Title

The Drag of Spheres in Rarefied Hypervelocity Flow

Date

1962

Index Abstract

Coming Soon

Photo Quality

Complete

Report Number

AEDC TDR 62-205

Creator

Kinslow, Max

Potter, J. L.

Corporate Author

ARO, Inc.

Laboratory

Arnold Engineering Development Center

Extent

58

Identifier

AD0290519

Access Rights

ASTIA

Distribution Classification

1

Contract

AF 40(600)-1000

DoD Project

8953

DoD Task

895306

DTIC Record Exists

Yes

Distribution Change Authority Correspondence

None

Abstract

Drag of spheres was measured under hypersonic, cold-wall, support-free conditions in a nonreacting (vibration frozen) flow. Data were obtained for a nominal free-stream Mach 11 and for Reynolds numbers from 1 to 10 based on conditions immediately downstream of the bow shock and sphere diameter. These data were supplemented by measurements at a nominal Mach 10 where a conventional balance was used, and Reynolds numbers downstream of the shock as high as 10,000 were investigated in the cold-wall condition. The experimental results were analyzed both from the point of view of continuum flow with second-order viscous effects, and from the standpoint of a noncontinuum concept, taking account of first collisions between reemitted and free-stream molecules. Data from other sources were used to enlarge the present study and, in particular, to support the evaluation of K2 which represents the influences of vorticity, curvature, thick boundary layer, slip, and temperature jump. K2 was found to be negative in sign. The form of the derived equation for Cd/Cd(free molecular), where Cd is the drag coefficient, Cd/Cd free molecular appears to fit the experimental data over a considerable range of Knudsen numbers if a free constant is used in the expression for mean free path.

Report Availability

Full text available

Date Issued

1962-12

Publisher

Arnold Air Force Station, TN : Arnold Engineering Development Center, Air Force Systems Command, United States Air Force

Provenance

IIT

Type

report

Format

1 online resource