Combustion characteristics of gaseous diffusion flames emanating from a novel eco-friendly swirl-induced burner at a constant heating load: Energy approach

Ahmed Mahfouz M.M. Abd-Elgawad, Karim Emara and Ahmed Emara

Energy, 2025, vol. 324, issue C

Abstract: Combustion applications deal with exhaust emissions reduction without affecting combustion performance. This article displays comparative investigations of combustion characteristics experimentally and numerically (CFX) at constant heating load (10 kW) at different equivalence ratios. The combustion processes are maintained by an innovative designed swirl-induced LPG burner. The firing modes are (AFA) or without (AF-) according to annular air existence or not. The combustion measurements include thermal flame contours, exhaust gas emissions, stack losses, and combustor efficiency. A cylindrical water-cooled combustor is vertically mounted co-axial with burner centerline. The numerical modeling results show good agreement with the experimental measurements. Visual and thermal flame length is directly proportional to equivalence ratios at AF- and AFA operating conditions. The flow field modeling shows that AFA flames possessed dual recirculation zones that helps in mixing. AFA flames produce lower CO emissions at φ = 0.79, 0.86, and 0.96 than AF- flames; but thermal NOx emissions of AFA flames are higher due to a higher reaction rate. CO and N2 mass fractions emissions gave good agreement with experimental investigations.

Keywords: Swirl-induced burner; Exhaust and flame emissions; Flame contour; LPG; CFX; Stack losses (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:s0360544225016597

DOI: 10.1016/j.energy.2025.136017

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