Hydrogen-ammonia-air flame acceleration and explosion overpressure generation in a horizontal closed obstructed duct

Bo Liang, Kai Zhang, Wei Gao, Yuting Jiang and Yanchao Li

Renewable Energy, 2025, vol. 240, issue C

Abstract: Applying renewable hydrogen-ammonia mixed energy, composed of green hydrogen and green ammonia, in internal combustion engine can help reduce carbon emissions from the transportation sector. It is essential to understand the fundamental combustion characteristics to support its development. Therefore, the effects of equivalence ratio, ammonia ratio, and obstacle number on hydrogen-ammonia-air flame dynamics in an obstructed duct are obtained in this work. A prediction model is established to reveal the flame acceleration and overpressure generation. The results indicated that as the obstacle number increases, the flame structure within the main flame vortex transitions from wrinkled to filamentous fragmented flame structure; the flame tip speed increases, with the maximum value occurring at the cumulative acceleration stage. As the ammonia ratio increases, both the maximum flame tip speed and the speed fluctuation amplitude decreases. Regarding the explosion overpressure, the maximum explosion overpressure increases slightly with the increasing obstacle number. When the ammonia ratio is below Ω = 20 %, the obstacle #3 significantly increases the amplitude of explosion overpressure fluctuation. The prediction model can accurately predict the pressure rise rate under different experimental conditions and suggest that the flame stretching acceleration and the turbulent acceleration are the primary factors affecting the pressure rise rate.

Keywords: Carbon-free fuel; Ammonia addition; Turbulent flame acceleration; Explosion overpressure prediction (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148124022948
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:240:y:2025:i:c:s0960148124022948

DOI: 10.1016/j.renene.2024.122226

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().