Article
Version 2
Preserved in Portico This version is not peer-reviewed
Behaviour of Premixed Sooting-Flame in A High-Pressure Burner
Version 1
: Received: 25 January 2023 / Approved: 30 January 2023 / Online: 30 January 2023 (09:16:43 CET)
Version 2 : Received: 31 January 2023 / Approved: 1 February 2023 / Online: 1 February 2023 (06:46:18 CET)
Version 2 : Received: 31 January 2023 / Approved: 1 February 2023 / Online: 1 February 2023 (06:46:18 CET)
A peer-reviewed article of this Preprint also exists.
Saylam, A. Behavior of Premixed Sooting Flame in a High-Pressure Burner. Reactions 2023, 4, 155-170. Saylam, A. Behavior of Premixed Sooting Flame in a High-Pressure Burner. Reactions 2023, 4, 155-170.
Abstract
The second-order factor effect of burner optical ports and edge inter-matrices (EIM) and the first-order factor of pressure on the soot formation process and behavior of premixed sooting flames in a high-pressure burner are numerically investigated here. Three-dimensional computational fluid dynamics (CFD) simulations of a premixed flame C2H4/air at p = 1.01 and 10 bar using a one-step chemistry approach are first performed to justify the satisfied predictability of the prospective axisymmetric two-dimensional (2D) and one-dimensional (1D) simulations. The justified 2D simulation approach shows the generation of an axial vorticity around the EIM and axial multi-vorticities due to the high expansion rate of burnt gases at the high pressure of 10 bar. This leads to the development of axial multi-sooting zones, which are manifested experimentally by visible luminous soot streaks, and to the boosting of soot formation conditions of a relatively low-temperature field, < 1800 K, and a high mixing rate of gases in combustion around and above the EIM location. Nevertheless, a tolerable effect on the centerline soot volume fraction (fV) profile, fV < 3%, is manifested only at high heights above the burner of the atmospheric sooting flame C2H4/air ϕ = 2.1, and early at the high pressure of 10 bar of this flame, fV < 10%. Enhancing the combustion process reactivity by decreasing the rich equivalence ratio of the fuel/air mixture and/or rising the pressure results in the prior formation of soot precursors, which shifts the sooting zone upstream.
Keywords
CFD simulation; flat flame; high-pressure burner; soot formation; premixed flame
Subject
Engineering, Energy and Fuel Technology
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Commenter: Ahmad Saylam
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