マイクロ・アクチュエータ群によるモデル燃焼器内予混合火炎の能動制御(熱工学,内燃機関,動力など)  [in Japanese] Active Control of Premixed Flame in a Model Combustor with Arrayed Micro Actuators(Thermal Engineering)  [in Japanese]

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 nozzle. CH radical luminescence, CO and NO_x 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 drastlcally improved without an increase of NO_x 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.