EP1456505A1 - Thermally loaded component - Google Patents

Thermally loaded component

Info

Publication number
EP1456505A1
EP1456505A1 EP02779098A EP02779098A EP1456505A1 EP 1456505 A1 EP1456505 A1 EP 1456505A1 EP 02779098 A EP02779098 A EP 02779098A EP 02779098 A EP02779098 A EP 02779098A EP 1456505 A1 EP1456505 A1 EP 1456505A1
Authority
EP
European Patent Office
Prior art keywords
deflection
thermally loaded
loaded component
cooling
parts
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Withdrawn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
EP02779098A
Other languages
German (de)
French (fr)
Inventor
Kenneth Hall
Sacha Parneix
Remigi Tschuor
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.)
Ansaldo Energia IP UK Ltd
Original Assignee
Alstom Technology 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 Alstom Technology AG filed Critical Alstom Technology AG
Publication of EP1456505A1 publication Critical patent/EP1456505A1/en
Withdrawn legal-status Critical Current

Links

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
    • F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
    • F01D5/187—Convection cooling
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/49336—Blade making
    • Y10T29/49339—Hollow blade
    • Y10T29/49341—Hollow blade with cooling passage
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49989—Followed by cutting or removing material

Definitions

  • the invention is based on a thermally loaded component according to the preamble of the first claim.
  • blades are known in which cooling fluid is conducted from the trailing edge region of the blade to the leading edge region via cooling channels formed by partition walls and then blown out via openings in the blade head. In order to cool the trailing edge area of the bucket sufficiently, you blow air out of the rear edge of the blade. Deflection vanes are arranged in order to divert the cooling fluid into the cooling channels.
  • deflection blades are often arranged in the region of the deflection channels.
  • these deflection blades are very fragile and difficult to manufacture using the casting process, even with large components such as for large blades of stationary gas turbines.
  • tensions can form in the cast body because the inner, relatively small-sized parts and the outer parts have different cooling rates. In individual cases, these tensions can lead to cracks in the internal structures, which means that the cast part cannot be used. If the defects are not noticed, the cast part can break during use and e.g. with blades, additional blades and destroy the turbine.
  • the invention is based on the object of avoiding problems with previously known means for deflecting the cooling fluid in a thermally loaded component with at least one cooling channel of the type mentioned at the outset and nevertheless enabling efficient cooling.
  • the deflection device consists of two mutually spaced deflection parts over the height of the cooling channel.
  • the advantages of the invention can be seen, inter alia, in the fact that the function of the deflection device with respect to previously known deflection blades is not impaired by the inventive design of the deflection device.
  • the primary function of the deflection device the prevention of pressure losses and the avoidance of a separation of the cooling fluid flow after the deflection channel is further guaranteed.
  • the deflecting parts according to the invention are arranged in cooling ducts of blades of heat engines.
  • FIG. 1 shows a partial longitudinal section through a blade of a turbine.
  • FIG. 4 shows a cross section through a deflection device according to the invention
  • Fig. 5 shows a cross section through a further inventive
