Abstract
Abstract Laminar counterflow combustion configurations have been studied extensively in the investigation of fundamental combustion phenomena, such as fuel dilution, strain rate, and pressure dependence on flame extinction limits. However very few studies have been performed on turbulent counterflow diffusion flames. The turbulent opposed flow configuration chosen here consists of a fuel jet pipe of d = 6.4 mm in diameter directed downward toward an air jet 50 mm in diameter, shielded wilh a concentric air jet of 13 mm diameter. The vertical distance between the fuel jet exit and the air flow can be adjusted to investigate the influence of the overall strain rate along the centerline of this configuration. A hydrogen-helium mixture was chosen to investigate the effects of dilution on the structure of the diffusion flame. To investigate the combustion effects on the turbulent mixing, reacting and non reacting conditions were studied at the same Reynolds number. In order to study the reaction zone structure...
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