Interaction of a shock wave with a high-speed vortex ring

Abstract

This is a detailed experimental study of the behavior of diffraction and refraction of a shock front resulting from the interaction of a shock wave and a vortex ring. A spherical shock wave impinges on a vortex ring which is traveling at a high speed in the opposite direction. The configuration of the wave front is visualized by a shadowgraph technique using a pulse dye laser. The shock front is influenced by the non-uniform flow induced by the vortex and diffracted around the vortex core. The shock front passing through the inside of the ring is decelerated by the counter-flow, and the density behind it increases. The diffracted front over the vortex ring expands spirally around the core and intersects the front passing through the inside of the ring. The intersecting circular curve converges toward the central axis of the ring. The diffracted shock in the inner part of the core forms branching waves. The branching points also focus on the central axis of the ring.

Three-dimensional shock wave distortion in shock-square vortex loop interaction

“…As shown in previous studies [19,28], the shock wave interaction process is divided into two sections: the outer and the central parts of the vortex ring. In shock wave interactions with square vortex loops, the behaviour generating the retarded/diffracted shock waves at the outer and central parts of the vortex loop resembles that of interaction with a circular vortex loop.…”

“…Since the early 1990s, there have been experimental, numerical, and theoretical investigations of shock wave interaction with vortex rings [20-22, 26, 27]. Minota [28] experimentally investigated shock-vortex ring interactions when the shock wave impinges head-on. She showed that the diffracted shock wave which interacts with the vortex ring propagates towards the centre of the vortex ring, which results in the shock wave focusing at the centre of the vortex ring.…”

Vorticity in Flow Fields (in Relation to Prandtl s Work and Subsequent Developments)

“…Animals are wise enoug to take advantage of the reaction forces variously. A vortex ring generated by a shock impulse [7]. Figure 3.…”

Shock wave-induced vortex loops emanating from nozzles with singular corners

“…5 No matter the initial conditions in which a vortex loop is generated, there are three stages in the propagation of a vortex loop: formation, development, and decay. Although numerous authors have reported both experimental and numerical studies on vortex loop characteristics covering the incompressible, 6-12 compressible, 13,14 and detonation regimes, 15 there is a scarcity of data on compressible vortex loops and jets generated from nozzles with singular corners. Compressibility alone has a great influence in the propagation of vortex loops.…”