Research on the substitution rate and main injection timing and ultra-low emission mechanism under diesel-methanol dual-fuel injector controlled by pressure difference

Zhi Tian, Xupeng Feng, Yang Wang, Xudong Zhen and Enshen Lu

Energy, 2025, vol. 335, issue C

Abstract: This study was based on a pressure difference (ΔP) controlled same-needle diesel-methanol dual-fuel (DMDF) injector, which systematically revealed the mechanisms of methanol substitution rate (MSR), main injection timing (SOImain), and composition on engine combustion and emissions. The results indicated that at high MSR (ΔP = 6–9 MPa), CA50 was delayed and brake thermal efficiency (BTE) decreased. The moderate MSR (ΔP = 10–12 MPa) balanced the oxygen content of methanol and the ignition ability of diesel, leading to the forward movement of CA50, shortened combustion duration, and achieved the highest BTE. Soot emissions meet emission regulations (0.01 g/kW · h) when MSR ≥50 %. Optimization analysis of the SOImain showed that DMDF mode had a faster combustion rate and CA50 was closer to the top dead center (TDC), ultimately enhancing BTE by 3.76 % relative to D mode operation. Soot and NOx emissions were reduced by 99.8 % and 74.4 % respectively compared to D2. Research on composition showed that the high oxygen content, OH oxidation characteristics and uniform mixture of methanol effectively promoted soot oxidation, while the temperature suppression effect in-cylinder reduced NOx emissions. Research had shown that moderate MSR and SOImain can improve BTE and achieve ultra-low emissions, providing theoretical and engineering support for near zero emission engine technology.

Keywords: Diesel-methanol dual-fuel; Methanol substitution rate; Main injection timing; Ultra-low emission; Same-needle dual-fuel injector (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544225039489
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:335:y:2025:i:c:s0360544225039489

DOI: 10.1016/j.energy.2025.138306

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().