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Large-eddy simulation of tri-fuel combustion: Diesel spray assisted ignition of methanol-hydrogen blends
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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17
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International Journal of Hydrogen Energy, Volume 46, issue 41, pp. 21687-21703
Abstract
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.
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Gadalla, M, Kannan, J, Tekgul, B, Karimkashi, S, Kaario, O & Vuorinen, V 2021, 'Large-eddy simulation of tri-fuel combustion : Diesel spray assisted ignition of methanol-hydrogen blends', International Journal of Hydrogen Energy, vol. 46, no. 41, pp. 21687-21703. https://doi.org/10.1016/j.ijhydene.2021.03.238