WIND TUNNEL TESTS ON THE APACHE SOUNDING ROCKET WITH VARIOUS SPIN RATES AT SUPERSONIC SPEEDS
ARO INC ARNOLD AFS TN
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Aerodynamic characteristics were investigated for a 0.355-scale model of the Apache sounding rocket at Mach numbers 2 to 6. Free-stream Reynolds number, based on model length, was varied between 6,500,000 and 23,900,000, and angle of attack varied from -5 to 15 deg. The model was tested without fins at spin rates up to 4,000 rpm and with fins at cant angles of 0, -1, and plus or minus 2 deg, which produced spin rates ranging from about -3200 to 3200 rpm. Tests of the complete spinning model showed significant changes in side loading with angle of attack, Mach number, and Reynolds number. Tests of the model with and without fins allowed a degree of accessment of the relative body and fin Magnus contributions. Tests of the nonspinning model with and without fins showed significant side loads attributed to steady asymmetric leeward vortex patterns.
- Fluid Mechanics