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NUMERICAL STUDY OF FLAME FLASHBACK CRITERIA AND FLAME PROPAGATION IN PREMIXED COMBUSTION

DOI: 10.1615/ICHMT.2008.CHT.1310
13 pages

Nasser Seraj Mehdizadeh
Aerospace Engineering Department, Amirkabir University of Technology, Center of Excellence in Computational Aerospace, Engineering, Tehran, Iran

S. A. Nichkoohi
Department of Aerospace Engineering - Amirkabir University of Technology Center of Excellence in Computational Aerospace Engineering -Tehran - Iran

Résumé

Premixed combustion is widely used for reducing pollutant emission in combustion chambers. However these systems may be sensitive to complex phenomena such as flashback. In the present study flame flashback and structure of premixed laminar flames are investigated theoretically. The mathematical model includes the axi-symmetric continuity, Navier Stocks, energy, and species conservation equations. Combustion is modelled as one-step overall reaction using experimental relation with Arrhenius finite rate model. Flashback is examined as a function of wall velocity gradient, tube radius, and fuel concentration in mixture. The analysis is performed in two stages: first, the value of flashback criteria is calculated and the unstable region of combustion is obtained; second, flame is allowed to propagate into the region of investigation to study the flame structure. Because of complexity of flame flashback, difficulties of performing the experiments confronting flashback phenomena, and fire hazard, the numerical simulation of this phenomenon is strongly recommended.

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