GROWTH OF BURNING TO DETONATION IN LIQUIDS AND SOLIDS,
CAVENDISH LAB UNIV OF CAMBRIDGE (ENGLAND)
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Explosion in nitroglycerine by impact was recorded using a high-speed C sub 4 framing camera. The introduction of inhomgeneities favours the formation of localised concentrations of energy in the form of hot spots, at which chemical reaction can be initiated. In the early stages the chemical reaction propagates as an accelerating fast burning at up to several hundreds of netres per second. It appears that certain conditions e.g. turbulence, and the formation of a mixture of liquid droplets, unreacted nitroglycerine vapour and hot gaseous products are essential for subsequent transition from this regime to a more violent explosion. The study of fracture propagation was concentrated on single crystals of magnesium oxide, using high-speed photography Beckman and Whitley and independently an ultrasonic method. High-speed photographic records using a Beckman and Whitley camera were made of the deflagration and detonation of single crystals of P.E.T.N., R.D.X., H.M.X., and silver azide. New theories of initiation of explosion by light and of the growth and decay of hot-spots in condensed explosives were developed.
- Combustion and Ignition