Effect of Inlet Flow Parameters on Confined Turbulent Swirling Flow

The development of a primitive-variable finite difference computer code is discussed, with application to a turbulent swirling nonreacting flow in a typical combustor. Primary air enters through the main inlet, and a secondary annular inlet in the outer wall is permitted through which secondary air flows. Parameters of special interest include the secondary to primary velocity ratio, primary swirl and contraction angles, and secondary swirl and upstream angles. Combustor flowfield predictions are given to illustrate the effects of these parameters on the flowfield (velocities and turbulence levels), and the dramatic effects are illustrated via velocity profiles and streamline patterns.