流变模型对航空润滑油拖动系数计算的影响

模拟航空发动机轴承多种工况，测量了润滑油的拖动系数，并利用多种流变模型对拖动系数进行了理论计算。结果表明：弹流工况下，航空润滑油在滑滚比较小时表现为黏弹性,滑滚比较大时表现为黏性;流变模型的选择对于拖动系数的计算结果具有重要影响;不适合采用牛顿模型来预测弹流工况下润滑油的拖动系数;目前为止，在整个工况范围内采用Johnson-Tevaarwerk模型预测润滑油的拖动系数精度较高，但热效应较显著时预测热效应区的拖动系数有较大误差，该模型还需进一步完善。

Influence of Rheological Model on Computation of Traction Coefficient of Aviation Lubricating Oils

The traction coefficients of several aviation lubricating oils are measured at various operating conditions simulating an aviation engine bearing on a self-made test rig.The predicted values of traction coefficients are calculated by various rheological models including the Newtonain model,Erying model,and Johnson-Tevaarwerk model.The results show that aviation lubricating oils behave visco-elastic at small slide-to-roll ratios and behave viscous at large slide-to-roll ratios in the condition of elastohydro...