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High energy concentration by symmetric shock focusing
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.
2013 (English)In: Shock Waves, ISSN 0938-1287, E-ISSN 1432-2153, Vol. 23, no 4, 361-368 p.Article in journal (Refereed) Published
Abstract [en]

High-energy concentrations in gas are achieved experimentally in a specially constructed shock tube facility at KTH Mechanics. The high-energy concentration is manifested by a formation of a hot, light-emitting gas core. Experimental, numerical and theoretical investigations show that the shape of the imploding shock is of pivotal importance for the final energy concentration. Cylindrical shocks are unstable. Symmetric polygonal shocks are shown to be dynamically stable and are produced by various methods, e.g. thin wing profiles placed radially in the test section. Such symmetric polygonal shocks are able to produce extremely high energy levels at the focal point. Spectral data from 60 nanosecond short intervals of 8 microsecond light pulse give temperatures in the range of 6,000 K.

Place, publisher, year, edition, pages
2013. Vol. 23, no 4, 361-368 p.
Keyword [en]
Energy concentration, Shock focusing, Symmetric, Temperature
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-134155DOI: 10.1007/s00193-013-0442-yISI: 000320370500009ScopusID: 2-s2.0-84878784140OAI: diva2:665031
Swedish Research Council

QC 20131118

Available from: 2013-11-18 Created: 2013-11-18 Last updated: 2013-12-10Bibliographically approved

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