OPTIMIZATION OF INLET SWIRL FOR FLOW SEPERATION STRAIGHT ANNULAR DIFFUSER

Abstract

A diffuser is a device for converting the kinetic energy of an incoming fluid into pressure. As the flow proceeds through the diffuser there is continuous retardation of the flow resulting in conversion of kinetic energy into pressure energy. Such a process is termed as diffusion. Diffuser forms an important part in flow machinery and structures. The present study involves the CFD analysis for the prediction of flow characteristics using various mathematical models. The straight core annular diffuser considered in the present case has casing diverging with an angle keeping constant as 20°. This diffuser is coded as A type diffuser. The characteristic quantities such as static pressure distribution at hub and casing walls, velocity profiles at various sections and flow patterns have been presented for studying.