2016.
[2]王建文,安琦.油气润滑输送中两相流的形成[J].华东理工大学学报, 2009, 35(2):324-327.WANG Jianwen, AN Qi. Investigation of two-phase flow regimes in transport pipe in oil-air lubrication system[J]. Journal of East China University of Science and Technology, 2009, 35(2):324-327.
[3]吴昊天,陈国定.轴承腔油气两相泡状流动的数值研究[J].机械工程学报, 2008, 44(9):70-75.WU Haotian, CHEN Guoding. Numerical research on two-phase gas/oil bubble flow in bearing chamber[J]. Chinese Journal of Mechanical Engineering, 2008, 44(9):70-75.
[4]张坻,李孔清,王嘉.气液两相流噪声数值模拟[J].矿业工程研究,2017, 32(1):71-78.ZHANG Chi, LI Kongqing, WANG Jia. Numerical simulation of gasliquid two-phase flow noise[J]. Mineral Engineering Research, 2017,32(1):71-78.
[5]陈辉.压力机液压系统中振动噪声的分析与控制[D].武汉:武汉理工大学, 2013.CHEN Hui. Analysis and control of vibration noise in hydraulic system of pressure machine[D]. Wuhan:Wuhan University of Technology,2013.
[6] HANAFIZADEH P, ESHRAGHI J, TAKLIFI A. Experimental identification of flow regimes in gas-liquid two phase flow in a vertical pipe[J]. Mecccanica, 2016, 51(8):1771-1782.
[7]白博峰,郭烈锦,陈学俊.气液两相流压力波动特性[J].水动力学研究与进展, 2003, 18(4):476-482.BAI Bofeng, GUO Liejin, CHEN Xuejun. Pressure fluctuation for airwater two-phase flow[J]. Journal of Hydrodynamics, 2003, 18(4):476-482.
[8]何利民,郭烈锦,陈学俊.测量水平管道液塞速度和长度的差压波动分析法[J].化工学报, 2003, 54(12):192-198.HE Limin, GUO Liejin, CHEN Xuejun. Measurement of slug velocity and length in horizontal pipeline by means of differential pressure fluctuation analysis[J]. CIESC Journal, 2003, 54(12):192-198.
[9] KABIRI A, BORGHEI S, SANDI M. Fluctuation of air-water twophase flow in horizontal and inclined water pipelines[J]. Journal of Fluids Engineering, 2007, 129(1):1-14.
[10] DINARYANTO O, MAJID A, HUYADA A. Experimental investigation on the initiation and flow development of gas-liquid slug two-phase flow in a horizontal pipe[J]. Experimental Thermal&Fluid Science,2017, 81:93-108.
[11] ZHANG Lühong, GAO Guohua. CFD simulation and experimental validation of fluid flow in pre-distributor[J]. Chinese Journal of Chemical Engineering, 2011, 19(5):115-120.
[12] ZHANG Wenwu, YU Zhiyi, ZHU Baoshan. Influence of tip clearance on pressure fluctuation in low specific speed mixed-flow pump passage[J]. Energies, 2017, 10(2):1-16.
[13] ZHANG Wenwu, YU Zhiyi, MUHAMMAD N, et al. Study of the gas distribution in a multiphase rotodynamic pump based on interphase force analysis[J]. Energies, 2018, 11(5):1-14.
[14]孟玉婵,刘文凯,徐平.我国运行汽轮机油标准的发展与现状[J].润滑油, 2006, 21(5):1-9.MENG Yuchan, LIU Wenkai, XU Ping. Development and present situation on criteria of turbine oils in services of China[J]. Lubricating Oil, 2006, 21(5):1-9.
[2]王建文,安琦.油气润滑输送中两相流的形成[J].华东理工大学学报, 2009, 35(2):324-327.WANG Jianwen, AN Qi. Investigation of two-phase flow regimes in transport pipe in oil-air lubrication system[J]. Journal of East China University of Science and Technology, 2009, 35(2):324-327.
[3]吴昊天,陈国定.轴承腔油气两相泡状流动的数值研究[J].机械工程学报, 2008, 44(9):70-75.WU Haotian, CHEN Guoding. Numerical research on two-phase gas/oil bubble flow in bearing chamber[J]. Chinese Journal of Mechanical Engineering, 2008, 44(9):70-75.
[4]张坻,李孔清,王嘉.气液两相流噪声数值模拟[J].矿业工程研究,2017, 32(1):71-78.ZHANG Chi, LI Kongqing, WANG Jia. Numerical simulation of gasliquid two-phase flow noise[J]. Mineral Engineering Research, 2017,32(1):71-78.
[5]陈辉.压力机液压系统中振动噪声的分析与控制[D].武汉:武汉理工大学, 2013.CHEN Hui. Analysis and control of vibration noise in hydraulic system of pressure machine[D]. Wuhan:Wuhan University of Technology,2013.
[6] HANAFIZADEH P, ESHRAGHI J, TAKLIFI A. Experimental identification of flow regimes in gas-liquid two phase flow in a vertical pipe[J]. Mecccanica, 2016, 51(8):1771-1782.
[7]白博峰,郭烈锦,陈学俊.气液两相流压力波动特性[J].水动力学研究与进展, 2003, 18(4):476-482.BAI Bofeng, GUO Liejin, CHEN Xuejun. Pressure fluctuation for airwater two-phase flow[J]. Journal of Hydrodynamics, 2003, 18(4):476-482.
[8]何利民,郭烈锦,陈学俊.测量水平管道液塞速度和长度的差压波动分析法[J].化工学报, 2003, 54(12):192-198.HE Limin, GUO Liejin, CHEN Xuejun. Measurement of slug velocity and length in horizontal pipeline by means of differential pressure fluctuation analysis[J]. CIESC Journal, 2003, 54(12):192-198.
[9] KABIRI A, BORGHEI S, SANDI M. Fluctuation of air-water twophase flow in horizontal and inclined water pipelines[J]. Journal of Fluids Engineering, 2007, 129(1):1-14.
[10] DINARYANTO O, MAJID A, HUYADA A. Experimental investigation on the initiation and flow development of gas-liquid slug two-phase flow in a horizontal pipe[J]. Experimental Thermal&Fluid Science,2017, 81:93-108.
[11] ZHANG Lühong, GAO Guohua. CFD simulation and experimental validation of fluid flow in pre-distributor[J]. Chinese Journal of Chemical Engineering, 2011, 19(5):115-120.
[12] ZHANG Wenwu, YU Zhiyi, ZHU Baoshan. Influence of tip clearance on pressure fluctuation in low specific speed mixed-flow pump passage[J]. Energies, 2017, 10(2):1-16.
[13] ZHANG Wenwu, YU Zhiyi, MUHAMMAD N, et al. Study of the gas distribution in a multiphase rotodynamic pump based on interphase force analysis[J]. Energies, 2018, 11(5):1-14.
[14]孟玉婵,刘文凯,徐平.我国运行汽轮机油标准的发展与现状[J].润滑油, 2006, 21(5):1-9.MENG Yuchan, LIU Wenkai, XU Ping. Development and present situation on criteria of turbine oils in services of China[J]. Lubricating Oil, 2006, 21(5):1-9.
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