  • FIG. 1 shows a blade 10 of a turbomachine, consisting of a blade 1 and a blade root 11, with which the blade 10 can be mounted on a rotor or stator, not shown.
  • a platform 12 is usually arranged between the airfoil 1 and the airfoil 11 and shields the airfoil and thus the rotor or stator from the fluids flowing around the airfoil.
  • the airfoil 1 has a leading edge region 3, a trailing edge region 4, a suction-side wall 5 and a pressure-side wall 6 (see FIG. 3a), the suction-side and the pressure-side wall being connected to one another in the region of the leading edge 3 and the trailing edge 4, as a result of which a cavity 2 is formed.
  • the front edge region 3 is first acted upon by the fluids flowing around the airfoil 1.
  • the cavity 2 extends essentially in the radial direction through the blade 10 and serves as a cooling fluid passage for a cooling fluid 20.
  • essentially radially extending partition walls 8 are arranged in the cavity 2 in order to generate cooling channels 21.
  • These cooling channels 21 are connected by deflection channels 22, which are designed in such a way that the pressure loss during the deflection is minimal and the heat transfer is as homogeneous as possible in order to avoid local hot zones.
  • additional deflection devices such as deflection blades 9, are arranged in the region of the deflection channels 22.
  • deflecting blades 9 can be designed as desired according to FIGS. 2a, 2b and 2c, e.g. with regard to thickness along the blade, the radius of curvature etc. and must be adapted to the conditions in the deflection channel 22.
  • 3a, 3b and 4 show the deflection vane according to the invention consisting of a first deflection part 9a on the suction side and an opposite second deflection part 9b on the pressure side of the vane.
  • the deflection parts 9a and 9b are at a distance ⁇ from one another, which can be up to 30% of the height 23 of the cooling channel 21 at the location of the deflection parts.
  • the design of the deflecting parts 9a and 9b according to the invention does not impair the function of the deflecting device with respect to previously known deflecting blades.
  • the primary function of the deflection vane is the prevention of pressure losses and the avoidance of a separation of the cooling fluid flow 20 after the deflection channel 22.
  • the deflecting parts can be designed as desired, as shown in FIGS. 2a, 2b and 2c and described above for the deflecting vane.
  • the function of the deflection parts namely the prevention of pressure losses and the avoidance of separation of the cooling fluid flow 20 after the deflection channel 22, is maintained.
  • the distance ⁇ was achieved by arranging a weak point in the deflection vane due to a narrowing or notch 24 in the casting mold.
  • the deflection vane breaks into two parts after the casting process during cooling and the resulting shrinkage, and thus produces the two deflection parts 9a and 9b with the spacing ⁇ .
  • the distance ⁇ and its shape can be set by the design of the notch 24.
  • Such deflection parts can generally be arranged in curvatures of cooling channels of thermally loaded components in order to avoid the problems described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The invention relates to a thermally loaded component (1, 10) through which a cooling channel (21) extends, for the flow of a cooling liquid (20). At least one deviation device (9) is provided in the region of a bend (22) in the cooling channel, for channelling the flow of the cooling liquid (20). The deviation device (9) consists of two interspaced deviating parts (9a, 9b) which are arranged in the height (23) of the cooling channel (21).

