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| Effect of EGR on soot precursor formation in combustion of biodiesel/diesel with different blending ratios |
| 1. School of Automotive and Traffic Engineering， Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Automotive and Traffic Engineering, Nantong Vocational University, Nantong, Jiangsu 226007, China |
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Abstract Taking biodiesel/diesel as research object, by AVL-Fire software and Chemkin software, the biodiesel/diesel chemical reaction kinetics model was constructed to investigate the effects of blending ratio and EGR rate of biodiesel/diesel on the soot precursor formation of acetylene, benzene, naphthalene, phenanthrene and pyrene. The results show that the soot precursor is mainly formed in the premixed combustion stage. With the increasing of crank angle, the soot precursor content is increased with latter decreasing. With the increasing of biodiesel blending ratio, the initial formation time of soot precursor is advanced, and the peak amount of production and the final amount of production are reduced. With the increasing of EGR rate, the peak formation timing is delayed, and the production peak of acetylene is reduced with gradually increased final amount. The final amount of benzene, naphthalene, phenanthrene and pyrene is increased.
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Received: 20 June 2019
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2020, Vol. 41 
