LAUNCHING OF FOAMED-PLASTIC MODELS WITH A TWO-STAGE LIGHT-GAS GUN
Rept. for 9 Dec 1963-1 Feb 1965
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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Techniques were developed to launch ultralightweight models i.e., densities on the order of 1 lb3 cu. ft. from a two-stage light-gas gun. To date, spheres and cones have been launched with some success. The purpose of the development was to determine whether useful aerodynamic data e.g., sphere drag could be obtained in a short aeroballistic range at pressures on the order of 0.01 mm Hg. A number of spheres were launched in support of this effort, some at pressures as low as 0.03 mm Hg. There is good agreement between these measurements of sphere drag coefficient and those produced in low-density wind tunnels. The application of this technique to a longer range having a lower pressure capability, say, 0.001 mm Hg, would permit measurements to be made in the near-free-molecule flow regime.
- Test Facilities, Equipment and Methods
- Fluid Mechanics