DE102006038060A1 - Blade for turbo machine, comprises current stumbling element, where current is applied along prospective detachment position transversely to required number of current stumbling elements - Google Patents

Blade for turbo machine, comprises current stumbling element, where current is applied along prospective detachment position transversely to required number of current stumbling elements Download PDF

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Publication number
DE102006038060A1
DE102006038060A1 DE200610038060 DE102006038060A DE102006038060A1 DE 102006038060 A1 DE102006038060 A1 DE 102006038060A1 DE 200610038060 DE200610038060 DE 200610038060 DE 102006038060 A DE102006038060 A DE 102006038060A DE 102006038060 A1 DE102006038060 A1 DE 102006038060A1
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Prior art keywords
current
stumbling
elements
blade
flow
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DE200610038060
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German (de)
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Otto Hoffer
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/141—Shape, i.e. outer, aerodynamic form
    • F01D5/145—Means for influencing boundary layers or secondary circulations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • F05D2230/237—Brazing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/30—Manufacture with deposition of material
    • F05D2230/31—Layer deposition
    • F05D2230/311—Layer deposition by torch or flame spraying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/12—Fluid guiding means, e.g. vanes
    • F05D2240/127—Vortex generators, turbulators, or the like, for mixing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/10—Two-dimensional
    • F05D2250/11—Two-dimensional triangular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/10—Two-dimensional
    • F05D2250/12—Two-dimensional rectangular

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The blade comprises a current stumbling element, where current is applied along the prospective detachment position transversely to the required number of the current stumbling elements. The current is stoked up for laminar turbulent cover. The stumbling element is produced after the rough machining interrupts the finishing in the desired position. The stumbling elements are coated with a carbide containing hard metal by syringes, flame spraying or electrolytically.

Description

Die Erfindung betrifft eine Lauf- und Leitschaufel für Turbomaschinen, dadurch gekennzeichnet, dass zwecks Vermeidung der Strömungsablösung an der voraussichtlichen Ablösestelle Stolperelemente quer zur Strömung angebracht werden, die die Aufgabe haben, die Strömung zwecks Vermeidung der Ablösung turbulent zu machen.The The invention relates to a rotor and vane for turbomachinery, characterized that in order to avoid flow separation the expected detachment point Tripping elements across the flow which have the task of directing the flow in order to Avoidance of detachment to make turbulent.

Die ideale Umströmung einer Turbomaschinenschaufel ist laminar, da sie ein Minimum an Reibungserlusten verursacht.The ideal flow around A turbomachinery bucket is laminar, as it is a minimum Causes friction losses.

Häufig kommt es jedoch, bevor ein Umschlag laminar-turbulent erfolgt ist, zur Strömungsablösung.Often comes However, before an envelope is laminar-turbulent, the Flow separation.

Die Folge ist ein bedeutender Leistungsverlust der ganzen Maschine. Diese Gefahr besteht insbesondere im Teillast-Bereich, da dort der Anströmwinkel bedeutend von dem berechneten Anströminkel abweicht.The Result is a significant loss of performance of the whole machine. This danger exists especially in the partial load range, since there the angle of attack significantly deviates from the calculated flow angle.

Die Strömungsablösung kann vermieden werden indem man an der voraussichtlichen Ablösestelle ein Stolperelement anbringt, das die Strömung bevor es zu einer Ablösung kommt, zum Umschlag laminar-turbulent anfacht, 1.The flow separation can be avoided by attaching a trip element at the prospective detachment point, which causes the flow to become laminar-turbulent for the transfer before it comes to a separation, 1 ,

Es ist aus der allgemeinen Luftfahrt bekannt, an den Oberflächen kleine senkrechte Blechstücke schräg zur Strömung, sog. Turbulatoren anzubringen, die die Strömung zum Umschlag anfachen. Diese Methode ist für Turbomaschinenschaufeln nicht praktikabel.It is known from general aviation, on the surfaces small vertical pieces of sheet metal oblique to the flow, so-called To install turbulators, which fan the flow to the envelope. This method is for Turbomachinery blades not practical.

