基于碳烟粒径分布预测的柴油燃烧机理构建与氧含量影响研究

doi:10.19562/j.chinasae.qcgc.2023.01.011

Abstract

Abstract:

In order to predict the particle size distribution of the diesel engine soot emission， 90% mole fraction n-heptane and 10% mole fraction toluene are chosen as diesel substitutes to construct gas phase dynamics mechanism and surface dynamics mechanism respectively， which are coupled to form the diesel substitute mechanism （HTS mechanism）. Combined with the method of moments numeical model， validation of the HTS mechanism is conducted. Then the effect of oxygen concentration on soot particle size distribution is studied by changing the volume fraction of intake oxygen. The results show that the simulation values calculated by the HTS mechanism are basically consistent with the experimental data in terms of ignition delay period， laminar flame speeds， key species and soot particle size distribution in laminar premixed flames， in-cylinder pressure， heat release rate and emissions of the diesel engine. According to the study on the impact of the oxygen concentration on soot particle size distribution by the HTS mechanism， with the increase of oxygen concentration， the average and peak values of soot particle number density decrease， while particle diameters corresponding to the peak particle number density increase. Moreover， the number density of small soot particles （0~50 nm） decreases as oxygen concentration increases.

Key words: diesel engine, HTS mechanism, soot particle size distribution, oxygen concentration

Shaohua Liu,Haochuan Dong,Lizhong Shen. Study on Construction of Diesel Combustion Mechanism Based on Soot Particle Size Distribution Prediction and the Impact of Oxygen Concentration[J].Automotive Engineering, 2023, 45(1): 93-103.

Figures/Tables 16

References 41

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燃料	十六烷值	低热值/（MJ?kg^-1）	H/C
柴油替代物	51.3	44.2	2.17
柴油	52.8	42.8	1.86

参数	指标
缸径/mm	82
行程/mm	90.4
排量/L	0.477
压缩比	16.7
连杆长/mm	145.54
喷油器型号	Bosch CRIN2
喷孔数	6
进气门晚关角/（°）CA ATDC	-132
排气门早开角/（°）CA ATDC	112

参数	指标
转速/（ r·min^-1）	1 900
指示平均压力/MPa	0.57
进气压力/MPa	0.13
进气温度/K	323
涡流比	1.5

模型类型	名称
湍流模型	RNG k-ε
喷雾破碎模型	KH-RT
油滴撞壁模型	Han
壁面油膜模型	O’Rourke-Amsden
蒸发模型	DMC
边界传热模型	Han-Reitz

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Study on Construction of Diesel Combustion Mechanism Based on Soot Particle Size Distribution Prediction and the Impact of Oxygen Concentration

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