Abstract
The simulant biogas-air coaxial jet flow and combustion are actively controlled through periodic excitation of the initial jet shear layer with arrayed miniature jet actuators. In the present study, CH_4 fuel is diluted by N_2 or CO_2 with various dilution rates to mimic biogas. Firstly, it is found that the large-scale vortical structures and the associated mixing of biogas-air are flexibly controlled by changing the injection frequency of miniature jet. In addition, it is demonstrated that CO emissions from the biogas flames operated with different fuel dilution rates can be significantly improved by manipulating the mixing upstream of the flame base.
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