Abstract
Biogas-air coaxial jet flames are actively controlled through manipulation of the vortical structures and the associated mixing with miniature actuators installed on the annular nozzle. CH4 is diluted by N2 or CO2 to mimic biogas, and the emission characteristics and the temperature fields for the controlled flames are examined under different dilution rates. At low dilution rate, it is found that CO emission is significantly reduced due to the homogeneous mixing by the large vortices, which leads to premixed-like combustion. On the other hand, at high dilution rate, stable combustion can be achieved through the stratified mixing by the small vortices.
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