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.
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Acknowledgments
The work was supported by the National Natural Science Foundation of China (11272308 and 10972214), the Knowledge Innovation Program of the Chinese Academy of Sciences (GY2011053006) and the Fundamental Research Funds for Central Universities (WK2090050020).
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Communicated by R. Bonazza.
This paper is based on work that was presented at the 29th International Symposium on Shock Waves, Madison, Wisconsin, USA, July 14–19, 2013.
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Wang, M., Si, T. & Luo, X. Experimental study on the interaction of planar shock wave with polygonal helium cylinders. Shock Waves 25, 347–355 (2015). https://doi.org/10.1007/s00193-014-0528-1
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DOI: https://doi.org/10.1007/s00193-014-0528-1