Description

Thermisch belastetes Bauteil Thermally loaded component
Technisches GebietTechnical field
Die Erfindung geht aus von einem thermisch belasteten Bauteil nach dem Oberbegriff des ersten Anspruches.The invention is based on a thermally loaded component according to the preamble of the first claim.
Stand der TechnikState of the art
Eine Steigerung der Effizienz einer Wärmekraftmaschine, z.B. einer Gasturbine, ist direkt abhängig von einer Steigerung der Arbeitstemperatur der thermisch belasteten Bauteile und somit bei einer Gasturbine abhängig von der Verbrennungsgastemperatur der Brennkammer und der darauffolgenden Turbine. Trotz verbes- serter hochtemperaturbeständiger Werkstoffe muss auch die Kühltechnik verbessert werden, um die Werkstofftemperaturen beim Betrieb solcher thermisch belasteten Bauteile in einem sicheren Bereich zu halten. Dazu werden Kühlkanäle verwendet, welche z.B. aus dem Verdichter mit Kühlfluid gespiesen werden. Dabei wird versucht, einen möglichst grossen Kühleffekt bei möglichst kleinen Verlusten bezüglich der Leistung des Gesamtsystems zu erzielen. Dazu werden spezielle verbesserte Wäremübertragungstechniken wie z.B. Rippen in den Kühlkanälen verwendet.An increase in the efficiency of a heat engine, e.g. a gas turbine is directly dependent on an increase in the working temperature of the thermally loaded components and thus in a gas turbine it is dependent on the combustion gas temperature of the combustion chamber and the subsequent turbine. Despite the improved high-temperature resistant materials, the cooling technology must also be improved in order to keep the material temperatures in a safe area when operating such thermally stressed components. For this, cooling channels are used, which e.g. be fed from the compressor with cooling fluid. An attempt is made to achieve the greatest possible cooling effect with the smallest possible losses in terms of the performance of the overall system. For this purpose, special improved heat transfer technologies such as Ribs used in the cooling channels.
Aus der GB 2 165 315 sind Schaufeln bekannt, bei welchen Kühlfluid über durch Trennwände gebildete Kühlkanäle vom Hinterkantenbereich der Schaufel zum Vorderkantenbereich geleitet und dann über Öffnungen im Schaufelkopf ausgeblasen wird. Um den Hinterkantenbereich der Schaufel ausreichend zu kühlen, bläst man Luft aus der Hinterkante der Schaufel aus. Um das Kühlfluid in die Kühlkanäle umzuleiten sind Umlenkschaufeln angeordnet.From GB 2 165 315, blades are known in which cooling fluid is conducted from the trailing edge region of the blade to the leading edge region via cooling channels formed by partition walls and then blown out via openings in the blade head. In order to cool the trailing edge area of the bucket sufficiently, you blow air out of the rear edge of the blade. Deflection vanes are arranged in order to divert the cooling fluid into the cooling channels.
Allgemein werden in thermisch belasteten Bauteilen, z.B. Schaufeln von Turbinen, vielfach im wesentlichen parallel verlaufende Kühlkanäle verwendet, welche über Umlenkkanäle verbunden werden. Diese Umlenkkanäle sind so ausgestaltet, dass der Druckverlust bei der Umlenkung minimal und der Wärmeübergang möglichst homogen ist, um lokale heisse Zonen zu vermeiden. Um dies zu erreichen, werden vielfach Umlenkschaufeln im Bereich der Umlenkkanäle angeordnet. Diese Umlenkschaufeln sind jedoch sehr fragil und schwer im Gussverfahren herzustellen, selbst bei grossen Bauteilen wie z.B. bei grossen Schaufeln von stationären Gasturbinen. So können sich beispielsweise nach dem Gussvorgang beim Abkühlen des Gusskörpers Spannungen im Gusskörper bilden, weil die inneren, relativ geringe Dimensionen aufweisenden Teile und die äusseren Teile unter- schiedliche Abkühlungsraten aufweisen. Diese Spannungen können im Einzelfall dazu führen, dass es Risse in den inneren Strukturen gibt, wodurch das Gussteil nicht verwendet werden kann. Falls die Fehler nicht bemerkt werden, kann das Gussteil beim Gebrauch brechen und z.B. bei Schaufeln weitere Schaufeln und die Turbine zerstören.Generally, in thermally stressed components, e.g. Turbine blades, often cooling channels running essentially in parallel, which are connected via deflection channels. These deflection channels are designed in such a way that the pressure loss during the deflection is minimal and the heat transfer is as homogeneous as possible in order to avoid local hot zones. In order to achieve this, deflection blades are often arranged in the region of the deflection channels. However, these deflection blades are very fragile and difficult to manufacture using the casting process, even with large components such as for large blades of stationary gas turbines. For example, after the casting process, when the cast body cools, tensions can form in the cast body because the inner, relatively small-sized parts and the outer parts have different cooling rates. In individual cases, these tensions can lead to cracks in the internal structures, which means that the cast part cannot be used. If the defects are not noticed, the cast part can break during use and e.g. with blades, additional blades and destroy the turbine.
