Effect of the Partial Heat Insulation of the Diesel Engine Combustion Chamber on Heat Transfer into the Cooling System

The article looks at recent results of the experimental study of the basic engine and the engine with partial heat insulation of the combustion chamber. Engine D246.9 (4ChN 11,0/12,5), which is planned to be used as an auxiliary power unit, was selected for the experimental study. The zirconium dioxide layer (0,15 mm) with nickel substrate was used for the heat insulation of the combustion chamber. The layer was applied to the valve, piston and the cylinder head surface. The heat insulation layer possesses a sufficient adhesion to the parts, consequently, no peeling or flaws occur. Findings of the research show the possibility of reducing the heat removal in the coolant and engine lubricating oil with a slight increase in fuel consumption. For this purpose, it is necessary to replace the film method of mixing with the volume method, as well as to optimize the design and tuning parameters of the diesel engine.

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