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Influence of dissociated methanol gas direct injection pressure on the performance of methanol port injection engine

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  • Xiangyang, Wang
  • Huili, Dou
  • Liang, Zhang
  • Tong, Wu
  • Shuzhe, Ma
  • Xiaoping, Li
  • Fangxi, Xie

Abstract

Methanol is recognized as the most promising carbon-neutral fuel currently available. Online methanol dissociation for hydrogen production is an effective strategy to improve the efficiency of methanol engines. This paper investigates the impact of DMG injection parameters on methanol engine performance to explore the best combination of DMG injection parameters. Increasing the DMG injection pressure and optimizing the DMG injection timing can advance CA50, as well as shorten CA10-IG and CA90-CA10. Meanwhile, CO and HC emissions and BSFC decline, while NOx emissions rise. Analysis reveals that the optimal combination of DMG injection parameters is 8 MPa and 260 °CA BTDC. As speed and BMEP of engine rise, the influence of DMG injection pressure on combustion parameters progressively lessens. When DMG injection pressures are 2, 4, and 6 MPa compared to 8 MPa, BSFC increases by 0.9%–1.8 %, 0.3%–0.7 %, and 0.1%–0.2 % under various operating conditions (case 1-case 6), respectively.

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  • Xiangyang, Wang & Huili, Dou & Liang, Zhang & Tong, Wu & Shuzhe, Ma & Xiaoping, Li & Fangxi, Xie, 2025. "Influence of dissociated methanol gas direct injection pressure on the performance of methanol port injection engine," Energy, Elsevier, vol. 320(C).
    • Handle: RePEc:eee:energy:v:320:y:2025:i:c:s0360544225010242
    DOI: 10.1016/j.energy.2025.135382
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