Analysis of swirl decay rate in turbulent swirling flows in annular pipes

Researchers : Hyunjae Kim, Jaehoon Choi, Youngkeon Gong, Hyungrok Do (SNU)

Motivation & Objectives

        - Swirling flows inside the annular pipes are widely used in many engineering applications.

        - The prediction of the swirl number at the burner inlet is important to analyze the flow in the swirl-stabilized burner.

        - To find and analyze physical factors that affect the swirl decay rate in annular pipes.

Flow field

                - Contours of axial & azimuthal velocity with LES simulation

                - Contour map of the swirl decay rate.

                - The proposed model shows that there is an optimum γ that minizes the swirl loss in the annular pipe flows.