直噴ディーゼル噴霧のスプリット噴射時のモデル燃焼室内における挙動　第１報　　スプリット噴射インターバルの影響

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  • Behaviors of D. I. Diesel Sprays with Split Injection in a Model Combstion Chamber. 1st Report, Effects of the Injection IntervaD.
  • チョクフンディーゼル フンム ノ スプリット フンシャジ ノ モデル ネンショウ シツナイ ニ オケル キョドウ ダイ1ポウ スプリット フンシャ インターバル ノ エイキョウ

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Split Injection has a potential to reduce simultaneously both NOχ and soot emissions from a D.I. Diesel engine. But the mechanisms of simultaneous reduction of both NOχ and soot emissions have not been clarified. To figure out the mechanism of change in emissions characteristics of the D.I. Diesel engine with the Split injection, an experimental study was conducted by using electrically controlled common rail injection system and a high pressure bomb. One of the sprays from a multi hole nozzle was injected into a two-dimensional model combustion chamber. The spray was observed by schliren photography with a high-speed video camera. In this report, effects of the injection interval under the fixed ratio of injected mass at each injection stage are described. The spray for the 2nd injection has larger tip penetration when the injection interval becomes short. And the height of the 2nd spray along the bottom wall of the model combustion chamber is shorter than 1st spray and single injected spray.

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