Flowfield results are presented on the effect of combustor confinement and radial distribution of swirl in a burner under non burning conditions to simulate the flow behavior of one swirl cup in gas turbine combustor configuration under lean direct injection (LDI) conditions. 3-D PIV data has been obtained to obtain flowfield information using for varying swirl distributions in the burner. Flow characteristics of the resulting flowfield, both without and with combustion, have been examined for the effect of co- and counter-swirl under lean direct injection conditions using unconfined and confined combustor geometry. Combustion alters the swirl number of the flow. Results showed that both swirl and combustion has significant effect on the characteristics of the internal and external recirculation zones. The effect of confinement on the flowfield distribution was determined under non-burning conditions. Combustion enhances the recirculation zone in the unconfined geometry. Combustion provides greater velocity magnitudes than their counter non-combustion conditions. The counter-swirl combination resulted in smaller and more well-defined internal recirculation regions. The results provide the role of swirl and combustion on the mean and turbulence characteristics of flows over a range of swirl and shear conditions between the inner and outer annulus of the burner. The data provides important insights on the flow dynamics in addition to providing a database for model validation and model development.
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