予混合圧縮着火過程における高温燃焼発生メカニズム(熱工学,内燃機関,動力など)

概要

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The transition process from cool flame to thermal flame in homogeneous charge compression ignition is discussed in this paper. It was confirmed in HCCI engine experiments using dimehtyl ether, n-heptane and n-decane as fuels that the heat release rate during transition process from the cool ignition to the thermal ignition exhibits linear shape in an Arrhenius plot, and activation energies are in agreement with that of H_2O_2 thermal decomposition reaction, regardless of the fuels. These features were not affected by methanol addition, which suppresses the cool ignition and retards the ignition timing, although the heat release rates were lowered. The results of simulation, using SENKIN in CHEMKIN II package with reaction mechanisms of Lawrence Livermore National Laboratory, were consistent with the experimental results. The mechanism in this process was explained quantitatively by thermal explosion theory, in which rate determining reaction is H_2O_2 thermal decomposition, assuming this reaction obeys an Arrhenius type rate constant, and considering OH reproduction process and the amount of heat release during fuel and intermediate species oxidation process.
社団法人日本機械学会の論文
2006-09-25