Evaluation of the efficiency of thermal insulation of the combustion chamber according to the load characteristics of a diesel engine

Abstract Prospects for the development of diesel engine building are seen in a consistent increase in specific indicators due to forcing on the average effective pressure with a simultaneous decrease in the loss of fuel combustion heat, thermal insulation of the combustion chamber and the use of exhaust gas energy. All these measures are taken to bring the real thermodynamic cycle closer to the theoretical adiabatic cycle. This explains the appearance of the terms adiabatic, semiadiabatic, partially adiabatic, and even superadiabatic. The existing estimates of the effectiveness of thermal insulation of diesel combustion chambers in terms of the level of adiabatization of the thermodynamic cycle were based on qualitative rather than quantitative indicators, as a result of which the achieved effects were interpreted by various researchers ambiguously. The introduction of uniformity in the methods, indicators and quantitative criteria for evaluating the efficiency of using the heat of combustion of fuel in the working cycle of a diesel engine makes it possible to determine not only the achieved level, but also to predict the future development of the engine building industry, which confirms the relevance of the problem.

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