Accession Number:

AD0702448

Title:

DYNAMIC CHARACTERISTICS OF A 9-DEG CONE WITH AND WITHOUT ASYMMETRIES AT MACH NUMBER 10

Descriptive Note:

Final rept. 1 Nov 1968-30 Jun 1969

Corporate Author:

ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN

Personal Author(s):

Report Date:

1970-03-01

Pagination or Media Count:

24.0

Abstract:

Wind tunnel tests were conducted at Mach number 10 on a 9-deg half- angle cone model using a unique dynamic stability balance having three angular degrees of freedom. Data obtained at Re 1,970,000 on models having different types of compound asymmetries revealed vast differences in the developed motion. A model with a center-of-gravity offset and a small, out-of-plane nose slice as the second asymmetry was found to have a totally unexpected type of instability. The instability was the rapid divergence of the precession arm caused by a Magnus-type moment resulting from an out-of-plane force generated by the nose slice. When the slice was removed sharp nose model and the second asymmetry applied by using a small tab at the base, the classical roll resonance was found.

Subject Categories:

  • Aerodynamics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE