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DE19843195A1 - Method for reducing friction losses with moving fluids involves introduction of air or other gas-form medium through perforated surface - Google Patents

Method for reducing friction losses with moving fluids involves introduction of air or other gas-form medium through perforated surface

Info

Publication number
DE19843195A1
DE19843195A1 DE19843195A DE19843195A DE19843195A1 DE 19843195 A1 DE19843195 A1 DE 19843195A1 DE 19843195 A DE19843195 A DE 19843195A DE 19843195 A DE19843195 A DE 19843195A DE 19843195 A1 DE19843195 A1 DE 19843195A1
Authority
DE
Germany
Prior art keywords
air
gas
friction losses
perforated surface
form medium
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.)
Withdrawn
Application number
DE19843195A
Other languages
German (de)
Inventor
Ullrich Meyer
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 DE19843195A priority Critical patent/DE19843195A1/en
Publication of DE19843195A1 publication Critical patent/DE19843195A1/en
Withdrawn legal-status Critical Current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
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
    • B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
    • B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/28—Other means for improving propeller efficiency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
    • F03B11/002—Injecting air or other fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/10—Geometry two-dimensional
    • F05B2250/19—Geometry two-dimensional machined; miscellaneous
    • F05B2250/191—Geometry two-dimensional machined; miscellaneous perforated
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy
    • 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
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/10—Measures concerning design or construction of watercraft hulls

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The introduction of air or other gas-form medium through a perforated surface reduces the friction losses between a wall and a moved fluid or between a moved wall and a fluid surrounding it. With the same method, cavitation damage can be reduced with fast-running turbine blades or ship propellers.

Description

Die Erfindung betrifft Grenzflächen zwischen einer festen Fläche (Wand) und einem bewegten, flüssigen Medium. An diesen Grenzflächen tritt Reibung auf, die die Fließgeschwindigkeit ver­ mindert und einen Energieverlust darstellt.The invention relates to interfaces between a fixed surface (wall) and a moving, liquid medium. Friction occurs at these interfaces, which verifies the flow velocity reduces and represents a loss of energy.

Stand der Technik sind strukturierte Oberflächen, die durch Bildung von Mikrowirbeln die Entstehung von größeren Wirbeln vermeiden und damit die Gesamtverluste reduzieren. Der Erfindung liegt das Ziel zugrunde, durch Einleitung von Luft oder eines anderen gasförmi­ gen Mediums in diese Grenzflächen partiell die Flüssigkeit von der Wand abzulösen und damit die Reibung zu vermindern.State of the art are structured surfaces which are formed by the formation of micro-vortices Avoid the formation of larger eddies and thus reduce overall losses. The invention is based, by introducing air or another gaseous object medium to partially detach the liquid from the wall in these interfaces and thus reduce the friction.

Dies wird erfindungsgemäß dadurch gelöst, daß die feste Fläche perforiert ist und durch die Öffnungen Luft oder ein anderes gasförmiges Medium eingeleitet wird. Die entstehenden kleinen Luft- bzw. Gasblasen vermindern die reibungsaktive Fläche. Ist die Wand strukturiert und weist Rillen in Fließrichtung auf, so können durch Perforationsöffnungen in den "Rillen­ tälern" die entstehenden Gasbläschen längere Zeit in dieser Rille gehalten werden und sich zu größeren Gasblasen entwickeln.This is achieved according to the invention in that the solid surface is perforated and through the Openings air or another gaseous medium is introduced. The emerging Small air or gas bubbles reduce the frictional area. Is the wall structured? and has grooves in the direction of flow, so through perforations in the "grooves valleys "the resulting gas bubbles are held in this groove for a long time and become closed develop larger gas bubbles.

In der Regel wird hierzu eine doppelwandige Begrenzungsfläche notwendig sein, wobei in die Zwischenwand Luft oder ein anderes gasförmiges Medium gepreßt wird.As a rule, a double-walled boundary surface will be necessary for this, with the Partition air or another gaseous medium is pressed.

Bei Erdölpipelines könnte z. B. Erdgas dieses gasförmige Medium sein, welches dann in ent­ sprechenden Abständen wieder vom Öl getrennt wird und erneut in die Doppelwand gepreßt werden kann.In oil pipelines, e.g. B. natural gas this gaseous medium, which is then in ent speaking distances is separated from the oil again and pressed into the double wall can be.

Analog gilt dies auch für bewegte Wände in Flüssigkeiten z. B. für den unter Wasser liegenden Teil eines Schiffsrumpfes.Analogously, this also applies to moving walls in liquids such. B. for the underwater Part of a hull.

Bei Schiffsschrauben, Turbinenschaufeln u.ä. können durch Einleitung von Luft durch die Schaufelblätter in die Unterdruckbereiche Kavationsschäden verhindert oder vermindert werden.For ship propellers, turbine blades, etc. can by introducing air through the Airfoils in the negative pressure areas prevent or reduce cavitation damage become.

Claims (2)

1. Grenzflächen zwischen einer Fläche aus festem Material und einer bewegten Flüssigkeit, dadurch gekennzeichnet, daß die Fläche Öffnungen enthält und aus den Öffnungen ein gasförmiges Medium in die Flüssigkeit eingeleitet wird mit dem Ziel, die Reibungsverluste zu vermindern.1. interfaces between a surface made of solid material and a moving liquid, characterized in that the surface contains openings and a gaseous medium is introduced into the liquid from the openings with the aim of reducing the friction losses. 2. Schnellbewegte in einer Flüssigkeit laufende Maschinenteile dadurch gekennzeichnet, daß sie Öffnungen enthalten, aus denen ein gasförmiges Medium in die Flüssigkeit eingeleitet wird, um Kavationsschäden zu vermeiden.2. Fast moving machine parts running in a liquid, characterized in that they contain openings from which a gaseous medium is introduced into the liquid to avoid cavitation damage.
DE19843195A 1998-09-15 1998-09-15 Method for reducing friction losses with moving fluids involves introduction of air or other gas-form medium through perforated surface Withdrawn DE19843195A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19843195A DE19843195A1 (en) 1998-09-15 1998-09-15 Method for reducing friction losses with moving fluids involves introduction of air or other gas-form medium through perforated surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843195A DE19843195A1 (en) 1998-09-15 1998-09-15 Method for reducing friction losses with moving fluids involves introduction of air or other gas-form medium through perforated surface

Publications (1)

Publication Number Publication Date
DE19843195A1 true DE19843195A1 (en) 2000-03-16

Family

ID=7881676

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19843195A Withdrawn DE19843195A1 (en) 1998-09-15 1998-09-15 Method for reducing friction losses with moving fluids involves introduction of air or other gas-form medium through perforated surface

Country Status (1)

Country Link
DE (1) DE19843195A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE659257C (en) * 1933-10-07 1938-04-29 Maschf Ventilation device to avoid shocks and corrosion caused by cavitation in dripping liquids as a result of the flow being released
US3040760A (en) * 1957-04-04 1962-06-26 Macks Elmer Fred Conduit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE659257C (en) * 1933-10-07 1938-04-29 Maschf Ventilation device to avoid shocks and corrosion caused by cavitation in dripping liquids as a result of the flow being released
US3040760A (en) * 1957-04-04 1962-06-26 Macks Elmer Fred Conduit

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Legal Events

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8130 Withdrawal