Accession Number:

AD0748618

Title:

Measurement of Hypersonic Nearly Free Molecule Sphere Drag at Several Wall Temperature Ratios.

Descriptive Note:

Technical rept.,

Corporate Author:

CALIFORNIA UNIV BERKELEY FLUID MECHANICS DIV

Personal Author(s):

Report Date:

1972-03-01

Pagination or Media Count:

94.0

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

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE