NOx reduction in hydrogen-fueled direct-injected spark ignition (DISI) engine using post-injection strategy: Experimental and chemical kinetics approaches

Seunghyun Lee, Kiyeon Kim, Jeongwoo Lee, Yongrae Kim, Jaeyoung Cho, Sechul Oh and Kyoungdoug Min

Energy, 2025, vol. 324, issue C

Abstract: The increasing demand for sustainable transportation has emphasized the need for advanced technologies to mitigate greenhouse gas (GHG) and nitrogen oxide (NOx) emissions. Hydrogen internal combustion engines (HICEs) are promising candidates for zero-emission vehicles thanks to no CO2 emissions. However, managing NOx emissions remains a critical challenge, particularly under near-stoichiometric conditions. This study investigates a post-H2 injection strategy during the expansion stroke of HICEs to reduce NOx emissions inspired by selective non-catalytic reduction (SNCR). Post-H2 injection was performed at 40–160° aTDC in 20° CA intervals, with an injection pressure of 30 bar. The post-injection rate was varied from 10 % to 40 % of the total hydrogen flow rate at 2000 rpm and from 20 % to 40 % at 4000 rpm.

Keywords: Hydrogen-fueled engine; SI engine; Multiple injection; Post injection; NOx reduction (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:324:y:2025:i:c:s036054422501727x

DOI: 10.1016/j.energy.2025.136085

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