Primitive Pressure-Velocity Code for the Computation of Strongly Swirling Flows

As an aid to economical design and operation of combustion systems, a primitive pressure-velocity finite difference code has been developed to predict strongly swirling inert and reacting turbulent flow.The method and program involve a staggered grid system for axial and radial velocities, a line relaxation technique for efficient solution of the equations, and a two-equation A-e turbulence model, together with a simple one-step chemical reaction model based on eddy-breakup concepts. Computations show the interesting effects of swirl on jet growth, entrapment, and decay, and flame size, shape, and combustion intensity, as well as the occurrence of a central toroidal recirculation zone at high degrees of swirl.