A131 非定常火炎噴流による定容燃焼容器内予混合ガスの着火・燃焼過程の可視化観察

Abstract

Ignition and combustion processes in a prechamber combustor by a flame jet are experimentally investigated using schlieren photography. The effects of the nozzle diameter on the structure of flame jet, ignition process, and subsequent combustion process in the main chamber are examined by combining schlieren observations and main chamber pressure histories. The structure of flame jet is found to be greatly influenced by the nozzle diameter, and can be classified into four types; a high speed jet of hot combustion products without flame kernels, one including a small amount of flame kernels and rich active species, a relatively high speed jet containing with flame kernels, and a low speed flame column. Depending on these flame jet properties, the ignition and combustion processes in the main chamber are also divided into four types; extinction of a flame jet, extremely rapid explosion after a long ignition delay time, relatively rapid turbulent combustion with fine wrinkles, and spherically propagating slow wrinkled laminar combustion.