GB610622A - Improvements in and relating to solid boundary surfaces for fluid streams - Google Patents

Improvements in and relating to solid boundary surfaces for fluid streams

Info

Publication number
GB610622A
GB610622A GB11197/46A GB1119746A GB610622A GB 610622 A GB610622 A GB 610622A GB 11197/46 A GB11197/46 A GB 11197/46A GB 1119746 A GB1119746 A GB 1119746A GB 610622 A GB610622 A GB 610622A
Authority
GB
United Kingdom
Prior art keywords
porous
boundary layer
fluid
suction
aerofoil
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
GB11197/46A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB11197/46A priority Critical patent/GB610622A/en
Publication of GB610622A publication Critical patent/GB610622A/en
Expired legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/22—Boundary layer controls by using a surface having multiple apertures of relatively small openings other than slots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/28—Boundary layer controls at propeller or rotor blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
    • B64D33/02—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
    • B64D2033/0226—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes comprising boundary layer control means
    • 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
    • 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
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Abstract

610,622. Reducing surface friction; boundary layer control. PRESTON, J. H., and THWAITES, B. April 11, 1946, No. 11197. [Class 4] Separation of the boundary layer of a fluid stream moving over a solid surface is prevented by forming the surface of porous material, the linear size and spacing of whose pores are small compared with the thickness of the fluid boundary layer, means being provided for applying suction to the fluid through the pores of the material. The pore size and spacing are of the order of one-hundredth of the boundary layer thickness and do not exceed onefiftieth thereof. The invention may be applied to aerofoils, propeller blades, blading for fans, compressors or turbines, aircraft bodies, engine nacelles, submarine hulls, or ducts or channels in which fluid flow is confined, such as diffusers for compressors and pumps, or the walls of wind tunnels. Suitable surface materials are sintered metal sheet or fine metal gauze bent to the desired shape, or a mould of the desired form may be sprayed to produce a porous metal layer. Fig. 1 shows a thick-section symmetrical aerofoil in which the upper and lower surfaces 5 of the rearward quarter-chord are of finely porous material, a space 6 being formed below the porous covering by an internal partition 7, the space being connected to a suction pump P by ducts D. In the embodiment according to Fig. 3, the porous surface layer 12 extends between the points 10 and 11 at the leading edge of a thin symmetrical aerofoil. In order to preserve laminar flow, the porous areas of the surfaces of the aerofoils may be more extensive than illustrated, and an aerofoil may even be provided with a porous surface throughout. Fig. 5 shows a symmetrical rectangular-section channel or duct in which the portions S of the walls W over which the velocity gradient is steeply negative are of porous material, to which suction is applied. Variation of the applied suction head may be obtained by partitioning the space below the porous area and applying different heads to the several compartments, or the degree of porosity of the surface material may be varied appropriately. Specification 479,598 is referred to, and the Provisional Specification refers to Specification 578,763.
GB11197/46A 1946-04-11 1946-04-11 Improvements in and relating to solid boundary surfaces for fluid streams Expired GB610622A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB11197/46A GB610622A (en) 1946-04-11 1946-04-11 Improvements in and relating to solid boundary surfaces for fluid streams

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11197/46A GB610622A (en) 1946-04-11 1946-04-11 Improvements in and relating to solid boundary surfaces for fluid streams

Publications (1)

Publication Number Publication Date
GB610622A true GB610622A (en) 1948-10-19

Family

ID=9981801

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11197/46A Expired GB610622A (en) 1946-04-11 1946-04-11 Improvements in and relating to solid boundary surfaces for fluid streams

Country Status (1)

Country Link
GB (1) GB610622A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708556A (en) * 1951-11-23 1955-05-17 Chance Vought Aircraft Inc Aircraft gust damper
US8286909B2 (en) 2008-02-08 2012-10-16 Stratocomm Corporation Boundary layer propulsion airship with related system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708556A (en) * 1951-11-23 1955-05-17 Chance Vought Aircraft Inc Aircraft gust damper
US8286909B2 (en) 2008-02-08 2012-10-16 Stratocomm Corporation Boundary layer propulsion airship with related system and method

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