Accession Number:

AD0610481

Title:

DRAG-FORCE MEASUREMENTS

Descriptive Note:

Rept. for Feb-May 1955

Corporate Author:

NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s):

• Kornhauser, M.
• Petes, J.

Report Date:

1958-06-13

Pagination or Media Count:

137.0

Abstract:

A three-component force gage suitable for measurement of transient aerodynamic drag loads on sting-mounted models was successfully developed and used on Shot 12 of Operation Teapot. Comparison of peak forces at a 3foot height over three surfaces indicated the highest forces in the dusty desert area, with lower forces in inconclusive order over the asphalt and water areas. It was not considered valid to calculate field drag coefficients from the force and q dynamic pressure data. Laboratory investigation revealed the high sensitivity of the spheresting configuration to angle of flow and the difficulty of determining the actual angle of flow from the orthogonal force components. It was concluded that on Shot 12 at the 3-foot height the air flow in the blast was parallel to the ground and directed radially outward from ground zero. The spherical force gages were tested in wind tunnel and shock tubes in the range of Mach numbers from 0.2 to 0.7, with Reynolds numbers from about 3 x 10 to the 5th to 6th powers shock overpressures from about 2 to 20 psi. Fair agreement is obtained between windtunnel and shock-tube drag coefficients.

Descriptors:

• *FLUID DYNAMICS
• *DRAG
• *NUCLEAR EXPLOSION DAMAGE
• *FORCE(MECHANICS)
• MATHEMATICAL MODELS
• NUCLEAR EXPLOSIONS
• SIMULATION
• MEASUREMENT
• GAS FLOW
• NEVADA
• SHOCK TUBES
• DESERTS
• WIND TUNNELS
• WATER
• ASPHALT
• TARGETS
• DUST
• MEASURING INSTRUMENTS

Subject Categories:

• Nuclear Weapons

Distribution Statement:

APPROVED FOR PUBLIC RELEASE