確率過程論モデルによるディーゼル噴霧の着火過程の予測

概要

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To describe the ignition delay of diesel sprays, a stochastic model taking account of the endothermic process in the spray is proposed. In this model, generation of turbulence and turbulent mixing of fuel and air are taken into consideration. For the endothermic process, the rate of heat absorption due to vaporization and pyrolysis is assumed to be constant. Chemical reactions during the ignition delay period are expressed by a one-step global mechanism and ignition is assumed to occur when concentrations of active species exceed a threshold. It is shown that this model may reproduce the ignition delay of a diesel spray and pressure history in a rapid compression machine for a variety of conditions. Also, the ignition delay is dependent on spray formation at a high initial temperature, but on chemical reaction at a low initial temperature.
1999-10-25