Comparative analysis of combustion and emission characteristics of diesel/alcohol dual-fuel in a pressure-difference controlled same needle injector system with synergistic EGR optimization

IF 9.4 1区工程技术 Q1 ENERGY & FUELS

Energy Pub Date : 2025-09-27 DOI:10.1016/j.energy.2025.138663

Zhi Tian , Xupeng Feng , Yang Wang , Xudong Zhen , Xiaoyan Li

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引用次数: 0

Abstract

This study employs experimental and simulation methods to investigate a same-needle diesel-alcohol dual-fuel injector system based on pressure difference (ΔP) control. Under a 70 % load operating condition, a comparative analysis is conducted on the combustion and emission characteristics of three dual-fuel modes (diesel-methanol/ethanol/N-butanol (DMDF, DEDF, and DNDF)) and diesel in combination with exhaust gas recirculation (EGR). The results indicated that as the alcohol substitution ratio decreased (increased ΔP), CA10 occurred earlier, the combustion duration was prolonged. Among the four modes evaluated, the DMDF mode demonstrated the highest brake thermal efficiency (BTE) and the most significant emission reduction capabilities. Specifically, compared to conventional diesel operation, the BTE was improved by up to 9.77 %. Additionally, emissions of NO_x and soot were significantly reduced by a maximum of 70.98 % and 99.7 %, respectively. These benefits are mainly due to methanol’s high oxygen content, rapid combustion rate, and substantial evaporative cooling effect, which together enhance combustion completeness and suppress pollutant formation. Moreover, the combination of DMDF and EGR effectively alleviated the NO_x-soot trade-off. The study demonstrates that DMDF with the dual-fuel injector and EGR offers a highly promising pathway toward achieving high-efficiency, ultra-low emission engines applicable to transportation sectors.

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基于协同EGR优化的压差控制同针式喷油器柴油/酒精双燃料燃烧与排放特性对比分析

采用实验和仿真相结合的方法，对基于压差（ΔP）控制的同针柴油-酒精双燃料喷射系统进行了研究。在负荷70%工况下，对比分析了三种双燃料模式（柴油-甲醇/乙醇/正丁醇（DMDF、DEDF、DNDF））和柴油联合废气再循环（EGR）的燃烧和排放特性。结果表明：随着醇取代比的降低（ΔP增大），CA10发生时间提前，燃烧时间延长；在四种评估模式中，DMDF模式表现出最高的制动热效率（BTE）和最显著的减排能力。具体而言，与传统柴油操作相比，BTE提高了9.77%。此外，氮氧化物和烟尘的排放量最大分别减少了70.98%和99.7%。这些好处主要是由于甲醇含氧量高，燃烧速度快，蒸发冷却效果好，共同增强了燃烧的完整性，抑制了污染物的形成。此外，DMDF和EGR的组合有效地缓解了NOx-soot的权衡。研究表明，配备双燃料喷油器和EGR的DMDF为实现适用于交通运输部门的高效、超低排放发动机提供了一条非常有前途的途径。

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来源期刊

Energy 工程技术-能源与燃料

CiteScore

15.30

自引率

14.40%

发文量

审稿时长

14.2 weeks

期刊介绍： Energy is a multidisciplinary, international journal that publishes research and analysis in the field of energy engineering. Our aim is to become a leading peer-reviewed platform and a trusted source of information for energy-related topics. The journal covers a range of areas including mechanical engineering, thermal sciences, and energy analysis. We are particularly interested in research on energy modelling, prediction, integrated energy systems, planning, and management. Additionally, we welcome papers on energy conservation, efficiency, biomass and bioenergy, renewable energy, electricity supply and demand, energy storage, buildings, and economic and policy issues. These topics should align with our broader multidisciplinary focus.