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt die Aufgabe zugrunde, bei einem thermisch belasteten Bauteil mit mindestens einem Kühlkanal der eingangs genannten Art Probleme mit bisher bekannten Mitteln zum Umlenken des Kühlfluids zu vermeiden und trotzdem eine effiziente Kühlung zu ermöglichen.The invention is based on the object of avoiding problems with previously known means for deflecting the cooling fluid in a thermally loaded component with at least one cooling channel of the type mentioned at the outset and nevertheless enabling efficient cooling.
Erfindungsgemäss wird dies durch die Merkmale des ersten Anspruches erreicht. Kern der Erfindung ist es also, dass die Umlenkeinrichtung über die Höhe des Kühlkanals aus zwei zueinander beabstandeten Umlenkteilen besteht.According to the invention, this is achieved by the features of the first claim. The essence of the invention is therefore that the deflection device consists of two mutually spaced deflection parts over the height of the cooling channel.
Die Vorteile der Erfindung sind unter anderem darin zu sehen, dass durch die er- findungsgemässe Ausgestaltung der Umlenkeinrichtung die Funktion der Umlenkeinrichtung bezüglich bisher bekannten Umlenkschaufeln nicht beeinträchtigt wird. Die primäre Funktion der Umlenkeinrichtung, die Verhinderung von Druckverlusten und die Vermeidung einer Separation des Kühlfluidstromes nach dem Umlenkkanal ist weiter garantiert. Durch die Aufteilung der Umlenkeinrichtung in zwei zueinander beabstandete Umlenkteile werden Spannungen und Risse, welche bei bisher bekannten Schaufeln festgestellt wurden, vermieden. Weiter wurde die Lebensdauer der Schaufeln bezüglich der thermomechanischen Ermüdung (TM F) verbessert.The advantages of the invention can be seen, inter alia, in the fact that the function of the deflection device with respect to previously known deflection blades is not impaired by the inventive design of the deflection device. The primary function of the deflection device, the prevention of pressure losses and the avoidance of a separation of the cooling fluid flow after the deflection channel is further guaranteed. By dividing the deflecting device into two mutually spaced deflecting parts, stresses and cracks, which were found in previously known blades, are avoided. Furthermore, the service life of the blades with regard to thermomechanical fatigue (TM F) has been improved.
Es ist besonders zweckmässig, wenn die erfindungsgemässen Umlenkteile in Kühlkanälen von Schaufeln von Wärmekraftmaschinen angeordnet werden.It is particularly expedient if the deflecting parts according to the invention are arranged in cooling ducts of blades of heat engines.
Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Un- teransprüchen.Further advantageous refinements of the invention result from the subclaims.
Kurze Beschreibung der ZeichnungBrief description of the drawing
Im folgenden werden anhand der Zeichnungen Ausführungsbeispiele der Erfindung näher erläutert. Alle für das unmittelbare Verständnis der Erfindung unwesentlichen Merkmale sind fortgelassen worden. Gleiche Elemente sind in den ver- schiedenen Figuren mit den gleichen Bezugszeichen versehen. Die Strömungsrichtung der Medien ist mit Pfeilen angegeben. Es zeigen:Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. All features which are not essential for the immediate understanding of the invention have been omitted. Identical elements are provided with the same reference symbols in the various figures. The direction of flow of the media is indicated by arrows. Show it:
Fig. 1 einen Teillängsschnitt durch eine Schaufel einer Turbine;1 shows a partial longitudinal section through a blade of a turbine.
Fig. 2a, 2b und 2c verschiedene Ausgestaltungsformen einer Umlenkeinrichtung;2a, 2b and 2c different embodiments of a deflection device;
Fig. 3a und 3b eine erfindungsgemässe Umlenkeinrichtung;3a and 3b a deflection device according to the invention;
Fig. 4 einen Querschnitt durch eine erfindungsgemässe Umlenkeinrichtung;4 shows a cross section through a deflection device according to the invention;
