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Mixing layer control for tangential slot injection in turbulent flowsTangential injection into turbulent flows is one of the most promising methods of minimizing skin friction and providing thermal protection. The technique also has application to laser hardening. The effectiveness of the injected material can be increased if the spreading rate of the resulting mixing region can be reduced. Various techniques which have been shown to be effective in manipulating the rate of growth of mixing layers under certain conditions have been applied to a slot configuration having a thick external turbulent boundary layer. These include geometry modifications to the slot lip trailing edge and acoustic excitation of the slot exit plane over a wide range of frequencies. Neither of these approaches produced any noticeable effect on the downstream evolution of the mixing layer. This lack of effectiveness is attributed to the dominating influence of the well-developed incoming turbulent boundary layer. The placement of large-eddy breakup devices in this boundary layer upstream of the injection point did produce significantly lower velocities in the near-wall region of the flow downstream of the slot exit.
Document ID
19850043786
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mcinville, R. M.
(U.S. Navy, Naval Surface Weapons Center Dahlgren, VA; North Carolina State University, Raleigh, NC, United States)
Goodman, W. L.
(NASA Langley Research Center High-Speed Aerodynamics Div., Hampton, VA, United States)
Hassan, H. A.
(North Carolina State University Raleigh, NC, United States)
Date Acquired
August 12, 2013
Publication Date
March 1, 1985
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 85-0541
Accession Number
85A25937
Funding Number(s)
CONTRACT_GRANT: NCC1-22
Distribution Limits
Public
Copyright
Other

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