The Behaviour of Detonation Waves in Single Phase Heterogeneous Systems.
Final rept. 30 Sep 82-29 Sep 83,
UNIVERSITY COLL OF WALES ABERYSTWYTH DEPT OF PHYSICS
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Fuel-air clouds, irrespective of their method of dispersal, must inevitably be of heterogeneous composition. The objective of this study from Wales is to examine the behavior of detonation waves in such clouds. Concentration gradients of precisely known strengths are created in a vertical detonation tube by removable slides. In general the shock transmitted into an inert gas develops a secondary shock or transverse wave oscillations according as to whether the gradient is steep or gradual. The rate of adjustment of the detonation in a concentration gradient to the local CJ conditions is found to be very rapid in the system used in the investigation. By using two slide valves at varying separation the characteristics of the reinitiation mechanism following a gap of inert gas are elucidated. Keywords include Diffusion in vertical tube, wave interaction with reactiveinert gas gradient, transverse pressure waves, sympathetic detonation effects with two gradients, and rate of adjustment to localized CJ values.