Photogrammetry of the Particle Trajectories on Dipole West Shots 8, 9, 10, and 11. Volume I. Shot 10.

摘要

This report describes the photogrammetry and analysis of the particle trajectories in blast waves produced by the simultaneous detonation of pairs of spherical 1080 lb Pentolite charges. Four experiments were carried out. In two of the experiments one of the charges was positioned at a height of 25 feet above the ground and the second charge 50 feet above the first. In the other two experiments the corresponding distances were 15 feet and 30 feet. For each charge configuration, one experiment was carried out over smooth ground and the other over rough ground. In each of the four experiments conducted, photogrammetrical measurements were made of the trajectories of air particle tracers (smoke puffs), which had been placed in a vertical grid at heights ranging from 3 feet to 58 feet above the ground and at radial distances ranging from 25 feet to 140 feet from the vertical axis through the charges. From the measured particle trajectories, calculations were made of the particle velocities, densities, hydrostatic overpressures, and dynamic pressures throughput the blast wave, at times ranging from 3 ms to 100 ms after detonation of the charges. Also determined from the photogrammetrical measurements were the shock front times-of-arrival.