Aiming at the heat transfer problem of diesel engine, the research status of low-heat engine at home and abroad in recent years is reviewed and analyzed from the aspects of heat transfer process and external cooling measures in the combustion chamber parts. The results show that the diesel engine transmission is reduced. Heat loss can improve the thermal efficiency of the diesel engine and improve the economics of the diesel engine. Introduction to Diesel Engine Heat Transfer With the continuous development of internal combustion engine combustion technology, the cycle efficiency of internal combustion engines has been continuously improved. The theoretical cycle of the internal combustion engine indicates that increasing the temperature difference between the high temperature portion and the low temperature portion of the cycle will help to improve the cycle efficiency of the engine. However, it is very difficult to further reduce the exhaust gas temperature. Therefore, we usually improve the engine wall temperature, reduce the heat loss and increase the maximum operating temperature of the engine, thereby improving the thermal efficiency of the engine, thus producing a research on a low-heat engine. In the past ten years, due to the development of high temperature lubrication and high temperature cooling of high temperature resistant ceramic materials, the research of low heat dissipation engines has been promoted. It can be seen from a large number of research results at home and abroad that the basic means of realizing a low-heating engine is the insulation of the combustion chamber components, reducing or eliminating the cooling system of the engine. After exhaust gas turbocharging, part of the exhaust gas energy is recovered, and the excess air in the cylinder is increased, the working medium absorbs heat and increases the power, and the relative heat dissipation area decreases, so that the heat loss ratio decreases. With adiabatic composite turbocharging, the heat loss is greatly reduced, although the exhaust gas energy is increased, but the total energy recovered. For the naturally aspirated engine, appropriate measures are taken to reduce the heat loss, and the economic improvement is also obtained. It can be seen that reducing the heat dissipation of the engine is one of the effective means for improving the thermal efficiency of the engine. The impact of the heat insulation method of the combustion chamber parts on the economic performance There are various ways to insulate the combustion chamber parts of the diesel engine. It includes the whole engine parts made of high-temperature structural ceramics, ceramic blocks embedded in the combustion chamber parts, and the surface of the combustion chamber parts. The ceramic layer is sprayed, and the air gap is used to generate heat insulation in the combined structure, and the heat transfer path is changed by changing the geometry of the part. In a diesel engine, which method is adopted will depend on the requirements of the diesel engine insulation and the reliability of the structure.
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