Fig. 5 einen Querschnitt durch eine weitere erfindungsgemässeFig. 5 shows a cross section through a further inventive
Umlenkeinrichtung.Deflection.
Es sind nur die für das Verständnis der Erfindung wesentlichen Elemente gezeigt.Only the elements essential for understanding the invention are shown.
Weg zur Ausführung der ErfindungWay of carrying out the invention
In Fig. 1 ist eine Schaufel 10 einer Strömungsmaschine dargestellt, bestehend aus einem Schaufelblatt 1 und einem Schaufelfuss 11 , mit dem die Schaufel 10 auf einem nicht dargestellten Rotor oder Stator montiert werden kann. Zwischen Schaufelblatt 1 und Schaufelfuss 11 ist üblicherweise eine Plattform 12 angeordnet, welche den Schaufelfuss und damit den Rotor oder Stator von den das Schaufelblatt umströmenden Fluiden abschirmt. Das Schaufelblatt 1 weist einen Vorderkantenbereich 3, einen Hinterkantenbereich 4, eine saugseitige Wand 5 und eine druckseitige Wand 6 auf (siehe Fig. 3a), wobei die saugseitige und die druckseitige Wand im Bereich der Vorderkante 3 und der Hinterkante 4 miteinander verbunden sind, wodurch ein Hohlraum 2 gebildet wird. Der Vorderkantenbereich 3 wird jeweils von den das Schaufelblatt 1 umströmenden Fluiden zuerst be- aufschlagt. Der Hohlraum 2 verläuft im wesentlichen in radialer Richtung durch die Schaufel 10 und dient als Kühlfluiddurchlass für ein Kühlfluid 20. Zur besseren Kühlung der Schaufel sind im Hohlraum 2 im wesentlichen radial verlaufende Trennwände 8 angeordnet, um Kühlkanäle 21 zu erzeugen. Diese Kühlkanäle 21 sind durch Umlenkkanäle 22 verbunden, welche so ausgestaltet sind, dass der Druckverlust bei der Umlenkung minimal und der Wärmeübergang möglichst homogen ist, um lokale heisse Zonen zu vermeiden. Um diese integrale Erfassung der Strömung des Kühlfluides zu erreichen, werden zusätzliche Umlenkeinrichtungen wie z.B. Umlenkschaufeln 9 im Bereich der Umlenkkanäle 22 angeordnet.1 shows a blade 10 of a turbomachine, consisting of a blade 1 and a blade root 11, with which the blade 10 can be mounted on a rotor or stator, not shown. A platform 12 is usually arranged between the airfoil 1 and the airfoil 11 and shields the airfoil and thus the rotor or stator from the fluids flowing around the airfoil. The airfoil 1 has a leading edge region 3, a trailing edge region 4, a suction-side wall 5 and a pressure-side wall 6 (see FIG. 3a), the suction-side and the pressure-side wall being connected to one another in the region of the leading edge 3 and the trailing edge 4, as a result of which a cavity 2 is formed. The front edge region 3 is first acted upon by the fluids flowing around the airfoil 1. The cavity 2 extends essentially in the radial direction through the blade 10 and serves as a cooling fluid passage for a cooling fluid 20. For better cooling of the blade, essentially radially extending partition walls 8 are arranged in the cavity 2 in order to generate cooling channels 21. These cooling channels 21 are connected by deflection channels 22, which are designed in such a way that the pressure loss during the deflection is minimal and the heat transfer is as homogeneous as possible in order to avoid local hot zones. In order to achieve this integral detection of the flow of the cooling fluid, additional deflection devices, such as deflection blades 9, are arranged in the region of the deflection channels 22.
Diese Umlenkschaufeln 9 können gemäss Fig. 2a, 2b und 2c beliebig ausgestaltet werden, z.B. bezüglich Dicke entlang der Schaufel, des Krümmungsradius usw. und müssen jeweils den Bedingungen im Umlenkkanal 22 angepasst werden.These deflecting blades 9 can be designed as desired according to FIGS. 2a, 2b and 2c, e.g. with regard to thickness along the blade, the radius of curvature etc. and must be adapted to the conditions in the deflection channel 22.
Fig. 3a, 3b und 4 zeigen die erfindungsgemässe Umlenkschaufel bestehend aus einem ersten Umlenkteil 9a an der Saugseite und einem ihm gegenüberliegenden zweiten Umlenkteil 9b an der Druckseite der Schaufel. Die Umlenkteile 9a und 9b weisen einen Abstand δ voneinander auf, welcher bis zu 30% der Höhe 23 des Kühlkanales 21 an der Stelle der Umlenkteile betragen kann. Durch die erfindungsgemässe Ausgestaltung der Umlenkteile 9a und 9b wird die Funktion der Umlenkeinrichtung bezüglich bisher bekannten Umlenkschaufeln nicht beeinträchtigt. Die primäre Funktion der Umlenkschaufel ist die Verhinderung von Druckverlusten und die Vermeidung einer Separation des Kühlfluidstromes 20 nach dem Umlenkkanal 22.3a, 3b and 4 show the deflection vane according to the invention consisting of a first deflection part 9a on the suction side and an opposite second deflection part 9b on the pressure side of the vane. The deflection parts 9a and 9b are at a distance δ from one another, which can be up to 30% of the height 23 of the cooling channel 21 at the location of the deflection parts. The design of the deflecting parts 9a and 9b according to the invention does not impair the function of the deflecting device with respect to previously known deflecting blades. The primary function of the deflection vane is the prevention of pressure losses and the avoidance of a separation of the cooling fluid flow 20 after the deflection channel 22.
