Abstract
To improve the power and fuel and economic performance of a gasoline internal combustion engine, it has been proposed to improve the insulating properties of the piston by forming a heat-insulating coating on the working surfaces of the piston head with a thickness of 25...30 μm using the microarc oxidation method. Comparative results of engine tests are carried out, which showed that an engine equipped with pistons with a heat-insulating coating on the working surfaces of the head increases power by 5.3 % and reduces hourly fuel consumption by 5.7 % compared to an engine equipped with standard pistons.
Highlights
IntroductionThe current state of development of contemporary engine building is characterized by the fact that designers’ pay special attention to a forced flow of gasdynamic, thermal, power and strength modes of the engine performance
The current state of development of contemporary engine building is characterized by the fact that designers’ pay special attention to a forced flow of gasdynamic, thermal, power and strength modes of the engine performance. These modes are accompanied by a further increase in the thermal density of the main components that form the combustion chamber, which is caused by a change in the flow of the working process and engine performance
It has been found that in the engine building practice various methods are used to reduce the thermal stress of internal combustion engine (ICE) pistons
Summary
The current state of development of contemporary engine building is characterized by the fact that designers’ pay special attention to a forced flow of gasdynamic, thermal, power and strength modes of the engine performance. It is known that for thermal protection of the working surfaces of the piston top and cylinder head of a twostroke internal combustion engine (ICE), pistons and cylinder heads with a thermal insulating oxide ceramic coating 0.06 mm thick were used This made it possible to reduce heat removal from the working surfaces of parts, to reduce the specific fuel consumption by 3.2 % and increase the maximum engine power by 6 % [4]. As a result of bench tests of the D65NT1 diesel engine equipped with pistons with a corundum layer and a Teflon coating of friction surfaces, a decrease in fuel consumption by 5.1 % was established, an increase in developed power from 44.72 kW to 46.7 kW, i.e. by 4.4 % This was due to a decrease in total thermal and mechanical losses due to internal friction. The use of heat insulating coatings did not find further application to improve the insulating properties of the piston, power, fuel and economic performance of the engine, because in the process of operation, these coatings have two significant drawbacks: low adhesive strength on piston alloys and low heat resistance
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