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Free-flight measurement of the drag forces on cylinders in Event Dice Throw. Technical paper

Technical Report ·
OSTI ID:5736272
;
Previous determinations of drag coefficients for both steady and unsteady flow are reviewed for all reported experiments at critical and supercritical Reynolds numbers. The unsolved problems remaining from earlier DRES work were found to be: end effects, dust drag loading, the discrepancies between steady and unsteady flow drag forces, and the need for a further data analysis. A new analysis is also presented for the drag coefficient as a function of flow Mach number and cylinder length-diameter ratio. A plan of test is presented for drag force measurements on cylinders during Event DICE THROW, a 628-ton AN/FO explosion held in October 1976. The objectives of this experiment were to provide drag force support data for the lattice mast and all antennas in Event DICE THROW, and to extend the table of data for drag coefficients to diameters up to 18 inches. The free-flight measurement technique, using both cameras and velocity transducers for data sources, was employed on seven cylinders at 20, 10 and 7 psi overpressure levels. The expected motion of each cylinder was calculated, based on the predicted value for the drag coefficient. Finally, suggestions for the data analysis and for further research in this area are discussed.
Research Organization:
Defence Research Establishment Suffield, Ralston, Alberta (Canada)
OSTI ID:
5736272
Report Number(s):
AD-A-065914
Country of Publication:
United States
Language:
English

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Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450100* -- Military Technology
Weaponry
& National Defense-- Chemical Explosions & Explosives
AMMONIUM COMPOUNDS
AMMONIUM NITRATES
ANTENNAS
BLAST EFFECTS
CANADA
CHEMICAL EXPLOSIONS
CHEMICAL EXPLOSIVES
DRAG
DUSTS
ELECTRICAL EQUIPMENT
EQUIPMENT
EXPLOSIONS
EXPLOSIVES
FUEL OILS
FUELS
NITRATES
NITROGEN COMPOUNDS
NORTH AMERICA
NUCLEAR EXPLOSIONS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
SIMULATION