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The Air Velocity and Density in Blast Waves from TNT Explosions

John M. DeweyDefence Research Establishment Suffield

出版	Canada. Defence Research Board, 1964
URL	http://books.google.com.hk/books?id=MKfh8QTZqV0C&hl=&source=gbs_api

註釋The air velocity has been measured in blast waves produced by the detonation of TNT charges varying in mass from 30 lb to 200,000 lb. The technique consists essentially of using high speed cameras to record the displacement of smoke trails formed close to the charge just before detonation. The velocity is determined by differentiation of equations fitted by least squares to the displacement-time data. The initial decay of velocity behind the shock agrees well with theoretical predictions, such as those of Brode (1959), but at later times there is an extended period of outward flow, which, it is postulated, is caused by the 'after-burning' of the detonation products in the presence of atmospheric oxygen. It has been shown that this phenomenon does not occur in the case of the detonation of an explosive with an excess of oxygen, or for a nuclear detonation.