Measurement of Hypersonic Nearly Free Molecule Sphere Drag at Several Wall Temperature Ratios.
Abstract
Hypersonic low density sphere drag measurements were made in a nitrogen free jet at wall-to-total temperature ratios of 0.18, 0.66 and 1.0 and Knudsen numbers, based on the reflected molecule mean free path, of 0.5 to 17. The drag forces were measured with a displacement balance. A cryogenic momentum flow rate probe developed in this research was used to calibrate the free jet. Model temperatures were measured with an attached thermocouple. A parametric relationship which correlates variable wall temperature sphere drag data in the hypersonic near free molecule regime is introduced. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1972
- Accession Number
- AD0748618
Entities
People
- Thomas E. Chamberlain
Organizations
- University of California, Berkeley