Evaporation Characteristics of Lubricant/Gasoline Blending Oil Film Under Different Thermal Radiations

The evaporation and pro-ignition characteristics of the lubricating oil blending in the cylinder can bring a super knock for the high-efficiency gasoline engine. The evaporation characteristics of the lubricant/gasoline blending oil film were investigated experimentally under different thermal radiative heat flux, film thickness, and carrier material in a radiation device. The blending ratios of lubricant/gasoline oil film changed from 0% to 15%. Three stages of the blending oil film evaporation process were observed according to the different evaporation rates, namely, transient heating, equilibrium evaporation, and evaporation gel. During the transient heating stage, with the increase of gasoline blending ratio, oil film thickness, and radiative heat flux, the evaporation rate increases, while the evaporation rate decreases in the equilibrium evaporation stage. The evaporation rates in transient heating stage and equilibrium evaporation stages are reasonably predicted by using the proposed relationship model.