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The current investigation delves into the thermal stresses encountered by internal combustion engine pistons during the combustion process and explores the impact of high heat transfer through metallic engine components. The study focuses on a thermal analysis of a diesel engine piston model, incorporating a semitransparent ceramic coating on its surface. The research simulates temperature profiles on both the top surface of the piston and its substrate. The model incorporates an internal heat source, its magnitude calculated based on the coating's heat radiation absorbance values. The investigation considers Aluminum, and Titanium ceramic-based coatings with varying heat flow duration. Comparative analysis involves assessing the results of the numerical solution of the heat equation, incorporating the internal heat source function derived from experimentally measured absorbance values of the coatings’ material. Unlike prior studies that primarily relied on evaluating temperature profiles based on ceramic coating thermoconductivity properties, this research highlights the interaction of heat flux with defined optical properties (absorbance) in the coating, imparting semitransparency. This property leads to heat accumulation within the coating. Simulation outcomes indicate that the absorbance-driven internal heat source significantly reduces heat transfer to the substrate compared to considerations based solely on thermoconductivity properties. The study introduces a mathematical model validated through numerical solutions of a differential equation of a semitransparent heat-insulating coating. The findings demonstrate the coating's ability to enhance heat reduction compared to coatings lacking heat radiation absorbance capabilities.
Gutierrez et al. (Wed,) studied this question.