“A study on the use of upstream focused power deposition to reduce blunt body drag in hypersonic flow at 30-kilometer altitude is presented. A full Navier- Stokes time-marching computational fluid dynamics code, SPARK, is used to determine the effectiveness of focused energy addition to reduce drag for a representative blunt body. Modification of the pressure distribution around the body due to the energy deposition results in lower drag, similar to that obtained from an upstream spike attached to the body. The research demonstrates the effect of moving the deposition point along the upstream centerline on drag reduction and identifies an optimal location for energy deposition for maximum wave drag reduction as x/d = -1.94. It is found that higher energy deposition rates result in lower wave drag; however, the energy cost per unit drag reduction increases with increased energy deposition rate. In order to study the effects of focus, the energy deposition volume density was varied for a specific deposition rate. The drag changed very little for a range of energy deposition densities from 15.30 to 133.02 kW/mm2, indicating that the focus of the energy deposition is not a critical design factor”--Abstract, page iii.
Nelson, Harlan F., 1938-2005
Riggins, David W.
Grow, David E.
Mechanical and Aerospace Engineering
M.S. in Aerospace Engineering
University of Missouri--Rolla
ix, 59 pages
© 2001 Eric Edward Johnson, All rights reserved.
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Johnson, Eric Edward, "An investigation into the drag reduction effects of focused energy deposition on hypersonic blunt bodies" (2001). Masters Theses. 2007.
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