NDLI: Skin friction reduction by slot injection at mach 0.8

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Skin friction reduction by slot injection at mach 0.8

Content Provider	NASA Technical Reports Server (NTRS)
Author	Zakkay, V. Wang, C. R.
Copyright Year	1976
Description	Surface skin friction, boundary layer profiles and turbulent intensity due to axially symmetric tangential slot injection into a transonic boundary layer were measured. Effects of slot height, multiple slot injection, and injection mass flow rate on the surface skin friction downstream of the the slot have been investigated. Surface skin friction was a function of the injection mass flow rate for x/s 40. Large normal pressure gradient and relatively large turbulent intensity were found near the slot with small injection mass flow rate; the region the high turbulent intensity moved downstream with increasing injection mass flow rate. The results with two slot injections indicated that the distance between slots should be less than 30 slot heights in order to achieve some benefits from the first slot. Of significant importance in the present investigation is that the skin friction reduction obtained at transonic speed is of the same order as obtained in the hypersonic regime. Additional work is required in order to formulate a correlation between the turbulent intensity and the injection mass flow rate that may be used in future analysis.
File Size	1477087
Page Count	78
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19760021425
Archival Resource Key	ark:/13960/t6qz71649
Language	English
Publisher Date	1976-07-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Turbulent Boundary Layer Friction Reduction Transonic Flow Fluid Injection Skin Friction Pressure Gradients 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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