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Title: Interaction of a weak shock wave with a discontinuous heavy-gas cylinder

The interaction between a cylindrical inhomogeneity and a weak planar shock wave is investigated experimentally and numerically, and special attention is given to the wave patterns and vortex dynamics in this scenario. A soap-film technique is realized to generate a well-controlled discontinuous cylinder (SF{sub 6} surrounded by air) with no supports or wires in the shock-tube experiment. The symmetric evolving interfaces and few disturbance waves are observed in a high-speed schlieren photography. Numerical simulations are also carried out for a detailed analysis. The refracted shock wave inside the cylinder is perturbed by the diffracted shock waves and divided into three branches. When these shock branches collide, the shock focusing occurs. A nonlinear model is then proposed to elucidate effects of the wave patterns on the evolution of the cylinder. A distinct vortex pair is gradually developing during the shock-cylinder interaction. The numerical results show that a low pressure region appears at the vortex core. Subsequently, the ambient fluid is entrained into the vortices which are expanding at the same time. Based on the relation between the vortex motion and the circulation, several theoretical models of circulation in the literature are then checked by the experimental and numerical results. Most ofmore » these theoretical circulation models provide a reasonably good prediction of the vortex motion in the present configuration.« less
Authors:
; ;  [1] ;  [2]
  1. High Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000 (China)
  2. Advanced Propulsion Laboratory, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026 (China)
Publication Date:
OSTI Identifier:
22403236
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Fluids (1994); Journal Volume: 27; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 42 ENGINEERING; AIR; CYLINDRICAL CONFIGURATION; DISTURBANCES; GAS CYLINDERS; INTERACTIONS; INTERFACES; NONLINEAR PROBLEMS; PHOTOGRAPHY; PRESSURE RANGE PA; SHOCK TUBES; SHOCK WAVES; SOAPS; SULFUR FLUORIDES; SYMMETRY; THIN FILMS; VORTICES