Abstract
“Temperature swing” by heat insulation coating is a technology developed to reduce heat loss in diesel engines. The purpose of this study is to evaluate the fuel film thickness formed on the piston surface with heat insulation coating. A 1-dimensional heat transfer model is developed and the inside temperature distribution of the piston at the compression TDC of the first cycle of a diesel engine during cold start is estimated. The inside temperature distribution of the piston can be reproduced by instantaneous heating with a pulsed laser. The fuel film thickness is evaluated by applying the refractive index matching (RIM) method. When the piston is instantaneously heated with the pulsed laser, the fuel film thickness decreased by 15 % compared to no heating condition.
