MODIFICATION OF THE ROBIN METEOROLOGICAL BALLOON. VOLUME II. DRAG EVALUATIONS.
Abstract
The drag coefficients corresponding to the Mach and Reynolds number conditions imposed on a light weight sphere (Robin) falling from 330,000 ft to 260,000 ft were established experimentally in the University of Minnesota supersonic low density wind tunnel. The Reynolds number was varied from 100 to 2,500, while the Mach number was varied from 1.2 to 3.17. In addition changes to previously reported subsonic values of drag coefficients due to improved testing techniques are included. The lift and drag coefficients of a rotating sphere in subsonic flow have been measured and are compared with analytically derived values. The tests were conducted with a 6 in. model and show variation of the lift and drag depending on the ration of the rotational and lateral velocities with limiting values of 0.5 and 0.6, respectively. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1965
- Accession Number
- AD0629775
Entities
People
- E. L. Haak
- H. G. Heinrich
- L. R. Jamison
- R. J. Niccum
- R. L. George