Abstract
Abstract Velocity measurements have been obtained in a turbulent bluff-body stabilized methane flame. The flow configuration consisted of a 5.4-mm diameter fuel jet separated from an outer, annular-air flow by a 50-mm diameter bluff-body. A two-color laser Doppler velocimetry system was used to measure the mean and fluctuating statistics of all three velocity components and their correlations. Results were obtained under combustion and noncombusting conditions to quantify the effects of combustion on the flow and turbulence properties. The noncombusting flow field can best be characterized as dominated by the reverse flow of the annular air stream and exhibits well-de fined fuel and annular air stagnation points along the centerline. The primary effects of combustion are observed in the centerline region where the fuel-jet penetration increases due to the lower density of the recirculation zone gases. This increased fuel-jet penetration results in a downstream shift in the fuel-jet stagnation point. In co...
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