有限长线接触非牛顿热弹流润滑分析

A Thermal EHL Model for Finite Line Contact with Non-Newtonian Fluids

建立有限长圆柱滚子的非牛顿流体热弹流润滑模型,选取Ree-Eyring流体和Power-Law流体进行有限长线接触弹流润滑分析。研究表明:随着接触线长度增大,端部效应减弱;Ree-Eyring流体特征剪切力对润滑温升和剪切力影响较大,而对润滑压力与膜厚影响甚微;Power-Law流体随指数增大,润滑膜厚明显降低;随载荷、转速升高,热解与等温润滑结果差异增大,热效应对摩擦因数的影响尤其显著。

A thermal elastohydrodynamic lubrication （TEHL） finite line contact model was proposed for a cylindrical roller with Ree-Eyring fluid and Power-Law fluid. The results show that with the increase of contact line length, end effect is decreased. The Eyfing shear stress for Ree-Eyring fluid has a great influence on the temperature rise and shear stress, while has a little influence on the pressure and film thickness. For Power-Law fluid, the film thickness is decreased dramatically with the increase of Power-Law exponent. Compared with the isothermal results, the thermal results are quite different with the increase of load and speed, and there is a more significant influence on friction coefficient for thermal effects.