異なる酸化反応機構を持つ燃料の組み合わせによるHCCI燃焼の運転範囲拡大(熱工学,内燃機関,動力など)

概要

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HCCI combustion characteristics of mixed fuels with different ignitability, toluene/DME, were investigated. Toluene is thermally stable with a high oxidation onset temperature, whereas DME has good ignitability with active low temperature oxidation reactions. Engine test was conducted using a single cylinder, naturally-aspirated test engine to determine the HCCI operating range. Numerical calculations with elementary reaction models were also made to analyze the ignition and combustion mechanisms of toluene/DME HCCI process. The engine test showed that the operation range extended to higher loads without knocking, when DME quantity is adjusted an equivalence ratio of 0.1, the minimum requirements for ignition. The maximum load of φ0.77 in total equivalence ratio and BMEP of 0.59MPa was achieved. An elementally reaction model used in chemical analysis was on the basis of both Emdee's toluene oxidation scheme and Curran's DME2000 scheme. It was shown that when DME coexisted, the toluene oxidation temperature decreased to a low temperature at which single toluene would not react. In this temperature range, toluene oxidation is totally controlled by OH supplied from DME low temperature mechanism. The subsequent excursive hot fame reaction is restrained because toluene oxidation proceeds in stages depending on a temperature rise.
2010-10-25