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Development of marine engines could largely benefit from the broader usage of methanol and hydrogen which are both potential energy carriers. Here, numerical results are presented on tri-fuel (TF) ignition using large-eddy simulation (LES) and finite-rate chemistry. Zero-dimensional (0D) and three-dimensional (3D) simulations for n-dodecane spray ignition of methanol/hydrogen blends are performed. 0D results reveal the beneficial role of hydrogen addition in facilitating methanol ignition. Based on LES, the following findings are reported: 1) Hydrogen promotes TF ignition, significantly for molar blending ratios β X = [H 2]/([H 2]+[CH 3OH]) ≥0.8. 2) For β X = 0, unfavorable heat generation in ambient methanol is noted. We provide evidence that excessive hydrogen enrichment (β X ≥ 0.94) potentially avoids this behavior, consistent with 0D results. 3) Ignition delay time is advanced by 23–26% with shorter spray vapor penetrations (10–15%) through hydrogen mass blending ratios 0.25/0.5/1.0. 4) Last, adding hydrogen increases shares of lower and higher temperature chemistry modes to total heat release.
|Number of pages||17|
|Journal||International Journal of Hydrogen Energy|
|Early online date||24 May 2021|
|Publication status||Published - 15 Jun 2021|
|MoE publication type||A1 Journal article-refereed|
- Large-eddy simulation
- EMISSION CHARACTERISTICS
- RCCI COMBUSTION
- INJECTION PRESSURE
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- 2 Finished
DIAG/Karimkashi: Multi-fuel combustion: development of a diagnostic tool for carbon-neutral combustion
01/09/2020 → 31/08/2023
Project: Academy of Finland: Other research funding