The articulated cast iron piston is used to spray cooling the bottom of the piston. The bottom of the cylinder head and the upper part of the cylinder cover are provided with a cooling oil chamber on the circumference of the cylinder. The heat balance test of the El oil-cooled diesel engine that processes the cooling oil passage in the bridge area of ​​the nose shows that its cooling and heat loss ratio is equal to that of the equivalent row. The heat loss of the water-cooled diesel engine is reduced by the right amount. At the same time, the combustion chamber parts have good reliability. The influence of wall temperature on the working process and performance index of diesel engine To reduce the cooling and heat dissipation of the combustion chamber parts, the wall temperature of the combustion chamber can be increased and the uniform temperature can be obtained by changing the structural design and cooling conditions within the allowable temperature range of the material thermal strength. distributed. However, the wall temperature will have an impact on the working process in the cylinder, thus affecting the performance indicators of the diesel engine and affecting the inflation efficiency.
As the wall temperature of the combustion chamber increases, the air-injection coefficient of the diesel engine decreases. In the case of the maximum fuel injection quantity, due to the decrease of the excess air coefficient, the mixture becomes rich, the combustion is incomplete, and the smoke increases. Therefore, the maximum output power is limited when the small amount of oil, the excess air coefficient is large, and combustion is complete. Reduced heat loss reduces fuel consumption. The naturally aspirated single-cylinder tester uses the change curve of fuel consumption rate before and after inlaying the piston. The impact on the combustion process. When the temperature of the wall rises, the ignition delay period of the diesel engine is shortened, and the amount of fuel mixture formation during the non-steady combustion period is small. The initial heat release rate decreases, and the pressure increase rate is low and soft. Increased wall temperature helps power. The fuel consumption curve before and after insulation is mixed with fuel atomization.
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