COMBUSTION-DETONATION TRANSITION OF A POWDERED EXPLOSIVE LAYER IN A LARGE SIZED TUBE

Experiments are carried out on the combustion-detonation transition of freely-poured layers of hexogen, octogen, and TEN, as well as mixture s of hexogen with concentrated nitric acid and octogen with acetone in tubes up to 7 m long with diameters up to 0.094 m. Calculations are p erformed and the asymptotic combustion-detonation transition condition is obtained in the form of the limiting tube length at which the velo city of the gas flow with suspended burning explosive particles become s infinite. The value of the Reynolds number at the tube output is det ermined for constant combustion surface. It is shown that for Re > 11, 500 at sufficiently high explosive layer thickness the transition occu rs practically without fail.