Studies on Shock Tube Generated Compressible Vortex Rings: a Practical Guide

Flow field and acoustic characteristics of compressible vortex ring evolution and its interaction with wall have been investigated for Mach number varying from 1.3 to 1.85 using high speed smoke visualizations and microphone. Importance of vortex ring study, classifications, generation mechanism, parameters that characterize its evolution and time line of vortex rings research since its discovery are discussed in Chap. 1. Shock tube design and theory of shock tube flow with the history and applications of shock tube are discussed in Chap. 2 and appendix A. The spatial and angular variations of incident shock diffracted at the shock tube exit are also studied using hot wire anemometer. The effect of driver section length, its pressure, and various driver section gases on shock strength and uniform flow time is discussed using method of characteristics (MOC) technique. Evolution of primary and counter rotating vortex rings (CRVR) are studied in chap. 3 and 4. Vortex ring diameter increases rapidly and translational velocity decreases during the formation and evolution of CRVR. The shock and wall interaction of vortex ring are discussed in Chap. 5.