DYNAMIC CHARACTERISTICS OF A 9-DEG CONE WITH AND WITHOUT ASYMMETRIES AT MACH NUMBER 10
Final rept. 1 Nov 1968-30 Jun 1969
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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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.
- Fluid Mechanics