NDLI: Low-speed wind-tunnel investigation of blowing boundary-layer control on leading- and trailing-edge flaps of a large-scale, low-aspect-ratio, 45 swept-wing airplane configuration

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Low-speed wind-tunnel investigation of blowing boundary-layer control on leading- and trailing-edge flaps of a large-scale, low-aspect-ratio, 45 swept-wing airplane configuration

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1959
Description	Blowing boundary-layer control was applied to the leading- and trailing-edge flaps of a 45 deg sweptback-wing complete model in a full-scale low-speed wind-tunnel study. The principal purpose of the study was to determine the effects of leading-edge flap deflection and boundary-layer control on maximum lift and longitudinal stability. Leading-edge flap deflection alone was sufficient to maintain static longitudinal stability without trailing-edge flaps. However, leading-edge flap blowing was required to maintain longitudinal stability by delaying leading-edge flow separation when trailing-edge flaps were deflected either with or without blowing. Partial-span leading-edge flaps deflected 60 deg with moderate blowing gave the major increase in maximum lift, although higher deflection and additional blowing gave some further increase. Inboard of 0.4 semispan leading-edge flap deflection could be reduced to 40 deg and/or blowing could be omitted with only small loss in maximum lift. Trailing-edge flap lift increments were increased by boundary-layer control for deflections greater than 45 deg. Maximum lift was not increased with deflected trailing-edge flaps with blowing.
File Size	909249
Page Count	28
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19980228300
Archival Resource Key	ark:/13960/t0qr9jf17
Language	English
Publisher Date	1959-01-01
Access Restriction	Open
Subject Keyword	Aerodynamics Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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