Abstract
In this paper, the effects of co-flow air on partially premixed biogas flame have been investigated. Primary air is supplied along with biogas and secondary air is supplied through the annular region of the burner. The effects of primary air and secondary air on biogas flame structure, and the flame speed has been investigated. A digital image of the biogas flame is analysed to study the flame shape, size, height, radius and chemiluminescence from the flame. For biogas, the requirement of stoichiometric air is very less in comparison to other hydrocarbon due to the composition of biogas. When the primary airflow rate is increased up to 12.5% of gas flow rate, the partially premixed flame is visible. After that, it decreases due to the increased availability of oxidizer in the primary mixture of biogas and air. After a certain limit of primary air, the flame is lifted at a certain height and then blow off region is formed. To observe the flame speed of biogas is decrease, when an increase in secondary air flow rate. An increase in the flame speed is observed with an increase in primary air but the flame speed decreases with an increase in the percentage of secondary air.
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