Effect of Ambient Pressure and Injection Pressure on Mixture Formation of Diesel Spray


In a direct injection diesel engine, ambient pressure in the combustion chamber tends to increase because of high boost and high EGR ratio. It seems that mixing process under extremely high compressed air condition such as high boost engine might be different from that under the conventional engine condition. In this study, time-resolved particle image velocimetry (PIV) was applied to velocity measurement inside a spray, and effect of ambient pressure and injection pressure on mixture formation of fuel and air was investigated. As the results, it was clear that spray width increased with increasing ambient gas density and injection pressure. Moreover local position of mixing layer shifted from periphery to spray inside with an increase of ambient gas density and injection pressure. 近年ディーゼルエンジンでは高過給により燃焼室内の雰囲気圧力が上昇する傾向にあり,燃料噴霧と周囲空気との混合気形成が従来の自然吸気エンジンと異なると考えられる.そこで本研究では時系列PIV法により噴霧内部の速度分布を解析し,雰囲気圧力と燃料噴射圧力が混合気の形成に及ぼす影響について調査した.


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  • Accession Number: 01673512
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Jan 31 2018 3:24PM