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WO2005057019A1 - Procede de refroidissement - Google Patents

Procede de refroidissement Download PDF

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Publication number
WO2005057019A1
WO2005057019A1 PCT/CH2004/000698 CH2004000698W WO2005057019A1 WO 2005057019 A1 WO2005057019 A1 WO 2005057019A1 CH 2004000698 W CH2004000698 W CH 2004000698W WO 2005057019 A1 WO2005057019 A1 WO 2005057019A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling
liquid
compressor wheel
droplets
cooling liquid
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.)
Ceased
Application number
PCT/CH2004/000698
Other languages
German (de)
English (en)
Inventor
Ennio Codan
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.)
Accelleron Industries AG
Original Assignee
ABB Turbo Systems 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
Application filed by ABB Turbo Systems AG filed Critical ABB Turbo Systems AG
Priority to EP04797255A priority Critical patent/EP1692399A1/fr
Publication of WO2005057019A1 publication Critical patent/WO2005057019A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/705—Adding liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/5846—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling by injection

Definitions

  • the invention relates to the field of exhaust gas powered turbochargers. It relates to a method for cooling the compressor impeller.
  • Cooling with a gas is associated with less effort, because the gaseous cooling medium only has to be directed at the component to be cooled and flow around it. Often the gas is not recovered, i.e. no complex circuit and no heat exchanger are necessary. However, the cooling effect is limited.
  • the invention has for its object to provide an efficient method for cooling the compressor wheel of an exhaust gas turbocharger.
  • a cooling liquid is applied to the surface of the rotating compressor wheel that comes into contact with the gaseous medium to be compressed.
  • the coolant evaporates at least partially due to the high temperatures of the compressor wheel.
  • the temperature of the coolant drops and the cooled liquid thus has a cooling effect on the compressor wheel.
  • the cooling liquid is advantageously applied to the surface of the compressor wheel by supplying the cooling liquid to the gaseous medium upstream of the compressor wheel.
  • the figure shows schematically the cooling according to the invention on a compressor wheel. Way of carrying out the invention
  • An exhaust gas turbocharger mainly consists of a compressor and an exhaust gas turbine.
  • the compressor mainly comprises a housing and a compressor wheel arranged rotatably on a shaft in the housing.
  • the housing surrounds an inflow channel, through which the air, as the medium to be compressed, is guided to the compressor wheel.
  • the air is compressed by blades on the compressor wheel and then fed to a fuel engine through an outflow channel.
  • an evaporable cooling liquid is added to the medium to be compressed upstream of the compressor wheel, that is to say before the flow reaches the compressor wheel and is consequently still not compressed and has a correspondingly low temperature.
  • the cooling liquid is water or a water mixture.
  • the cooling liquid is advantageously injected into the flow channel as a mist from many very fine droplets by means of at least one nozzle.
  • the droplets advantageously have a diameter of less than 20 micrometers, with special nozzles even droplets with a diameter of less than 3 micrometers can be produced. The finer the droplets, the better the vaporizability. Shortly after the injection, due to the high friction heat mixing with the strong flow, the droplets partially evaporate, which lowers the temperature of the sprayed liquid mist.
  • the compressor wheel must compress the combustion air for the engine as high as possible. Although the air is heated by the compression, the static temperature in the compressor channels is not particularly high due to the fast main flow in the compressor channels. However, heat flows which is formed by the deceleration and the intense friction on the back of the compressor wheel, from the back through the material of the compressor wheel and is released into the main flow via the surface.
  • the droplets 21 come close to or against the wall of the compressor wheel 1, they are braked in the boundary layer (a) and can form a thin film 22.
  • This film from the injected coolant absorbs heat on the one hand from the hot compressor wheel (e) and on the other hand due to friction from the main flow 3, since the speed difference between the main flow and the area of the film is much higher (b). Because of this heat absorption, at least a part of the film 23 is removed in gaseous form in the flow 3 by evaporation (c). The unevaporated part of the liquid film 24 is released into the flow again by the large, centrifugal forces (d). The evaporation has a cooling effect on the film and on the surface of the compressor wheel.
  • the surface temperature is in the range of the so-called "wet bulb” temperature, i.e. the temperature that a moistened thermometer measures in the flow and which is lower than the temperature of the flow.
  • the method according to the invention is extremely efficient.
  • the use of the cooling method according to the invention is particularly interesting for compressors of turbochargers, since the compressor wheel is very difficult to cool with other methods.
  • cooling the main flow improves compressor efficiency and water vapor reduces the NOx emissions of the internal combustion engine connected to the turbocharger.
  • the compressor wheels of ordinary turbochargers are made of aluminum for economic reasons.
  • the creep rupture strength of the material decreases very strongly with the temperature, which is the limit of use of aluminum compressors today limited to pressure ratios of about 5. If water is injected into the air flow shortly before the wheel enters, a significant reduction in the material temperature can be achieved, which allows pressure ratios up to 6 or 7 to be reached without having to switch to materials that are sometimes more expensive, such as titanium.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Supercharger (AREA)

