Abstract
It is unavoidable that a DI diesel engine exhausts a blue and white smoke at starting, especially in the cold atmosphere. In the report presented here, a small DI diesel engine was started under the conditions of the coolant and suction air whose minimum temperatures were -18°C and -5°C, respectively. The flame was photographed by high-speed photography, the temperature of flame and the soot concentration were measured by two-color method, and CO2 concentration was detected by the luminous method. The engine cannot be started over several cycles when the coolant temperatures of coolant and suction air are decreasing, the maxima of the cylinder pressure, flame temperature, soot concentration and CO2 concentration are decreasing. Luminous small dots or a small lump of flame become scattered in the piston cavity.
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