雰囲気酸素濃度・温度分布の不均一性がディーゼル燃焼に及ぼす影響 : 第2報,温度の不均一性の影響(熱工学,内燃機関,動力など)  [in Japanese] A Study on Effect of Heterogeneity of Oxygen Concentration and Temperature Distributions in a Combustion Chamber on Diesel Combustion : 2nd Report, Effect of Heterogeneity of Temperature on Diesel Combustion(Thermal Engineering)  [in Japanese]

In order to clarify the effect of heterogeneity of distributions of temperature and oxygen concentration in a combustion chamber induced by EGR on the soot and NO emissions from the diesel engine, the combustion characteristics of diesel spray flame achieved in a rapid compression and expansion machine (RCEM) at various patterns of temperature distribution in the chamber are investigated. The distribution of surrounding gas temperature in a chamber is controlled by changing the location, phase, and duration of EGR gas injection with multi-port intake system. The multi-port intake system can make the circler distributions of gas temperature with different gradient. NO and soot emissions are measured at different temperature distributions. Results indicate that the NO_x and soot emissions from diesel combustion are governed mainly by the amount of enthalpy entrained into the spray upstream the ignition region, when the temperature distribution in a chamber is changed with keeping the oxygen fraction at constant.