SPECIAL MEASUREMENTS OF DYNAMIC PRESSURE VERSUS TIME AND DISTANCE
Abstract
Pitch and yaw of shock afterflow as a function of time, dynamic pressure parameters, and the contributions of air and dust to dynamic pressure were measured over desert, asphalt, and water surfaces during a nuclear explosion. Little or no yaw of flow was detected, but pitch of flow was found to be considerable over all three surfaces to 2,500 feet from ground zero. Over desert and asphalt, pitch-time records displayed a consistent pattern of initial upward flow followed by horizontal flow, or at 2,500-foot stations, downward flow. Pitch-time records over water are erratic and little understood. Air dynamic pressures at 3-foot elevations, 2,000 and 2,500 feet from ground zero, were highest over desert and higher over asphalt than water. Considerable dust loading occurred on the desert where dust dynamic pressure exceeded that of air. Particle loading was present over asphalt, but the extent was not determined. No tangible evidence of water loading was found. Results suggest that high air dynamic pressures over desert and asphalt arise from air velocities higher than would be expected from the Rankine Hugoniot relations and measured overpressures.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1958
- Accession Number
- AD0617155
Entities
People
- F. H. Shelton
- J. R. Banister