ディーゼル機関における燃焼に及ぼす燃料の噴射方向と壁面の影響

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  • Influences of Direction of Fuel Injection and Wall on the Combustion in a Diesel Engine
  • ディーゼル キカン ニ オケル ネンショウ ニ オヨボス ネンリョウ ノ フンシャ ホウコウ ト ヘキメン ノ エイキョウ

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The influences of direction of fuel injection and the temperature of combustion chamber wall on the ignition and combustion process in the swirl chamber of a Diesel engine was investigated by means of high-speed photographs synchronized with pressure diagrams. The summary of our results are as follows : (1) Ignition of the fuel is delayed by cooling effect of the wall. (2) Duration of combustion is prolonged by the concentration of fuel particles in the middle part of the chamber and the shortening of ignition delay as well as the increase of fuel adhering to the wall, which mitigates the rate of pressure rise due to combustion. (3) When fuel is injected along the wall, several features of combustion such as multiple ignition, blue flame combustion, and abnormal shortening of ignition delay are observed.

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