考虑毛细流动效应的微型柱塞泵自吸性能研究
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摘要
微型柱塞泵是微型液压驱动系统的核心部分。由于微型柱塞泵进出管和配流阀流道小,使得在研究微型柱塞泵自吸性能时,除了流体重力、惯性力和黏性力外,还要考虑毛细流动效应对微型柱塞泵自吸性能的影响。在对比了流体黏度、管径和浸润角等因素后,对微型柱塞泵自吸过程进行了理论分析。结果表明,微型柱塞泵自吸性能受流体重力、惯性力、黏性力和毛细流动效应共同作用影响,并且在不同管径、流体黏度和浸润角下,各种力的影响程度不同。
A micro-plunger pump is the core part of micro-hydraulic drive system as a micro-power source. Because inlet-outlet pipes and distributing valve channels of micro-plunger pump are small,when considering self-priming performance of micro-plunger pump,in addition to fluid gravity,inertial force and viscosity,the influence of capillary flow effect on self-priming performance of micro-plunger pump must be considered. We analyze the selfpriming process of micro-plunger pump theoretically after comparing the factors such as fluid viscosity,diameter and contact angle. The results show that the self-priming performance of micro plunger pump is influenced by the fluid gravity,inertial force,viscous force and capillary flow effect,and the influence degree of various forces is different under different pipe diameters,fluid viscosity and infiltration angle.
A micro-plunger pump is the core part of micro-hydraulic drive system as a micro-power source. Because inlet-outlet pipes and distributing valve channels of micro-plunger pump are small,when considering self-priming performance of micro-plunger pump,in addition to fluid gravity,inertial force and viscosity,the influence of capillary flow effect on self-priming performance of micro-plunger pump must be considered. We analyze the selfpriming process of micro-plunger pump theoretically after comparing the factors such as fluid viscosity,diameter and contact angle. The results show that the self-priming performance of micro plunger pump is influenced by the fluid gravity,inertial force,viscous force and capillary flow effect,and the influence degree of various forces is different under different pipe diameters,fluid viscosity and infiltration angle.
引文
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[2]李红,姜波,陆天桥.泵自吸过程气液两相流的可视化试验[J].农业机械学报,2015,46(8):59-65.LI Hong,JIANG Bo,LU Tianqiao.Visualization Experiment of Gas-liquid Two-phase Flow of Pump During Selfpriming Process[J].Transactions of the Chinese Society for Agricultural Machinery,2015,46(8):59-65.
[3]陈淑梅,颜滨曲,陈传铭.轴向柱塞泵功率密度影响因素分析[J].农业机械学报,2015,46(6):355-362.CHEN Shumei,YAN Binqu,CHEN Chuanming.Analysis of Factors Influencing Power Density for Axial-piston Pump[J].Transactions of the Chinese Society for Agricultural Machinery,2015,46(6):355-362.
[4]李红,徐德怀,涂琴,等.自吸泵启动过程气液两相流动的数值模拟[J].农业工程学报,2013,29(3):77-82.LI Hong,XU Dehuai,TU Qin,et al.Numerical Simulation on Gas-liquid Two-phase Flow of Self-priming Pump During Starting Period[J].Transactions of the Chinese Society of Agricultural Engineering,2013,29(3):77-83.
[5]王秀霞,刘湘一,刘书岩,等.自吸能力对柱塞泵性能校验的影响研究[J].液压与气动,2012,(10):82-83.WANG Xiuxia,LIU Xiangyi,LIU Shuyan,et al.Influnce of Self-priming on the Performance of Piston Pump[J].Chinese Hydraulics&Pneumatics,2012,(10):72-83.
[6]ERIK Schaffer,POZEN Wong.Dynamics of Contact Line Pinning in Capillary Rise and Fall[J].Phys.Rev.Lett,1998,80(140):3069-3072.
[7]NARAYAN O,FISHER D S.Dynamics of Sliding Chargedensity Waves in 4-epsilon Dimensions[J].Phys.Rev.Lett,1992,68(24):3015-3018.
[8]LUCAS R.Rate of Capillary Ascension of Liquids[J].Kolloid.Z,1918,23(2):15-22.
[9]WASHBURN E W.The Dynamics of Capillary Flow[J].Phys.Rev,1921,17(3):273-283.
[10]HAGEN G.Movement of Water in a Narrow Cylindrical Tube[J].Ann Phys.Chen,1839,46(2):423-442.
[11]POISEUILLE J L.Recherches Expérimentales Surle Mouvement Des Liquides Dans les Tubes de Très-petits Diamètres[J].Comptes Rendus,1841,(11):961.
[12]DAVID Q,ELIE Raphael.Rebounds in a Capillary Tube[J].Langmuir,1999,15(10):3679-3682.