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The Static and Agnus Aerodynamic Characteristics of the M823 Research Store Equipped with Fixed and Freely Spinning Stabilizers
The report is the first in a two-part series of technical reports on the dynamics and aerodynamics of free-fall stores using freely spinning stabilizers. Presented are the results of recent wind-tunnel measurements of the normal force, pitching moment and Magnus force and moment on the M823 Research Store in transonic flow. Comparisons are made between configurations equipped with fixed and freely spinning stabilizers, with regard to sign and relative magnitude of the Magnus force and moment. A method is presented and applied whereby the Magnus force and moment are corrected for flow angularity.
Wind-tunnel Study of Oscillating Flow-induced Surface Pressures on a Tension-cone Geometry Model
Oscillating flow about a spiked body in a supersonic stream has been investigated in a wind tunnel at Mach 5 at free-stream unit Reynolds numbers of 2,500,000 to 20,000,000 per foot using fast-response pressure transducers, accelerometers and schlieren movie cameras. A tension-cone-type model with replaceable nosetips of two different lengths and two different surface roughnesses was used.
Shock Interaction Surface Pressures for Hemispherical and Conical Bodies
Transient pressures, induced by wind-tunnel simulated head-on blast wave interactions, have been measured on a hemisphere and on cones of 9-, 15- and 30-degree semivertex angles. Blast wave Mach numbers of 1.6 to 2.2, 2.2 to 5.85 and 2.7 to 4.4 were simulated at the free-stream Mach numbers of 3.1, 5.1 and 7, respectively. Measured pressure-time histories for the hemisphere were compared and found in agreement with histories predicted by McNamara's FLAME code. Peak overpressures for the cones were tested for agreement with values predicted by a simple theoretical method in which an assumption is made that the blast wave forms a Mach stem moving along the surface at a velocity whose axial component equals the velocity of the main blast wave. The effects of angle of attack and of nose blunting were also investigated with the nine-degree cone at a free-stream Mach number of 5.1. (Author).
NASA Technical Paper
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NASA Technical Paper
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