NDLI: Direct measurements and analysis of skin friction and cooling downstream of multiple flush-slot injection into a turbulent mach 6 boundary layer

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Direct measurements and analysis of skin friction and cooling downstream of multiple flush-slot injection into a turbulent mach 6 boundary layer

Content Provider	NASA Technical Reports Server (NTRS)
Author	Howard, F. G. Strokowski, A. J.
Copyright Year	1978
Description	Experiments were conducted to determine the reduction in surface skin friction and the effectiveness of surface cooling downstream of one to four successive flush slots injecting cold air at an angle of 10 deg into a turbulent Mach 6 boundary layer. Data were obtained by direct measurement of surface shear and equilibrium temperatures, respectively. Increasing the number of slots decreased the skin friction, but the incremental improvement in skin-friction reduction decreased as the number of slots was increased. Cooling effectiveness was found to improve, for a given total mass injection, as the number of slots was increased from one to four. Comparison with previously reported step-slot data, however, indicated that step slots with tangential injection are more effective for both reducing skin friction and cooling than the present flush-slot configuration. Finite-difference predictions are in reasonable agreement with skin-friction data and with boundary-layer profile data.
File Size	6696795
Page Count	114
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19780025442
Archival Resource Key	ark:/13960/t14n4078c
Language	English
Publisher Date	1978-10-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Friction Reduction Surface Cooling Cold Gas Drag Reduction Skin Friction Finite Difference Theory Turbulent Boundary Layer Data Processing Friction Measurement Film Cooling Fluid Injection Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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