DMEへのメタノール添加によるHCCI機関の着火時期遅延機構の検証(熱工学,内燃機関,動力など)

概要

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Controlling ignition timing in Homogenous Charge Compression Ignition (HCCI) of Dimethyl Ether by adding methanol has been studied in a motored engine. Reduction of heat release at cool flame and consequent delay of ignition timing with the methanol addition were confirmed. In exhaust gas analysis conducted mainly in single cool flame condition, fuel consumption decreases and formaldehyde formation increases with increasing methanol addition. It was found that these functions are independent of equivalence ratio when the three variables are expressed relative to initial fuel load. These behaviors were well reproduced by simulations using Curran's mechanism, whereas a small extent of underestimation of the cool flame heat release was suggested. A simplified model accounting for the additive effect was constructed by extracting the essential chemical mechanism, in which HCHO+OH and methanol+OH reactions are responsible for the termination of the chain reaction mechanism of DME low temperature oxidation.
社団法人日本機械学会の論文
2004-09-25