GB2224096B - Low drag surface - Google Patents

Low drag surface

Info

Publication number
GB2224096B
GB2224096B GB8209329A GB8209329A GB2224096B GB 2224096 B GB2224096 B GB 2224096B GB 8209329 A GB8209329 A GB 8209329A GB 8209329 A GB8209329 A GB 8209329A GB 2224096 B GB2224096 B GB 2224096B
Authority
GB
United Kingdom
Prior art keywords
flow
nozzle arrangement
producing means
low drag
vortices
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB8209329A
Other versions
GB2224096A (en
Inventor
John Frederick Coplin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce PLC
Original Assignee
Rolls Royce PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rolls Royce PLC filed Critical Rolls Royce PLC
Priority to GB8209329A priority Critical patent/GB2224096B/en
Publication of GB2224096A publication Critical patent/GB2224096A/en
Application granted granted Critical
Publication of GB2224096B publication Critical patent/GB2224096B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C23/00—Influencing air flow over aircraft surfaces, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C21/00—Influencing air flow over aircraft surfaces by affecting boundary layer flow
    • B64C21/02—Influencing air flow over aircraft surfaces by affecting boundary layer flow by use of slot, ducts, porous areas or the like
    • B64C21/04—Influencing air flow over aircraft surfaces by affecting boundary layer flow by use of slot, ducts, porous areas or the like for blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/04—Boundary layer controls by actively generating fluid flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/06—Boundary layer controls by explicitly adjusting fluid flow, e.g. by using valves, variable aperture or slot areas, variable pump action or variable fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/16—Boundary layer controls by blowing other fluids over the surface than air, e.g. He, H, O2 or exhaust gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/10—Drag reduction

Abstract

A low drag surface such as an aerofoil comprises at its upstream edge, an intermittent linear vortex producing means (14, 36) which extends transverse to the flow over the surface and produces a succession of rolling vortices extending transverse to said flow. The vortices move across the surface and reduce drag in the manner of roller bearings. In preferred embodiments the vortex producing means is mechanical, in the form of an oscillating part (14) or fluid dynamic, in the form of a nozzle arrangement (Fig 2, not shown). The part (14) is resiliently mounted at (15) on the main structure and oscillated by a crankshaft (20) acting via a lever (18). The nozzle arrangement uses two superimposed slits extending transversely of the flow, through which fluid is ejected alternately. <IMAGE>
GB8209329A 1982-03-30 1982-03-30 Low drag surface Expired - Fee Related GB2224096B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8209329A GB2224096B (en) 1982-03-30 1982-03-30 Low drag surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8209329A GB2224096B (en) 1982-03-30 1982-03-30 Low drag surface

Publications (2)

Publication Number Publication Date
GB2224096A GB2224096A (en) 1990-04-25
GB2224096B true GB2224096B (en) 1990-08-22

Family

ID=10529399

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8209329A Expired - Fee Related GB2224096B (en) 1982-03-30 1982-03-30 Low drag surface

Country Status (1)

Country Link
GB (1) GB2224096B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6161802A (en) * 1999-02-09 2000-12-19 Lockheed Martin Corporation Trapped vortex airfoil nose
NZ511661A (en) 2001-05-11 2003-09-26 Graham Bond Grove An improved aerofoil

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB228637A (en) * 1923-11-09 1925-02-09 Ernst Karl Alexander Baumann Improvements in and relating to the supporting planes of aeroplanes
GB415268A (en) * 1932-09-09 1934-08-23 Gian Domenico Mattioli Method of and means for increasing the efficiency of aerofoils and hydrofoils and reducing the tendency of aircraft to stall
GB670366A (en) * 1948-08-04 1952-04-16 Snecma Device for protecting against icing, and for de-icing outer elements of aircraft
GB997943A (en) * 1961-05-19 1965-07-14 Hovercraft Dev Ltd Fluid curtains for protecting or shielding a body
US3774867A (en) * 1972-06-27 1973-11-27 Us Air Force Acoustic wing stall delaying device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB228637A (en) * 1923-11-09 1925-02-09 Ernst Karl Alexander Baumann Improvements in and relating to the supporting planes of aeroplanes
GB415268A (en) * 1932-09-09 1934-08-23 Gian Domenico Mattioli Method of and means for increasing the efficiency of aerofoils and hydrofoils and reducing the tendency of aircraft to stall
GB670366A (en) * 1948-08-04 1952-04-16 Snecma Device for protecting against icing, and for de-icing outer elements of aircraft
GB997943A (en) * 1961-05-19 1965-07-14 Hovercraft Dev Ltd Fluid curtains for protecting or shielding a body
US3774867A (en) * 1972-06-27 1973-11-27 Us Air Force Acoustic wing stall delaying device

Also Published As

Publication number Publication date
GB2224096A (en) 1990-04-25

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee