GB2139734B - Method of and apparatus for influencing the boundary layer of a body experiencing predominantly stochastic flow fluctuations - Google Patents

Method of and apparatus for influencing the boundary layer of a body experiencing predominantly stochastic flow fluctuations

Info

Publication number
GB2139734B
GB2139734B GB08410690A GB8410690A GB2139734B GB 2139734 B GB2139734 B GB 2139734B GB 08410690 A GB08410690 A GB 08410690A GB 8410690 A GB8410690 A GB 8410690A GB 2139734 B GB2139734 B GB 2139734B
Authority
GB
United Kingdom
Prior art keywords
flow
vibration
boundary layer
predominantly
stochastic
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
Application number
GB08410690A
Other versions
GB8410690D0 (en
GB2139734A (en
Inventor
Dr Werner Lurz
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.)
Airbus Defence and Space GmbH
Original Assignee
Messerschmitt Bolkow Blohm AG
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
Priority claimed from DE19833316392 external-priority patent/DE3316392A1/en
Priority claimed from DE19833316393 external-priority patent/DE3316393A1/en
Application filed by Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Publication of GB8410690D0 publication Critical patent/GB8410690D0/en
Publication of GB2139734A publication Critical patent/GB2139734A/en
Application granted granted Critical
Publication of GB2139734B publication Critical patent/GB2139734B/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/10—Influencing flow of fluids around bodies of solid material
    • F15D1/12—Influencing flow of fluids around bodies of solid material by influencing the boundary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C23/00—Influencing air flow over aircraft surfaces, not otherwise provided for
    • B64C23/005—Influencing air flow over aircraft surfaces, not otherwise provided for by other means not covered by groups B64C23/02 - B64C23/08, e.g. by electric charges, magnetic panels, piezoelectric elements, static charges or ultrasounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/02—Boundary layer controls by using acoustic waves generated by transducers
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measuring Volume Flow (AREA)

Abstract

To influence the fluid flow (having flow velocity U0) in the boundary layer of a body over the surface 8 of which the flow passes for reducing resistance or preventing flow separation, during predominantly stochastic flow fluctuations the frequency of the flow is sensed by a sensor 1. The sensed value is passed to an analyzer control circuit 2 which, in turn supplies a signal to a vibration transmitter 3 for introducing a vibration into the fluid flow for either damping or amplifying the flow. A periodic vibration of the same frequency can be superposed on the predominant stochastic frequency. In an alternative arrangement (Fig. 1) a countersignal can be impressed on the original vibration at the same location where the original vibration is sensed. <IMAGE>
GB08410690A 1983-05-05 1984-04-26 Method of and apparatus for influencing the boundary layer of a body experiencing predominantly stochastic flow fluctuations Expired GB2139734B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833316392 DE3316392A1 (en) 1983-05-05 1983-05-05 Arrangement for influencing the boundary layer of bodies in a fluid flow mainly during stochastic flow fluctuations
DE19833316393 DE3316393A1 (en) 1983-05-05 1983-05-05 Method and arrangement for influencing the boundary layer of bodies in a fluid flow mainly during stochastic flow fluctuations

Publications (3)

Publication Number Publication Date
GB8410690D0 GB8410690D0 (en) 1984-05-31
GB2139734A GB2139734A (en) 1984-11-14
GB2139734B true GB2139734B (en) 1987-05-28

Family

ID=25810556

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08410690A Expired GB2139734B (en) 1983-05-05 1984-04-26 Method of and apparatus for influencing the boundary layer of a body experiencing predominantly stochastic flow fluctuations

Country Status (2)

Country Link
FR (1) FR2545550B1 (en)
GB (1) GB2139734B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2362447B (en) * 1988-07-07 2002-03-13 Marconi Gec Ltd An interface between two media
GB2362698B (en) * 1990-10-12 2002-03-27 Marconi Gec Ltd An interface between two media
GB9118646D0 (en) * 1991-08-30 1992-02-19 Ruston Gas Turbines Ltd Flow control arrangement
GB9121455D0 (en) * 1991-10-10 1991-11-27 Rolls Royce Plc Control of boundary layer flow
DE59510549D1 (en) * 1995-03-14 2003-03-13 Sulzer Markets & Technology Ag Method for actively damping global flow oscillations in separated unstable flows and device for applying the method
DE10132069A1 (en) * 2001-07-05 2003-01-16 Buehler Ag Method for influencing the rheological properties of a fluid

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3362663A (en) * 1966-03-23 1968-01-09 Boeing Co Reduction of turbulence and drag by mechanical vibrations
DE3228939C1 (en) * 1982-08-03 1983-11-24 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Method and device for influencing the boundary layer of flowed bodies

Also Published As

Publication number Publication date
GB8410690D0 (en) 1984-05-31
FR2545550B1 (en) 1986-12-26
GB2139734A (en) 1984-11-14
FR2545550A1 (en) 1984-11-09

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Legal Events

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

Effective date: 20010426