NDLI: Experimental study on the interaction of planar shock wave with polygonal helium cylinders

Content Provider	SpringerLink
Author	Wang, M. Si, T. Luo, X.
Copyright Year	2014
Abstract	The evolution of a polygonal helium cylinder impacted by a planar weak shock wave is investigated experimentally. Three different polygonal interface shapes including a square, an equilateral triangle and a diamond are formed by the soap film technique, where thin pins are used as edges to connect the adjacent sides of soap films. Shock tube experiments are conducted to obtain sequences of schlieren images using a high-speed video camera. In each case, the development of the wave system and the evolution of the polygonal helium cylinder subjected to a planar shock wave with a Mach number of $1.21\pm 0.03$ are obtained in a single test. For comparison, numerical simulations are also performed using the two-dimensional and axisymmetric vectorized adaptive solver (VAS2D). The variations of the interface properties including the displacement, the length and the height of the distorted interfaces in the three cases are given. For the square helium cylinder, two counter-rotating vortices connected by a thin link can be observed. The height of the distorted interface always increases, and its length first decreases and then increases. In the triangle case, an air jet is formed quickly and moves downwards within the volume and eventually encounters the downstream interface, resulting in a bulge on the downstream interface. In the diamond case, the upstream interface quickly forms a re-entrant air jet similar to that in the triangle case, and the downstream interface becomes flat. The circulation in the three cases is calculated numerically, revealing the main driving mechanism of the development of the shocked polygonal interface. This work exhibits the great potential of the experimental method in studying shock–polygonal interface interactions in the case of slow/fast (air/helium) situations.
Starting Page	347
Ending Page	355
Page Count	9
File Format	PDF
ISSN	09381287
Journal	Shock Waves
Volume Number	25
Issue Number	4
e-ISSN	14322153
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-09-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Richtmyer–Meshkov instability Shock wave Polygonal helium cylinder Soap film Engineering Thermodynamics, Heat and Mass Transfer Fluid- and Aerodynamics Engineering Fluid Dynamics Thermodynamics Acoustics Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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