"Numerical simulations of a full three-dimensional hemispherical body in hypersonic flow are conducted and innovative techniques involving forward injection of gas from the stagnation point of the sphere are investigated; techniques include annular (ring) and swirled injection both with and without upstream energy deposition. Objectives of the analysis are the assessment of 1) drag reductions achieved on the blunt body (including the detrimental drag effect caused by the forward-facing injection itself) and 2) stability characteristics of the jet. Studies are conducted at free-stream Mach numbers of 10 and 6.5 at standard atmospheric conditions corresponding to 30 km altitude. While centered forward injection without upstream energy deposition is confirmed to be highly unstable either with or without swirl, annular ring injection exhibits a stabilizing influence on the jet. Energy deposition upstream of the body is shown to significantly enhance stability and penetration of the forward injection jet for all techniques"--Abstract, page iii.
Riggins, David W.
Isaac, Kakkattukuzhy M.
Mechanical and Aerospace Engineering
M.S. in Aerospace Engineering
Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
Missouri University of Science and Technology
vii, 36 pages
© 2011 Christopher David Marley, All rights reserved.
Thesis - Open Access
Computational fluid dynamics
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Marley, Christopher, "A numerical study of novel drag reduction techniques for blunt bodies in hypersonic flows" (2011). Masters Theses. 4956.