共轨高压油泵柱塞微运动特性仿真分析研究
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摘要
基于结构动力学与流体动力润滑理论,建立柱塞副微运动过程的动力学模型,数值求解了工作过程中柱塞偏移、倾斜的微运动特性,并进一步获得了柱塞最大升程、柱塞副初始密封长度、初始间隙等参数对柱塞微运动特性的影响规律分析,提出了原模型的改进方案。计算结果表明:增加柱塞的最大升程会使偏移量增大而倾斜角变小;适当增加柱塞副初始密封长度及减小初始间隙有利于减小柱塞偏移量及倾斜角,改善柱塞的微运动特性。通过对原模型优化改进可使柱塞最大偏移量和倾斜角减小约50%。
Based on the structural dynamics and hydrodynamic lubrication theory,a kinetic model of plunger and barrel assembly was established,and the micro motion characteristics of plunger offset and inclination were calculated.Moreover,the influences of the three key parameters of maximum lift,initial sealing length as well as initial clearance between the plunger and barrel on the micro motion of plunger were deeply investigated,and an improved model design was proposed.The calculation results show that when increasing the maximum lift,the plunger offset increases,but the inclination decreases.In addition,the proper increase of the initial sealing length and decrease of the initial clearance between the plunger and barrel leads to the reduction of the plunger offset and inclination,which improves the micro motion of the plunger.In the improved model,the maximum plunger offset and inclination can be reduced by half.
Based on the structural dynamics and hydrodynamic lubrication theory,a kinetic model of plunger and barrel assembly was established,and the micro motion characteristics of plunger offset and inclination were calculated.Moreover,the influences of the three key parameters of maximum lift,initial sealing length as well as initial clearance between the plunger and barrel on the micro motion of plunger were deeply investigated,and an improved model design was proposed.The calculation results show that when increasing the maximum lift,the plunger offset increases,but the inclination decreases.In addition,the proper increase of the initial sealing length and decrease of the initial clearance between the plunger and barrel leads to the reduction of the plunger offset and inclination,which improves the micro motion of the plunger.In the improved model,the maximum plunger offset and inclination can be reduced by half.
引文
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[2]QIAN D X,LIAO R D.Theoretical analysis and mathematical modelling of the high-pressure pump in the common rail injection system for diesel engines[J].Proc.IMechE,Part A:Journal of Power and Energy.2015,229(1):60-72.
[3]陈海明,胡新华,杨继隆,等.变粘度条件下柱塞摩擦副泄漏流量的计算[J].润滑与密封,2003(3):25-26.CHEN H M,HU X H,YANG J L,et al.Calculation of leakage flow rate of piston friction pair under condition of variable viscosity[J].Lubrication Engineering,2003(3):25-26.
[4]PELOSI M,IYANTYSYNOVA M.Heat transfer and thermal eastic deformation analysis on the piston/cylinder interface of axial piston machines[J].Journal of Tribology,2012,134(4):1-15.
[5]刘世军,雷天觉,刘红旗,等.高压往复轴动密封柱塞偏心率[J].清华大学学报(自然科学版),2000,40(8):25-27,31.LIU S J,LEI T J,LIU H Q,et al.Analysis about the plunger’s selfcentered performance of reciprocating units for high pressure generation[J].Journal of Tsinghua University(Science and Technology),2000,40(8):25-27,31.
[6]刘世军,雷天觉,刘红旗,等.柱塞微扰摆动对高压动密封的影响[J].润滑与密封,2001(2):16-18.LIU S J,LEI T J,LIU H Q,et al.The effect of minor swayed plunger on sealing performance of a high-pressure reciprocating system[J].Lubrication Engineering,2001(2):16-18.
[7]XU B,ZHANG J,YANG H,et al.Investigation on the radial micro-motion about piston of axial piston pump[J].Chinese Journal of Mechanical Engineering,2013,26(2):325-333.
[8]ZHANG B,XU B,XIA C,et al.Modeling and simulation on axial piston pump based on virtual prototype technology[J].Chinese Journal of Mechanical Engineering,2009,22(1):84-90.
[9]胡仁喜,苑士华,刘红宁,等.高压高速条件下柱塞副漏流场分析[J].农业机械学报,2009,40(4):221-226.HU R X,YUAN S H,LIU H N,et al.Analysis on the leaking flow field of the piston sector considering the high press and high velocity[J].Transactions of the Chinese Society for Agricultural,2009,40(4):221-226.
[10]金朝铭.液压流体力学[M].北京:国防工业出版社,1994.
[11]NDIAYE E,BAZILE F,NASRI D,et al.High pressure thermophysical characterization of fuel used for testing and calibrating diesel injection systems[J].Fuel,2012,98:288-294.
[12]张鹏顺,陆思聪.弹性流体动力润滑及其应用[M].北京:高等教育出版社,1995.
[13]ROARK J R.Formulas for stress and strain[M].New York:McGraw-Hill,1975.
[14]CHORAZEWSKI M,DERGAL F,SAWAYA T,et al.Thermophysical properties of normafluid(ISO 4113)over wide pressure and temperature ranges[J].Fuel,2013,105:440-450.
[15]王亚伟,吴楚,缪淼,等.轻型柴油机共轨系统高压泵CB18的开发[J].内燃机工程,2012,33(2):20-27.WANG Y W,WU C,LIAO M,et al.Development of model CB18high pressure pump of common rail system for duty diesel engines[J].Chinese Internal Combustion Engine Engineering,2012,33(2):20-27.