Combustion and emission characteristics of diesel engines fueled with diethoxymethane blends under varying load conditions

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-10-08 DOI:10.1016/j.tsep.2025.104189

Shanshan Ruan , Wenyao Zhao , Junheng Liu , Chengcheng Ao

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Abstract

This study systematically evaluates the combustion, emission, and fuel economy characteristics of pure diesel and a diethoxymethane (DEM) blend (DEMDB, 1:4 vol ratio with diesel) in a diesel engine under varying load conditions. Experimental results demonstrate that both fuels exhibit increased peak in-cylinder pressure and a transition from single-peak to dual-peak heat release rate patterns with rising loads. DEMDB, characterized by low latent heat of vaporization and a distinct molecular structure, displays unique combustion behavior, with prolonged ignition delay and combustion duration at low loads but aligning closely with diesel at high loads. A key finding is that DEMDB significantly reduces soot emissions by 46.5 %–62.1 % across all loads compared to pure diesel, attributed to its oxygen-rich composition that suppresses polycyclic aromatic hydrocarbon formation. However, DEMDB increases NOx emissions by 3.4 %–8.1 % due to extended high-temperature combustion and oxygen-enhanced nitrogen oxidation. Brake thermal efficiency (BTE) of DEMDB is slightly lower than diesel at low loads but surpasses diesel at medium-to-high loads, reflecting enhanced combustion efficiency. These findings underscore DEM’s potential as a sustainable, biomass-derived diesel additive for achieving cleaner combustion, while highlighting the need for combustion phasing optimization and advanced aftertreatment to mitigate NOx emissions.

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以二氧基甲烷混合物为燃料的柴油机在不同负荷条件下的燃烧和排放特性

本研究系统地评估了在不同负载条件下，纯柴油和二氧基甲烷（DEM）混合物（DEMDB，与柴油的体积比为1:4）在柴油机中的燃烧、排放和燃油经济性特性。实验结果表明，随着负荷的增加，两种燃料的缸内压力峰值均增加，热释放速率模式由单峰向双峰转变。DEMDB具有汽化潜热低、分子结构独特的特点，在低负荷下具有较长的点火延迟和燃烧持续时间，而在高负荷下与柴油基本一致，具有独特的燃烧性能。一个关键的发现是，与纯柴油相比，DEMDB在所有负载下都能显著减少46.5% - 62.1%的烟尘排放，这归功于其富氧成分抑制了多环芳烃的形成。然而，由于延长的高温燃烧和氧增强的氮氧化，DEMDB增加了3.4% - 8.1%的氮氧化物排放量。DEMDB的制动热效率（BTE）在低负荷时略低于柴油，但在中高负荷时超过柴油，反映出燃烧效率的提高。这些发现强调了DEM作为一种可持续的生物质衍生柴油添加剂的潜力，可以实现更清洁的燃烧，同时强调了燃烧阶段优化和高级后处理以减少氮氧化物排放的必要性。

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

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.