摩托车液压减震器内部三维瞬态流场的研究  

Research of Instantaneous Flow Field for Motorcycle's Hydraulic Shock Absorber

作　　者：仲敏波[1] 单春贤[1] 吉恒松[1] 凌新 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013 [2]312国道镇江段公路管理站

出　　处：《小型内燃机与摩托车》2010年第4期36-39,60,共5页Small Internal Combustion Engine and Motorcycle

基　　金：江苏省高校自然科学基金资助项目(05KJB470021)

摘　　要：用CFD方法对摩托车液压减震器的内部流场进行了三维数值模拟。在参照某实际减震器结构和参数的基础上进行简化,用GAMB IT建立了三维几何模型并进行了网格的划分、细化。计算采用Re-alizable湍流模型并使用自定义函数UDF定义进口速度,通过仿真,获得了不同时刻下筒内的瞬时速度分布以及对应的总压分布图。结果表明,筒内流体运动速度越大,通过阻尼孔的液体速度也越大,阻尼孔前后两端的压力差也越大,活塞受到的阻尼力也越大。阻尼孔直径的改变对内部流场的影响,表现为随着阻尼孔直径减小,筒内湍流强度增强,减震效果呈指数型增强。The internal flow field for motorcycle＇s hydraulic shock absorber was simulated with CFD technique.The 3-D geometric model was simplified and established according to the parameters and structure of the practical shock absorber.The mesh of the model was generated and fractionized by GAMBIT.Realizable k-ε turbulence model was given and the inlet velocity was given by self-defined function UDF.The instantaneous velocity and the total pressure for the internal flow field of shock absorber at different times were obtained through simulation.With the increase of inner fluid velocity,the velocity through holes increases,the pressure difference before and after holes increases,the damping force to piston increases.The internal flow field is influenced when the diameter of hole changed.With the decrease of diameter,the inner turbulence intensity increases and the effect of damping exponentially increases.

关 键 词：摩托车 减震器 瞬时流动 内部流场 数值模拟 湍流 

分 类 号：U483[交通运输工程—载运工具运用工程]