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Growth of the Turbulent Inner Wake Behind Large Spheres at Supersonic Velocities
Experimental data are presented on the growth of the envelope of the turbulent inner wakes up to 3000 calibers behind 9/16, 3/4 and 2-inch spheres traveling at supersonic velocities. A description of the experimental technique and a discussion of its limitations for obtaining adequate data are given. Data are fitted to the equation r cubed 3 - bx sub e = c and the growth of the far wake is compared with theoretical predictions. Values of C sub D are computed using the coefficient b from this equation in the expression b = 1.85 KC sub D. Since there exists an aperiodic development of the wake envelope and since the small sample size of the data may bias the determination of the growth rate, the data from all available rounds were averaged to obtain values of C sub D. (Author).
Facing the Heat Barrier
Hypersonics is the study of flight at speeds where aerodynamic heating dominates the physics of the problem. Typically this is Mach 5 and higher. Hypersonics is an engineering science with close links to supersonics and engine design. Within this field, many of the most important results have been experimental. The principal facilities have been wind tunnels and related devices, which have produced flows with speeds up to orbital velocity. Why is it important? Hypersonics has had two major applications. The first has been to provide thermal protection during atmospheric entry. Success in this enterprise has supported ballistic-missile nose cones, has returned strategic reconnaissance photos ...
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Scientific and Technical Aerospace Reports
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
