Flame structure of LPG-air Inverse Diffusion Flame in a backstep burner

• Published in: Fuel (Guildford) Vol. 89; no. 8; pp. 2145 - 2148
• Main Authors: Mahesh, S., Mishra, D.P.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-08-2010; Elsevier
• Subjects: Applied sciences; Back step burner; Correlation; Diffusion flames; Dual flame structure; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Flame structure; Fluid dynamics; Fuels; Global Momentum Ratio; Inverse; LPG Inverse Diffusion Flame; Signatures; Turbulence; Global Momentum Ratio; Dual flame structure; LPG Inverse Diffusion Flame; Back step burner; Turbulent flame; Temperature distribution; LPG; Flame temperature; Chemiluminescence; Jet fuel; Experimental study; Concentration measurement; Temperature measurement; Diffusion flame; Flame structure; Burner; Air jet; Concentration distribution
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2010.01.030

The present experimental study characterizes the turbulent LPG Inverse Diffusion Flame (IDF) stabilized in a backstep burner in terms of visible flame length, dual flame structure, centerline temperature distribution, and oxygen concentration. The visible flame length for a fixed fuel jet velocity is found to reduce with increase in air jet velocity. Besides this, the effect of air and fuel jet velocities on visible flame length is interpreted using a new parameter, Global Momentum Ratio (GMR). Interestingly, GMR seems to be correlating well with the visible flame length for the air and fuel velocity ranges considered in the present study. Moreover, the dual flame structure of IDF is identified with the help of CH-chemiluminescence signature. The existence of dual flame structure of IDF is confirmed further with the centerline temperature and oxygen concentration measurements.