Flow Characteristics and Control of Turbulent Annular Jet : Effets of a Coaxial Round Jet

Abstract

This paper presents the detailed experimental and numerical analyses for the flow characteristics of an annular air jet and its control using a coaxial round jet. As a result, the mean and fluctuating flow characteristics of an annular jet, such as the velocity profiles, decay of maximum velocity, spread of jet, flow rate, pressure distribution, turbulence intensity and turbulence kinetic energy, and the effects of a coaxial round jet on them were clarified, and it was found the flow characteristics of the annular jet can be controlled by changing the velocity ratio of the coaxial round jet to an annular one. Numerical analysis was carried out using the k-ε turbulent model.