Daher liegt der Erfindung die Aufgabe zugrunde, eine Schaufel für Turbomaschinen derart vorzugeben, dass eine laminare Ablösung vermieden werden kann.Therefore The invention is based on the object, a blade for turbomachinery to specify such that a laminar detachment can be avoided.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass man an der voraussichtlichen Ablösestelle quer zur Strömung eine Stolperkante oder andere Stolperelemente anbringt, die die Strömung zum Umschlag laminar-turbulent anfachen.According to the invention solved the task by that at the prospective separation point across the flow one Stumbling edge or other trip elements attaches, which the flow to Fold envelope laminar-turbulent.

Die laminare Ablösung und die voraussichtliche Ablösestelle x als Entfernung von der Vorderkante des Profils können heute mit Hilfe einer Grenzschichtrechnung zuversichtlich vorausgesagt werden. Für die Grenzschichtdicke und damit die Mindesthöhe des Stolperelements δ kann man als eine erste Abschätzung wie folgt angeben:

Figure 00010001
The laminar detachment and the probable release point x as distance from the leading edge of the profile can today be confidently predicted with the help of a boundary layer calculation. For the boundary layer thickness and thus the minimum height of the tripping element δ, one can specify as a first estimate as follows:
Figure 00010001

Hier ist v die kinematische Zähigkeit des Strömungsmediums und W die Anströmgeschwindigkeit. Für Luft bei 20 °C, einer Anströmgeschwindigkeit von W = 100 m/s und einer Lauflänge x = 0.05 m erhält man z. B.: δ = 0,00041 m = 0,41 mmHere v is the kinematic viscosity of the flow medium and W is the flow velocity. For air at 20 ° C, a flow velocity of W = 100 m / s and a run length x = 0.05 m one z. B: δ = 0.00041 m = 0.41 mm

An einigen Ausführungsbeispielen wird die Erfindung erläutert:
In der 2 ist eine erste Ausführungsmöglichkeit eines Stolperelements zu sehen. Hier wird nach der Grobbearbeitung die anschliessende Feinbearbeitung an der gewünschten Stelle unterbrochen, sodass sich ein Stolperelement gemäss 2 ergibt..In some embodiments, the invention will be explained:
In the 2 is a first embodiment of a trip device to see. Here, after the roughing, the subsequent fine machining is interrupted at the desired location, so that a tripping element according to 2 results ..

Hier bedeutet die dünne Linie die Profilkontur nach der Grob- und vor der Feinbearbeitung während die dicke Linie die fertige Profilkontur ist. δ ist die erforderliche Höhe des Stolperelements.Here means the thin one Line the profile contour after coarse and before finishing while the thick line is the finished profile contour. δ is the required height of the trip element.

Eine zweite Ausführungsmöglichkeit ist in der 3 zu sehen. Hier wird nach der Feinbearbeitung ein Stolperelement aus Metall, gewöhnlich ein karbidhaltiges Hartmetall durch Spritzen oder Flammspritzen in der erforderlichen Länge quer zur Strömung aufgetragen. Eine elektrolytische Auftragung ist auch möglich.A second embodiment is in the 3 to see. Here, after the fine machining, a tripping element made of metal, usually a carbide-containing cemented carbide, is applied by spraying or flame spraying in the required length transversely to the flow. An electrolytic application is also possible.

Schliesslich kann man vorgefertigte Stolperelemente an der gewünschten Stelle durch Löten befestigen, 4.Finally, you can fix prefabricated tripping elements at the desired location by soldering, 4 ,

Die beschriebenen Stolperelemente müssen sich nicht entlang des ganzen Ablösegebietes erstrecken. Es genügt häufig, einige wenige Stolperelemente entlang der Ablösestelle anzubringen, die in der Draufsicht eine einfache geometrische Form, wie Dreieck mit der Spitze gegen die Strömungsrichtung zeigend (a), ein Rechteck (b, c) oder Kreis (d) aufweisen, 5.The tripping elements described do not have to extend along the entire detachment area. It is often sufficient to place a few stumbling elements along the detachment point, which in plan view have a simple geometric shape, such as a triangle with the tip facing the flow direction (a), a rectangle (b, c) or circle (d). 5 ,

