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本文研究了轿车用非直喷式柴油机气缸内燃烧产生的碳烟微粒的形成和氧化。利用全气缸取样系统使气缸内工质迅速排出和稀释,并采集在取样袋中,随后用悬浮粒子电子分析仪进行分析,测定出在膨胀行程中燃烧室内碳烟微粒的质量浓度和表面积浓度随曲轴转角的变化历程。用麻省理工学院发展的随机模型模拟了实测的碳烟微粒曲线。利用Lee 和Beer的动力学公式可以模拟观测到碳烟微粒氧化率。碳烟微粒氧化率对用在模拟模型中设定的碳粒子直径值是非常敏感的。
This paper studies the formation and oxidation of soot particles produced by combustion in a non-direct injection diesel engine for passenger car. The use of full-cylinder sampling system so that the working fluid cylinder quickly discharged and diluted, and collected in the sampling bag, then the use of suspended particle electronic analyzer for analysis, measured in the expansion of the combustion chamber soot particle mass concentration and surface area concentration with Crankshaft angle changes course. The measured soot particle curve was simulated using a stochastic model developed at MIT. The kinetic equations of Lee and Beer were used to simulate the observed soot particle oxidation rate. The soot particle oxidation rate is very sensitive to the carbon particle diameter values set in the simulation model.