Abstract
The lean premixed flame stabilized by a bluff-body downstream of a coaxial nozzle is actively controlled by using micro magnetic flap actuators attached to the outer jet noz+zle. CH radical luminescence, CO and NOx, emissions are measured to assess the controlled flame, while PLIF is employed to elucidate the control mechanism. At both of full and partial load conditions, which are represented by the equivalent ratio of φ = 0.72 and 0.48, respectively, the flame stability and also the CO emission are drastically improved without an increase of NOx emission. At φ = 0.72, stable lean premixed combustion is achieved through the fuel / air mixing enhanced by the large-scale vortices, which are formed when the flaps are driven at the Strouhal number of unity. On the other hand, at φ = 0.48, the premixed combustion, which is otherwise hard to achieve, is stabilized by the stratified mixing due to the induced small-scale vortices produced at the Strouhal number much larger than unity.
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