Durch Versuche an erfindungsgemässen Schaufeln wurde weiter festgestellt, dass durch die Aufteilung der bisher bekannten Umlenkeinrichtungen in zwei Umlenkteile Spannungen und Risse, welche bei bisher bekannten Schaufeln festgestellt wurden, vermieden werden. Weiter zeigte sich, dass die Lebensdauer der Schaufeln bezüglich der thermomechanischen Ermüdung (TMF) verbessert wur- de.Experiments on blades according to the invention further found that by dividing the previously known deflection devices into two deflection parts, stresses and cracks, which were found in previously known blades, are avoided. It was also shown that the service life of the blades was improved with regard to thermomechanical fatigue (TMF).
Die Umlenkteile können dabei beliebig ausgestaltet werden, wie dies in Fig. 2a, 2b und 2c gezeigt und oben für die Umlenkschaufel beschrieben wurde. Darüber hin- aus ist die Ausgestaltung des Abstand δ der beiden Umlenkteile in Strömungsrichtung des Kühlfluides variabel sowie die Ausgestaltung beliebig, wobei jedoch beachtet werden muss, dass die Funktion der Umlenkteile, nämlich die Verhinderung von Druckverlusten und die Vermeidung einer Separation des Kühlfluidstro- mes 20 nach dem Umlenkkanal 22, beibehalten wird.The deflecting parts can be designed as desired, as shown in FIGS. 2a, 2b and 2c and described above for the deflecting vane. In addition From the configuration of the distance δ between the two deflection parts in the flow direction of the cooling fluid is variable and the configuration is arbitrary, but it must be noted that the function of the deflection parts, namely the prevention of pressure losses and the avoidance of separation of the cooling fluid flow 20 after the deflection channel 22, is maintained.
Fig. 5 zeigt eine weitere erfindungsgemässe Ausgestaltung von zwei Umlenkteilen 9a und 9b. Hier wurde der Abstand δ erzielt, indem durch eine in der Gussform vorhandene Verengung oder Kerbe 24 eine Schwachstelle in der Umlenkschaufel angeordnet wurde. Durch diese Kerbe 24 bricht die Umlenkschaufel nach dem Gussprozess beim Abkühlen und dem dadurch bedingten Schrumpfen in zwei Teile und erzeugt so die beiden Umlenkteile 9a und 9b mit dem Abstand δ. Durch die Ausgestaltung der Kerbe 24 kann der Abstand δ und dessen Form eingestellt werden.5 shows a further embodiment according to the invention of two deflection parts 9a and 9b. Here, the distance δ was achieved by arranging a weak point in the deflection vane due to a narrowing or notch 24 in the casting mold. By means of this notch 24, the deflection vane breaks into two parts after the casting process during cooling and the resulting shrinkage, and thus produces the two deflection parts 9a and 9b with the spacing δ. The distance δ and its shape can be set by the design of the notch 24.
Selbstverständlich ist die Erfindung nicht auf das gezeigte und beschriebene Ausführungsbeispiel beschränkt. Solche Umlenkteile können allgemein in Krümmungen von Kühlkanälen von thermisch belasteten Bauteilen angeordnet werden, um die oben beschriebenen Probleme zu vermeiden. Of course, the invention is not limited to the exemplary embodiment shown and described. Such deflection parts can generally be arranged in curvatures of cooling channels of thermally loaded components in order to avoid the problems described above.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Schaufelblatt1 airfoil
2 Hohlraum2 cavity
3 Vorderkantenbereich3 leading edge area
4 Hinterkantenbereich4 trailing edge area
5 saugseitige Wand5 suction-side wall
6 druckseitige Wand6 pressure side wall
8 Trennwand8 partition
9 Umlenkeinrichtung / Umlenkschaufel9 deflection device / deflection vane
9a erstes Umlenkteil Saugseite9a first deflection part suction side
9b zweites Umlenkteil Druckseite9b second deflection part pressure side
10 Schaufel10 shovel
11 Schaufelfuss11 blade root
12 Plattform12 platform
20 Kühlfluid20 cooling fluid
21 Kühlkanal21 cooling channel
22 Umlenkkanal22 deflection channel
23 Höhe Kühlkanal23 Cooling channel height
24 Kerbe δ Abstand 24 notch δ distance

