The effect of embedded EGR pipe in diesel engine intake port on in-cylinder intake stratification

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-08-30 DOI:10.1177/09544070241272784

Guangyuan Bao, Chao He, Libing Xie, Yingxue Xiao, Jiaqiang Li

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Abstract

This study focuses on the design of an embedded Exhaust gas recirculation (EGR) pipe within the helical intake port of a diesel engine, adjusting the in-cylinder EGR stratification by changing the structural parameters of the EGR pipe, and examining its impact on engine combustion and emissions. The main focus is on the effect of EGR pipe angle B on in-cylinder EGR stratification. The degree of in-cylinder EGR gas stratification is used to evaluate the EGR stratification gradient and analyze the effects of different swirl ratios and EGR stratification on combustion. The study shows that introducing CO2 through the EGR pipe can form an ideal radial stratification of rich outer and lean inner layers in the combustion chamber, with a maximum stratification degree of up to 13.2%. Comparative analysis of different swirl ratios and EGR gas introduction reveals that increasing the swirl ratio can significantly reduce soot emissions. Additionally, introducing 10% CO2 through the embedded EGR pipe can significantly reduce NO x emissions.

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柴油发动机进气口嵌入式 EGR 管对缸内进气分层的影响

本研究的重点是设计柴油发动机螺旋进气口内的嵌入式废气再循环（EGR）管道，通过改变 EGR 管道的结构参数来调整缸内 EGR 分层，并研究其对发动机燃烧和排放的影响。研究的重点是 EGR 管道角度 B 对缸内 EGR 分层的影响。利用气缸内 EGR 气体分层程度来评估 EGR 分层梯度，并分析不同漩涡比和 EGR 分层对燃烧的影响。研究表明，通过 EGR 管道引入二氧化碳可在燃烧室内形成理想的外层富裕、内层贫乏的径向分层，最大分层度可达 13.2%。对不同涡流比和 EGR 气体引入量的对比分析表明，增加涡流比可显著减少烟尘排放。此外，通过嵌入式 EGR 管道引入 10% 的 CO2 可以显著减少氮氧化物的排放。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.