Numerical evaluation of ignition timing influences on performance of a stratified-charge H2/methanol dual-injection automobile engine under lean-burn condition

Changming Gong, Dong Li, Jiajun Liu and Fenghua Liu

Energy, 2024, vol. 290, issue C

Abstract: Influences of ignition timing (IT) on combustion, carbon monoxide (CO) and nitric oxide (NO) regulated emissions and formaldehyde (HCHO) and unburned methanol (CH3OH) unregulated emissions in a hydrogen (H2)/methanol dual-injection automobile engine under lean-burn condition were studied numerically. The results demonstrate that at lean-burn (excess air ratio = 2.0) condition, the peak cylinder pressure (PCP), peak heat release rate (PHRR) and peak cylinder temperature (PCT) all decrease with delayed IT, and their corresponding crank angles are also late; ignition delay (ID) and combustion duration (CD) decrease with delayed IT; CO, HCHO and CH3OH emissions increase with delayed IT, while NO emission decreases with delayed IT. At a fixed IT, PCP, PHRR and PCT for with adding 5 % H2 (RH2 = 5 %) are higher than those for without adding H2 (RH2 = 0 %), and their corresponding crank angles for RH2 = 5 % are earlier than those for RH2 = 0 %; ID and CD for RH2 = 5 % are lower than those for RH2 = 0 %. CO, HCHO and unburned CH3OH emissions for RH2 = 5 % are also much lower than those for RH2 = 0 %, while NO emission for RH2 = 5 % is also higher than that for RH2 = 0 %. The influence order of adding H2 to reduce emissions of engine is: CO > HCHO > unburned CH3OH.

Keywords: Automobile engine; H2/methanol dual-injection; Ignition timing; Stratified-charge; Performance; Lean-burn (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:290:y:2024:i:c:s0360544223036034

DOI: 10.1016/j.energy.2023.130209

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