TRANSIENT DRAG CHARACTERISTICS OF A SPHERICAL MODEL. Final Report
The measurement of aerodynamic drag forces exerted on simple shapes subjected to the air flow of a blast wave is described. For the test, hollow, string-mounted spheres were exposed to MET Burst. Stations comprised of one 3- in. and one 10-in. sphere were placed at ground ranges of surface on each line was different: water cover, asphalt, and untreated desert. Also, on the desert line, a station was placed at ground range of 4500 ft and the compression-beam gage was placed at 2750 ft. The blast-wave types intended on these lines were clean-air, non-precursor; clean-air precursor; dust-laden air, non-precursor; and dust-laded air, precursor. Measurements taken showed drag coefficients of the same range of magnitudes as those found in wind-tunnel work, but definite commparisons were impossible since Reynolds' Numbers and Mach Numbers were not determined. Composite plots of drag coefficient vs dynamic pressure for a given diameter gage on the desert line showed a family of similar curves. Viscosity increases postulated to account for the great disparities in measured dymamic pressures computed for unheated, clean air were on the order of l0 to 10/sup 4/. (auth)
- Research Organization:
- Ballistic Research Labs., Aberdeen Proving Ground, Md.
- NSA Number:
- NSA-16-002828
- OSTI ID:
- 4832378
- Report Number(s):
- WT-1114
- Country of Publication:
- United States
- Language:
- English
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