Claims

Patentansprüche claims
1. Thermisch belastetes Bauteil (1 , 10), das mit mindestens einem Kühlkanal (21) für die Strömung eines Kühlfluids (20) durchzogen ist, wobei im Bereich einer Krümmung (22) innerhalb des Kühlkanals (21) mindestens eine Umlenkeinrichtung (9) für die integrale Erfassung der Strömung des Kühl- fluids (20) vorgesehen ist, dadurch gekennzeichnet, dass die Umlenkeinrichtung (9) über die Höhe (23) des Kühlkanals (21) aus zwei zueinander beabstandeten Umlenkteilen (9a, 9b) besteht.1. A thermally stressed component (1, 10) which has at least one cooling channel (21) for the flow of a cooling fluid (20), with at least one deflection device (9) in the area of a bend (22) within the cooling channel (21) is provided for the integral detection of the flow of the cooling fluid (20), characterized in that the deflection device (9) consists of two mutually spaced deflection parts (9a, 9b) over the height (23) of the cooling channel (21).
2. Thermisch belastetes Bauteil (1 , 10) nach Anspruch 1 , dadurch gekennzeichnet, dass die zwei zueinander beabstandeten Umlenkteile (9a, 9b) fluchtend angeordnet sind.2. Thermally loaded component (1, 10) according to claim 1, characterized in that the two mutually spaced deflecting parts (9a, 9b) are arranged in alignment.
3. Thermisch belastetes Bauteil (1 , 10) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Abstand (δ) der zwei zueinander beabstandeten Umlenkteile (9a, 9b) bis zu 30% der Höhe des Kühlkanales (23) im Bereich der Umlenkteile beträgt.3. Thermally loaded component (1, 10) according to claim 1 or 2, characterized in that a distance (δ) of the two mutually spaced deflecting parts (9a, 9b) up to 30% of the height of the cooling channel (23) in the region of the deflecting parts is.
4. Thermisch belastetes Bauteil (1 , 10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zwei zueinander beabstandeten Umlenkteile (9a, 9b) und der Abstand (δ) zwischen den Umlenkteilen eine beliebige Form aufweisen können. 4. Thermally loaded component (1, 10) according to one of the preceding claims, characterized in that the two mutually spaced deflecting parts (9a, 9b) and the distance (δ) between the deflecting parts can have any shape.
5. Thermisch belastetes Bauteil (1 , 10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Umlenkteile (9a, 9b) und der Abstand (δ) zwischen den Umlenkteilen durch in der Gussform vorgesehene Mittel (24) im Gussprozess herstellbar sind.5. Thermally loaded component (1, 10) according to one of the preceding claims, characterized in that the deflecting parts (9a, 9b) and the distance (δ) between the deflecting parts can be produced in the casting process by means (24) provided in the casting mold.
6. Thermisch belastetes Bauteil (1 , 10) nach Anspruch 5, dadurch gekennzeichnet, dass das in der Gussform vorgesehene Mittel (24) eine Verengung im Querschnitt der Umlenkeinrichtung (9) ist.6. Thermally loaded component (1, 10) according to claim 5, characterized in that the means (24) provided in the casting mold is a constriction in the cross section of the deflection device (9).
7. Thermisch belastetes Bauteil (1 , 10) nach einem der vorhergehenden An- sprüche, dadurch gekennzeichnet, dass das thermisch belastete Bauteil in einer Wärmekraftmaschine angeordnet ist.7. Thermally loaded component (1, 10) according to one of the preceding claims, characterized in that the thermally loaded component is arranged in a heat engine.
8. Thermisch belastetes Bauteil (1 , 10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das thermisch belastete Bauteil die Schaufel (10) einer Wärmekraftmaschine ist.8. thermally loaded component (1, 10) according to one of the preceding claims, characterized in that the thermally loaded component is the blade (10) of a heat engine.
Thermisch belastetes Bauteil (1 , 10) nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die Wärmekraftmaschine eine Gasturbine ist. Thermally loaded component (1, 10) according to claim 7 or 8, characterized in that the heat engine is a gas turbine.
EP02779098A 2001-12-10 2002-12-04 Thermally loaded component Withdrawn EP1456505A1 (en)

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CH22512001 2001-12-10
CH225101 2001-12-10
PCT/CH2002/000661 WO2003054356A1 (en) 2001-12-10 2002-12-04 Thermally loaded component

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WO2003054356A1 (en) 2003-07-03
US7137784B2 (en) 2006-11-21
US20050042096A1 (en) 2005-02-24

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