Abstract

Un liquide de refroidissement (21) est appliqué sur la surface de la roue de compresseur en rotation (1), venant au contact du milieu gazeux à compresser. Le liquide de refroidissement s'évapore (23) au moins partiellement en raison des températures élevées de la roue de compresseur. La température du liquide de refroidissement (22) s'abaisse et le liquide refroidi exerce alors un effet de refroidissement sur la roue de compresseur. L'ajout de petites quantités de liquide permet d'augmenter déjà sensiblement le coefficient de transfert de chaleur ( alpha ) entre la roue de compresseur et le flux.
PCT/CH2004/000698 2003-12-09 2004-11-19 Procede de refroidissement Ceased WO2005057019A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04797255A EP1692399A1 (fr) 2003-12-09 2004-11-19 Procede de refroidissement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003157711 DE10357711A1 (de) 2003-12-09 2003-12-09 Kühlungsverfahren
DE10357711.4 2003-12-09

Publications (1)

Publication Number Publication Date
WO2005057019A1 true WO2005057019A1 (fr) 2005-06-23

Family

ID=34672546

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2004/000698 Ceased WO2005057019A1 (fr) 2003-12-09 2004-11-19 Procede de refroidissement

Country Status (3)

Country Link
EP (1) EP1692399A1 (fr)
DE (1) DE10357711A1 (fr)
WO (1) WO2005057019A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2415469A (en) * 2004-06-09 2005-12-28 Man B & W Diesel Ag Turbocharger compressor cooling

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6453659B1 (en) * 1998-06-24 2002-09-24 N. V. Kema Device for compressing a gaseous medium and systems comprising such device
WO2003071113A1 (fr) * 2002-02-19 2003-08-28 Alstom Technology Ltd Turbocompresseur et procede pour faire fonctionner un tel turbocompresseur
US20030163982A1 (en) * 1997-04-22 2003-09-04 Hitachi, Ltd. Gas turbine installation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB705387A (en) * 1951-02-15 1954-03-10 Power Jets Res & Dev Ltd Improvements relating to radial-flow turbine or centrifugal compressors
DE1056426B (de) * 1951-05-16 1959-04-30 Power Jets Res & Dev Ltd Kuehleinrichtung an Gasturbinenanlagen
JPH03130503A (ja) * 1989-10-13 1991-06-04 Jinichi Nishiwaki ガスタービン高温部の水冷却方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030163982A1 (en) * 1997-04-22 2003-09-04 Hitachi, Ltd. Gas turbine installation
US6453659B1 (en) * 1998-06-24 2002-09-24 N. V. Kema Device for compressing a gaseous medium and systems comprising such device
WO2003071113A1 (fr) * 2002-02-19 2003-08-28 Alstom Technology Ltd Turbocompresseur et procede pour faire fonctionner un tel turbocompresseur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2415469A (en) * 2004-06-09 2005-12-28 Man B & W Diesel Ag Turbocharger compressor cooling
GB2415469B (en) * 2004-06-09 2009-01-28 Man B & W Diesel Ag Turbocharger and method of operation

Also Published As

Publication number Publication date
EP1692399A1 (fr) 2006-08-23
DE10357711A1 (de) 2005-07-14

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