燃油稀释对柴油机油性能影响规律研究

Influence of Fuel Dilution on the Performance of Diesel Engine Oil

以CK-415W40柴油机油为基础油,通过添加不同比例(质量分数分别为5%、10%、15%和20%)的0#柴油制备了不同燃油稀释比例的柴油机油,对稀释油品的基本理化性能(黏度、倾点、闪点和酸碱值)进行了测试.采用曲轴箱模拟试验仪、加压差示扫描量热试验仪、点接触光弹流润滑试验台以及SRV试验机对稀释前后油样进行了结胶性能、抗氧化性能、弹流润滑以及边界润滑性能进行了研究.结果表明:燃油稀释后的柴油机油黏度和闪点明显下降,倾点未发生明显变化,酸碱值和抗氧化性能有一定程度的降低.弹流润滑条件下发动机油的油膜厚度降低,同时燃油稀释后柴油机油在边界润滑条件下的减摩与抗磨性能有所下降.

Different fuel diluted engine oils were prepared by adding different proportions 0#diesel(5%,10%,15%,20%)into CK-415 W40 engine oil.Their physiochemical properties such as viscosity,pour point,flash point,total acid number and total base number were measured.Crankcase coking tester,pressure differential scanning calorimetry,optical interference point contact elastohydrodynamic lubrication tester as well as SRV tester were employed to investigate the coking,oxidation,elastohydrodynamic lubrication and boundary lubrication performances,respectively.Results show that viscosity and flash point experienced a drastic decrease with the increase of dilution rate and fuel dilution had a negligible effect on pour point.Total acid number,total base number and oxidation stability decreased to a certain degree.Film thickness of engine oil decreased with the increase of diesel concentration Friction reducing and anti-wear properties under boundary lubrication regime were also deteriorated with the addition of diesel.