A combined experimental and numerical study has been conducted to investigate the impinging flame structure. Inflame temperature profiles were obtained and compared with corresponding simulated profiles. For detailed understanding of flame structure numerical simulations were carried out using commercial CFD code FLUENT. Simulated temperature, heat flux and species profiles were analyzed. Further investigations were done by plotting streamlines, velocity magnitude profiles and species profiles. It has been seen that bulk of the combustion products were burnt rapidly in the narrow reaction zone at the tip of the flame. This was because of exponential relationship between the chemical reaction rate and temperature. Simulation results show high temperature in the region between the inner premixed and the outer non-premixed (diffusion) reaction zones. The burnt gas along the inner zone expands and molecules change their directions from initially parallel to diverging lines. Flow accelerated from stagnation point and attained maximum velocity at the start of wall-jet region.

Volume Subject Area:
Combustion, Fire and Reacting Flow
Topics:
Flames, Methane, Temperature, Chemical kinetics, Combustion, Computational fluid dynamics, Computer simulation, Diffusion (Physics), Flow (Dynamics), Heat flux, High temperature, Simulation results, Temperature profiles
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Copyright © 2009
 by ASME
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