Claims (5)

Schaufel für Turbomaschinen dadurch gekennzeichnet, dass zur Vermeidung einer Ablösung der Strömug entlang der voraussichtlichen Ablösestelle quer zur Strömung Stolperelemente in der erforderlichen Zahl angebracht werden, die die Strömung zum Umschlag laminar-turbulent anfachen und dadurch eine Ablösung vermieden wird.Scoop for turbomachinery, characterized in that to avoid a separation of the Strömug along the expected detachment point across the flow tripping elements are mounted in the required number, which fan the flow to the envelope laminar-turbulent and thereby a replacement is avoided. Schaufel für Turbomaschinen nach Anspruch 1 dadurch gekennzeichnet, dass das Stolperelement erzeugt wird indem nach der Grobbearbeitung die Feinbearbeitung an der gewünschten Stelle unterbrochen wird (2).Shovel for turbomachinery according to claim 1, characterized in that the tripping element is produced by the fine machining is interrupted at the desired location after the roughing ( 2 ). Schaufel für Turbomaschinen nach Anspruch 1 dadurch gekennzeichnet, dass nach der Feinbearbeitung Stolperelemente vorzugsweise aus einem karbidhaltigen Hartmetall durch Spritzen, Flammspritzen oder elektrolytisch aufgetragen werden (3).Blade for turbomachinery according to claim 1, characterized in that after the fine machining tripping elements are preferably applied from a carbide-containing cemented carbide by spraying, flame spraying or electrolytic ( 3 ). Schaufel für Turbomaschinen nach Anspruch 1 dadurch gekennzeichnet, dass vorgefertigte Stolperelemente nach der Feinbearbeitung an der gewünschten Stelle aufgelötet oder aufgeklebt werden (4).Shovel for turbomachinery according to claim 1, characterized in that prefabricated tripping elements are soldered or glued after finishing at the desired location ( 4 ). Schaufel für Turbomaschinen nach einem der Ansprüche 1 bis 4 dadurch gekennzeichnet, dass das Stolperelement in der Draufsicht eine einfache geometrische Form, z. B. ein Dreieck mit der Spitze gegen die Strömungsrichtung zeigend (a), Rechteck (b, c) oder Kreis (d) aufweist (5).Blade for turbomachinery according to one of claims 1 to 4, characterized in that the tripping element in the plan view of a simple geometric shape, for. B. a triangle with the tip facing the flow direction pointing (a), rectangle (b, c) or circle (d) ( 5 ).
DE200610038060 2006-08-16 2006-08-16 Blade for turbo machine, comprises current stumbling element, where current is applied along prospective detachment position transversely to required number of current stumbling elements Withdrawn DE102006038060A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20110788A1 (en) * 2011-05-09 2012-11-10 Ansaldo Energia Spa GAS TURBINE SHOVEL
EP2672064A1 (en) * 2012-06-08 2013-12-11 General Electric Company Turbine engine and aerodynamic element of turbine engine
CN104314618A (en) * 2014-10-09 2015-01-28 中国科学院工程热物理研究所 Low-pressure turbine blade structure and method for reducing loss of blade

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20110788A1 (en) * 2011-05-09 2012-11-10 Ansaldo Energia Spa GAS TURBINE SHOVEL
EP2672064A1 (en) * 2012-06-08 2013-12-11 General Electric Company Turbine engine and aerodynamic element of turbine engine
CN103485846A (en) * 2012-06-08 2014-01-01 通用电气公司 Turbine engine and aerodynamic element thereof
US9488055B2 (en) 2012-06-08 2016-11-08 General Electric Company Turbine engine and aerodynamic element of turbine engine
CN103485846B (en) * 2012-06-08 2017-03-01 通用电气公司 Turbogenerator and the Pneumatic assembly of turbogenerator
CN104314618A (en) * 2014-10-09 2015-01-28 中国科学院工程热物理研究所 Low-pressure turbine blade structure and method for reducing loss of blade
CN104314618B (en) * 2014-10-09 2015-08-19 中国科学院工程热物理研究所 A kind of method of low-pressure turbine blade structure and reduction blade loss

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