Accession Number:

AD0739250

Title:

Drag Coefficients of Spheres in Hypersonic Non-Continuum Flow.

Descriptive Note:

Final rept. 1 Oct 68-31 Jul 70,

Corporate Author:

VON KARMAN INST FOR FLUID DYNAMICS RHODE-SAINT-GENESE (BELGIUM)

Personal Author(s):

Report Date:

1971-11-30

Pagination or Media Count:

43.0

Abstract:

A modulated force probe with a sensitivity in the microgram range was employed to measure the drag forces on spheres in the Mach 5 range with an R.M.S. error of or - 1. Flow properties in the free jet were used to calculate sphere drag coefficients. The resulting values cover the flow regimes from near-free-molecule to transitional. A correlation parameter - an effective Knudsen number based on body-free stream molecular collisions - is shown to provide a reasonable correlation for a large variety of sphere drag measurements.

Subject Categories:

  • Guided Missile Reentry Vehicles
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE