Fuel Design Concept for Robust Ignition Process in Compression Ignition Engines (Third Report)


The authors have analyzed ignition characteristics of each component of natural gas based on chemical kinetics, and proposed a fuel design concept for HCCI engines to achieve robust ignition. Ethane exhibits following three characteristics, a high heat release rate during the late stage of ignition process, a high anti-knocking property with an HCCI operation, and a low dependence of ignition delay times on O₂ concentration. In this study, effects of these three characteristics of ethane on expanding operating range of HCCI engines were investigated using methane-based blended fuels with EGR. Methane/ethane shows high ignition stability against a high EGR rate caused by the above third characteristic, and a high thermal efficiency with a maximum power caused by the above second characteristic.HCCI 機関の運転成立条件と,天然ガスの各成分の着火特性の関連について調査した.二成分メタンベース燃料を用いてEGR 条件下で実機運転を行い,CH<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> では,主にC2H6 の着火遅れの酸素濃度依存性が小さいことにより,EGR 限界が拡大すること,C2H6 の高い耐ノッキング性により,最高出力点での熱効率が高くなることを明らかにした.


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  • Accession Number: 01666823
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Apr 23 2018 4:47PM