自励振動燃焼の特性と混合気の強制脈動供給を利用した燃焼制御

抄録

Characteristics of self-excited combustion oscillation are experimentally studied using confined premixed flames stabilized by a rearward-facing step. A new idea to suppress combustion oscillation was applied to the flames. We examined the characteristics of unsteady combustion driven by forced pulsating mixture supply that can be modulated its amplitude and frequency. The self-excited combustion oscillation having flow velocity fluctuation intensity weaker than that of the forced pulsating supply can be suppressed by the method. The effects of the forced pulsation amplitude and frequency on controlling self-excited combustion oscillations were also investigated comparing with the steady mixture supply. The unsteady combustion used in this experiment plays an important role in controlling self-excited combustion oscillations, and it also exhibits desirable performances, from a practical point of view, such as high combustion load and reduced pollutant emissions of nitric oxide.