Аннотация:A series of 0.2- to 3-gm HNS charges were detonated in vacuums of 10−3 to 10−5 Torr. The resultant freely expanding, detonation product, gas blast achieves terminal velocities of 8 to 12 km/sec within 3 to 5 μsec after the detonation wave arrives at the free surface. Measured pressure profiles display rise times to maximum stagnation (``reflected shock'') pressure varying from ∼30 μsec, 20-cm away from a 2.6-gm charge, to ∼185 μsec, 127-cm away from 0.2-gm charge at 10−5 Torr. Rise times were generally shorter at 10−3 and 10−4 Torr; the 10−5 Torr values agree with numerical calculations. Using cube root scaling of charge mass, the observed peak reflected pressure as a function of range may be represented by p=6.5×105 (bar) r′−3.5,where r′ the ratio of the range to the equivalent charge radius.
