The Blast Wave from Deflagrative Explosions, an Acoustic Approach
Interim rept. 1 Jun 1978-31 May 1979
ILLINOIS UNIV AT URBANA DEPT OF AEROSPACE ENGINEERING
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Simple acoustic source theory has been applied to determine the maximum overpressure obtainable by the deflagration of nonspherical clouds. In three dimensions overpressure is generated not by the rate of energy addition but by the first time derivative of the rate. Because of this, deflagrative combustion of edge-ignited clouds produces markedly less overpressure than central, spherical ignition. Examples are presented for three nonspherical cloud and igniter geometries. The implication is that even high velocity, subsonic combustion waves cannot produce damaging blast waves and that some type of supersonic combustion or massive flame acceleration is required if a damaging blast wave is to be produced.
- Combustion and Ignition