FLAME BEHAVIOR OF BIFURCATED JETS IN A V-SHAPED BLUFF-BODY BURNER

摘要

A plane fuel jet bifurcated into two streams of jets by a V-shaped bluff-body burner with co-flowing air streams was studied. The flame behavior, length, and temperature distributions of the bifurcated jets were experimentally examined. Flame behavior was characterized by flame visualization and instantaneous photograph. The flame length characteristics was obtained by using the long-exposure flame images. The temperatures distributions were measured by using a fine-wire thermocouple. Three characteristic flame modes were revealed-attached flame, transitional flame, and lifted flame. The flame length and width of the bifurcated jets increase with the increase of the Re_c in fixed Re_a. The length of the bifurcated flame was significantly shorter than that of the plane jet flame. The reduction was induced by the enhancement in the mixing and entrainment effects of the bifurcated flame. The maximum temperature of the bifurcated-jets flame decreases with the increase of the Re_c. The bifurcated jets enhanced the mixing of the fuel and the air and improved the combustion efficiency. The flame behavior and combustion characteristics of the bifurcated jets changed drastically due to the effects of entrainment and recirculation.