液粘传动界面间油膜态数值模拟研究
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摘要
为了研究在软启动过程中,液粘调速离合器摩擦副间隙内油膜形态的演变机理,基于计算流体动力学理论,建立流体油膜的计算模型,并考虑油膜的粘温特性,采用Fluent软件对摩擦副间隙内的油膜流场进行求解,获得了油膜的多物理场分布。研究结果表明:界面间油膜的最大温升从油膜出口位置转移至油膜入口位置附近;油膜在中间位置及出口位置的温度和径向速度呈现出抛物线状分布;影响摩擦副间隙内油膜最大动压的主要因素是油膜厚度与主、被动片相对转速;油膜的粘性扭矩输出呈现先增加后减小的趋势,粘性扭矩峰值出现在启动初期。
The oil film state between friction pairs of hydro-viscous drive in the soft-start was researched in order to determine the change mechanism. Based on the CFD theory, the calculation model for the oil film was built, taking into account the effect of viscosity temperature characteristic. The flow between friction pairs was solved by using Fluent and the physical distribution of oil film was obtained accordingly. The research results show that the maximum temperature rise is transferred from the outlet to the inlet. The parabolic law can be speculated from the distribution of temperature and radial velocity at the intermediate position and the outlet. The main factors that affect the maximum dynamic pressure of oil film are film thickness and the relative velocity between the disks. The viscous torque increases rapidly and then declines slowly. The maximum viscous torque appears at the early stage of the soft-start.
The oil film state between friction pairs of hydro-viscous drive in the soft-start was researched in order to determine the change mechanism. Based on the CFD theory, the calculation model for the oil film was built, taking into account the effect of viscosity temperature characteristic. The flow between friction pairs was solved by using Fluent and the physical distribution of oil film was obtained accordingly. The research results show that the maximum temperature rise is transferred from the outlet to the inlet. The parabolic law can be speculated from the distribution of temperature and radial velocity at the intermediate position and the outlet. The main factors that affect the maximum dynamic pressure of oil film are film thickness and the relative velocity between the disks. The viscous torque increases rapidly and then declines slowly. The maximum viscous torque appears at the early stage of the soft-start.
引文
[1]魏宸官,赵家象.液体粘性转动技术[M].北京:国防工业出版社,1996.
[2]洪跃,刘谨,金士良.液粘调速离合器中摩擦副热效应的简化分析[J].润滑与密封,2003,(5):6-11.
[3]吕和生,林腾蛟,张世军,等.湿式多片摩擦离合器油路三维流场分析[J].中国机械工程,2009,20(16):1978-1982.
[4]张志刚,周晓军,等.湿式离合器动态接合特性的仿真与试验[J].中国公路学报,2010,23(3):115-120.
[5]孟庆睿,侯友夫.液体粘性调速起动瞬态过程数值模拟研究[J].摩擦学学报,2009,29(5):418-424.
[6]黄家海,邱敏秀,方文敏.液粘调速离合器中摩擦副间隙内流体传热分析[J].浙江大学学报,2011,45(11):1934-1940.
[7]谢方伟,侯友夫,等.液粘传动变形界面间油膜温度场实验研究[J].中南大学学报,2011,42(12):3722-3727.
[8]谢方伟,侯友夫.液体粘性传动变形摩擦副间油膜压力场[J].工程机械,2011,42(2):41-44.
[9]LAI Y G.Simulation of heat transfer characteristics of wet clutch engagement process[J].Numerical heat transfer.Part A,1998,33(6):583-597.
[2]洪跃,刘谨,金士良.液粘调速离合器中摩擦副热效应的简化分析[J].润滑与密封,2003,(5):6-11.
[3]吕和生,林腾蛟,张世军,等.湿式多片摩擦离合器油路三维流场分析[J].中国机械工程,2009,20(16):1978-1982.
[4]张志刚,周晓军,等.湿式离合器动态接合特性的仿真与试验[J].中国公路学报,2010,23(3):115-120.
[5]孟庆睿,侯友夫.液体粘性调速起动瞬态过程数值模拟研究[J].摩擦学学报,2009,29(5):418-424.
[6]黄家海,邱敏秀,方文敏.液粘调速离合器中摩擦副间隙内流体传热分析[J].浙江大学学报,2011,45(11):1934-1940.
[7]谢方伟,侯友夫,等.液粘传动变形界面间油膜温度场实验研究[J].中南大学学报,2011,42(12):3722-3727.
[8]谢方伟,侯友夫.液体粘性传动变形摩擦副间油膜压力场[J].工程机械,2011,42(2):41-44.
[9]LAI Y G.Simulation of heat transfer characteristics of wet clutch engagement process[J].Numerical heat transfer.Part A,1998,33(6):583-597.