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Title: | Numerical analysis of zero-carbon HCCI engine fuelled with steam diluted H<inf>2</inf>/H<inf>2</inf>O<inf>2</inf> blends |
Authors: | Fernie, O Megaritis, T Ganippa, LC Tingas, E-A |
Keywords: | hydrogen;HCCI;ignition promoter;hydrogen peroxide;heavy duty engine;NOx |
Issue Date: | 1-Jul-2022 |
Publisher: | Elsevier |
Citation: | Fernie, O., Megaritis, T., Ganippa , L.C. and Tingas, E.-A. (2022) 'Numerical analysis of zero-carbon HCCI engine fuelled with steam diluted H<inf>2</inf>/H<inf>2</inf>O<inf>2</inf> blends', Fuel, 326, 125100, pp. 1 - 15. doi: 10.1016/j.fuel.2022.125100. |
Abstract: | Copyright © 2022 The Author(s). The addition of hydrogen peroxide and steam to a hydrogen-fuelled HCCI engine was investigated at various fuel lean conditions (ϕeff = 0.2–0.6) and compression ratios (15–20) using a 0-dimensional numerical model. The use of hydrogen peroxide as an ignition promoter demonstrated increased IMEP (16%–39%), thermal efficiency (up to 2%), and reduced NOx (50%–76%) when compared to the conventional method of intake charge heating. When hydrogen peroxide was used as an ignition promoter, a 15% addition of steam was sufficient to reduce NOx by 93%–97%, though this reduced IMEP and thermal efficiency slightly. When heat transfer was considered and steam addition was increased from 0%–10%, no increase in intake air heating was able to match the IMEP of 5% hydrogen peroxide addition without an increase in the equivalence ratio (up to 40%). The parametric space of hydrogen peroxide (0%–25%) and steam (0%–40%) addition was explored in view of engine performance metrics, showing the complete range of conditions possible through control of both inputs. A three-order reduction in NOx was possible through steam addition. An optimal balance of performance and emissions occurred at 5%–10% hydrogen peroxide and 10%–15% steam addition. In a study of compression ratio, very little hydrogen peroxide addition (<5%) was required to achieve 98% of the maximum efficiency at higher compression ratios (19–20), though at lower compression ratios (<17) impractical quantities of hydrogen peroxide were required. The 10% steam addition present at these conditions led to extremely low NOx levels for ϕeff of 0.3 and 0.4, though at ϕeff of 0.5 NOx levels would require some after-treatment. Maintaining constant a high or low load across steam additions was possible through reasonable adjustment of hydrogen peroxide addition. |
URI: | https://bura.brunel.ac.uk/handle/2438/24967 |
DOI: | https://doi.org/10.1016/j.fuel.2022.125100 |
ISSN: | 0016-2361 |
Other Identifiers: | 125100 |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
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