Accession Number : AD0467533

Title :   FIELD TESTING OF INSTRUMENTS FOR MEASUREMENT OF DUSTY AIRBLAST EFFECTS.

Descriptive Note : Final rept., 1 Jun 64-15 Jun 65 on phases 6 and 7,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CA

Personal Author(s) : Witherly, T. Dexter

Report Date : 15 JUN 1965

Pagination or Media Count : 66

Abstract : Newly developed airblast instrumentation and a surface shear gage were field-tested for the first time in a 500-ton surface TNT detonation (Operation Snowball). Above ground measurements of dynamic pressure of the air, dust momentum flux and drag on a cylinder, and sub-surface measurements of shear stress in the soil were made at four distances from ground zero. Dynamic pressure and dust momentum flux were measured at each station by a single gage, the SRI-MAD gage, designed to measure these two blast wave parameters independently. Reasonable results were obtained from the total drag gages and a drag coefficient of 2.0 is indicated (based on clean air dynamic pressure). However this drag could not be checked by independent measurement of the air and dust parameters, because excessive crater ejecta plugged three of the four MAD gages and prevented the dust samplers from functioning properly. (Author)

Descriptors :   (*EXPLOSIVES, AIRBURST), (*TNT, EXPLOSION EFFECTS), (*BLAST, MEASUREMENT), DUST, COMPUTER PROGRAMMING, REYNOLDS NUMBER, GAS FLOW, CALIBRATION, MEASURING INSTRUMENTS, CRATERING, SHEAR STRESSES, PITOT TUBES, EJECTION, PRESSURE GAGES.

Distribution Statement : APPROVED FOR PUBLIC RELEASE