Control of Combustion in a Closed Chamber by a Hydrogen Flame Jet Ignition : Heat Flux in a Cavity

Jet ignition method by hydrogen oxygen flame is proposed to control the combustion of lean mixtures. Hydrogen flame jet is supplied from the cavity whose volume is less than one percent of main chamber volume through a nozzle. Generally, the heat loss of the jet ignition method at the chamber wall is thought to be bigger than conventional ignition. In this report, the heat flux at the cavity wall are measured. The heat flux in the cavity is larger than that in the main chamber. The leaner the mixture in the main chamber is, the smaller the heat flux is. When hydrogen oxygen mixture is used in the cavity, the heat flux is much bigger than that using hydrogen air mixture. The smaller the nozzle diameter is, the bigger the heat flux becomes. The heat flux depends on the velocity of the flame in the cavity.