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 fluctuationsInfo
- 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
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>
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)
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)
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 |
-
1984
- 1984-04-26 GB GB08410690A patent/GB2139734B/en not_active Expired
- 1984-05-04 FR FR8407001A patent/FR2545550B1/en not_active Expired
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 |