National_Catalogues: Active and Passive Control of Supersonic Wakes: Numerical Investigations using DNS and LES
Title:
Active and Passive Control of Supersonic Wakes: Numerical Investigations using DNS and LES
Identifier:
ADA500605
STOAbstractExternal:
At supersonic speed the base drag of blunt axisymmetric bodies can makeup a substantial fraction of the total drag. A reduction of the base drag is highly desirable as it would considerably improve aerodynamic performance. We employed computational fluid dynamics for investigating transitional supersonic axisymmetric wakes at a freestream Mach number of M=2.46 and a Reynolds number based on diameter of Re_D=100,000. For these simulations, to lower the grid resolution requirement we employed a hybrid turbulence model, the flow simulation methodology. We investigated flow control mechanisms that alter the near wake by introducing time-periodic and steady, axisymmetric and longitudinal perturbations into the approach boundary layer. The objective of our research was to understand how the various active and passive flow control techniques affect the flow dynamics, in particular the low wave number azimuthal modes which in our earlier research was found to be primarily responsible for the low base pressure. We also investigated passive control using steady basebleed.
STOAuthorExternal:
ARIZONA UNIV TUCSON, Fasel, Hermann F.
STOClassificationExternal:
N
STOKeywordsExternal:
: *SUPERSONIC WAKES, *AXISYMMETRIC WAKES, SUPERSONIC BASE FLOWS, AXISYMMETRIC BASE FLOWS, FLOW CONTROL, PE611102A
STOPublisher:
USA
Language:
English
STOReportSource:
http://www.dtic.mil/docs/citations/ADA500605
Published:
6/1/2008
Created at 11/9/2016 3:26 PM by System Account
Last modified at 11/9/2016 3:26 PM by System Account
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