GB578763A - Improvements in or relating to fluid-solid contact-surfaces - Google Patents
Improvements in or relating to fluid-solid contact-surfacesInfo
- Publication number
- GB578763A GB578763A GB11973/42A GB1197342A GB578763A GB 578763 A GB578763 A GB 578763A GB 11973/42 A GB11973/42 A GB 11973/42A GB 1197342 A GB1197342 A GB 1197342A GB 578763 A GB578763 A GB 578763A
- Authority
- GB
- United Kingdom
- Prior art keywords
- slot
- pressure
- slots
- fluid
- stagnation point
- 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
- 239000007787 solid Substances 0.000 title abstract 2
- 239000012530 fluid Substances 0.000 abstract 3
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000011144 upstream manufacturing Methods 0.000 abstract 1
Classifications
-
- 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
- B64C21/06—Influencing air flow over aircraft surfaces by affecting boundary layer flow by use of slot, ducts, porous areas or the like for sucking
-
- 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
-
- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Aviation & Aerospace Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
578,763. Reducing surface friction between a solid and a fluid. GRIFFITH, A. A. Aug. 25, 1942, No. 11973. [Class 4] To improve the effect of slots provided for the removal by suction of the boundary layer of fluid from surfaces such as those of aeroplanes, pumps, compressors and turbines, that are movable relatively to the fluid, the surface is so shaped that no rise of pressure occurs on the surface in the general direction of flow except in the region between a slot and its associated stagnation point where the flow of the boundary layer is locally reversed in direction. This may be done by providing that the surface curvature suddenly changes in passing across the slot so that it is less convex on the downstream side of the slot. In the example shown, the parts 23, 24 of the surface on the upstream and downstream side of a slot 13 are convex and concave respectively and the slot is tangential to the curve 24. There is thus no rise of pressure except as shown by the pressure curve P at 19, between the slot and the stagnation point 18 and the pressure falls gradually as indicated at 25, from the stagnation point to the next slot downstream. A fan 26 is provided for producing suction in the slots. With a surface and slots so formed and arranged, there is no fall and subsequent rise of pressure between the stagnation point and the next slot such as is shown to exist with the usual slotted surface. In a modification, the slots are wider than is necessary for the removal of the boundary layer and there is a sharp edge between the convex surface 23 and the upper flat wall of the slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB11973/42A GB578763A (en) | 1942-08-25 | 1942-08-25 | Improvements in or relating to fluid-solid contact-surfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB11973/42A GB578763A (en) | 1942-08-25 | 1942-08-25 | Improvements in or relating to fluid-solid contact-surfaces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB578763A true GB578763A (en) | 1946-07-11 |
Family
ID=9996062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11973/42A Expired GB578763A (en) | 1942-08-25 | 1942-08-25 | Improvements in or relating to fluid-solid contact-surfaces |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB578763A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1827970A2 (en) * | 2004-12-23 | 2007-09-05 | David Birkenstock | Apparatus, system and method for drag reduction |
| US8746624B2 (en) | 2008-05-23 | 2014-06-10 | David Birkenstock | Boundary layer control system and methods thereof |
| US10204192B2 (en) | 2007-09-17 | 2019-02-12 | David T Birkenstock | System and method for drag reduction |
-
1942
- 1942-08-25 GB GB11973/42A patent/GB578763A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1827970A2 (en) * | 2004-12-23 | 2007-09-05 | David Birkenstock | Apparatus, system and method for drag reduction |
| EP1827970A4 (en) * | 2004-12-23 | 2012-01-25 | David Birkenstock | Apparatus, system and method for drag reduction |
| US9764823B2 (en) | 2004-12-23 | 2017-09-19 | David Birkenstock | Apparatus, system and method for drag reduction |
| US10377471B2 (en) | 2004-12-23 | 2019-08-13 | David Birkenstock | Apparatus, system and method for drag reduction |
| US10204192B2 (en) | 2007-09-17 | 2019-02-12 | David T Birkenstock | System and method for drag reduction |
| US8746624B2 (en) | 2008-05-23 | 2014-06-10 | David Birkenstock | Boundary layer control system and methods thereof |
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