长短链酯与柴油混合燃料的氧化反应活性研究

梅德清; 章传方; 于奇松; 祁佳伟; 俞玥

doi:10.3969/j.issn.1001-2222.2022.03.003

车用发动机 ›› 2022, Vol. 0 ›› Issue (3) : 15-22. DOI: 10.3969/j.issn.1001-2222.2022.03.003

栏目

长短链酯与柴油混合燃料的氧化反应活性研究

梅德清¹，章传方¹，于奇松²，祁佳伟¹，俞玥¹

作者信息 +

Chemical Reaction Kinetics of Diesel Fuel Blended with Esters of Long/Short Carbon Chain

MEI Deqing¹,ZHANG Chuanfang¹,YU Qisong²,QI Jiawei¹,YU Yue¹

Author information +

文章历史 +

摘要

为了研究交叉反应对碳酸二甲酯（DMC）柴油和生物柴油柴油混合燃料的低温和高温氧化作用的影响，利用定容均质反应器分别计算了DMC柴油和生物柴油柴油混合燃料重要组分浓度和反应路径变化差异。采用Converge软件自带正庚烷机理来替代柴油，该机理包含42种组分和168个基元反应。利用定容均质反应器分别计算D10，D50燃料（在柴油中掺混10%,50%质量分数DMC）和B10，B50燃料（在柴油中掺混10%,50%质量分数生物柴油）中重要组分浓度及反应路径的变化，分别分析了在初始温度为900 K、初始压力为4.3 MPa、当量比为1与在初始温度为1 350 K、初始压力为6 MPa、当量比为1两种不同工况下D10，D50，B10，B50混合燃料燃烧反应体系中关于OH的交叉反应流情况。分析结果表明：在两种工况下D10燃料体系中OH生成量增多，促进反应进行；D50燃料体系中，OH生成量减小，削弱反应进行；B50燃料体系活性均大于B10。结合低温和高温下DMC柴油和生物柴油柴油混合燃料交叉反应流可以发现，CH₂O＝HCO＝CO这条反应路径在混合燃料交叉反应中占有重要地位。

Abstract

To compare and investigate the effect of cross-reaction on the low and high temperature oxidation of DMC-diesel and biodiesel-diesel blends, the variations of important component concentrations and reaction pathways were separately calculated by using a constantvolume homogeneous reactor. The n-heptane mechanism in Converge software was employed to substitute diesel, which contained 42 components and 168 element reactions. The changes of important component concentrations and reaction pathways in D10 (mixed with 10% mass fraction DMC in diesel), D50 (mixed with 50% mass fraction DMC in diesel), B10 (mixed with 10% mass fraction biodiesel in diesel) and B50 (mixed with 50% mass fraction biodiesel in diesel) were investigated using a constantvolume homogeneous reactor, and the cross-reaction flows of OH in their combustion reaction systems were analyzed separately at 900 K, 4.3 MPa and 1 350 K, 6 MPa with the same equivalence ratio of 1. The analysis results showed that the OH production of D10 increased and promoted the reaction, the OH production of D50 decreased and weakened the reaction, and the activity of B50 was greater than that of B10 in both conditions. The reaction pathway of CH₂O＝HCO＝CO played an important role in the crossreaction of blended fuels according to the results of crossreaction flow.

导出引用

梅德清，章传方，于奇松，祁佳伟，俞玥. 长短链酯与柴油混合燃料的氧化反应活性研究[J]. 车用发动机. 2022, 0(3): 15-22 https://doi.org/10.3969/j.issn.1001-2222.2022.03.003

MEI Deqing,ZHANG Chuanfang,YU Qisong,QI Jiawei,YU Yue. Chemical Reaction Kinetics of Diesel Fuel Blended with Esters of Long/Short Carbon Chain[J]. Vehicle Engine. 2022, 0(3): 15-22 https://doi.org/10.3969/j.issn.1001-2222.2022.03.003