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DE908975C - Internally cooled turbine blade - Google Patents

Internally cooled turbine blade

Info

Publication number
DE908975C
DE908975C DEB7951D DEB0007951D DE908975C DE 908975 C DE908975 C DE 908975C DE B7951 D DEB7951 D DE B7951D DE B0007951 D DEB0007951 D DE B0007951D DE 908975 C DE908975 C DE 908975C
Authority
DE
Germany
Prior art keywords
coolant
turbine blade
internally cooled
cooled turbine
absolute
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
DEB7951D
Other languages
German (de)
Inventor
Dipl-Ing Hermann Hagen
Dipl-Ing Dr Hans-Geo Muenzberg
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DEB7951D priority Critical patent/DE908975C/en
Application granted granted Critical
Publication of DE908975C publication Critical patent/DE908975C/en
Expired 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
    • 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

Landscapes

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

Description

Die Erfindung betrifft eine Turbinenschaufel, bei der das Kühlmittel längs der radialen Ausdehnung der Schaufel durch eine Anzahl übereinander angeordneter Kanäle in Strömungsrichtung des Arbeitsmittels austritt, und zwar betrifft sie die Größe der austretenden Kühlmittelgeschwindigkeit.The invention relates to a turbine blade in which the coolant is along the radial extension of the blade through a number of channels arranged one above the other in the flow direction of the working medium exits, namely it relates to the size of the exiting coolant velocity.

Erfindungsgemäß wurde erkannt, daß die durch das Ausströmen des Kühlmittels an der Schaufelkante entstehenden Strömungsverluste auf ein Minimum beschränkt werden und die dem ausströmenden Kühlmittel innewohnende Geschwindigkeitsenergie weitgehend ausgenutzt wird, wenn die Größe der Austrittsgeschwindigkeit des Kühlmittels derart bemessen wird, daß sich bei der vektoriellen Addition von Austrittsgeschwindigkeit und Umfangsgeschwindigkeit eine Resultierende für die Absölutgeschwindigkeit ergibt, deren Richtung und Größe mit dem Vektor der Absolutgeschwindigkeit des Arbeitsmittels an der Schaufelaustrittskante zumindest annähernd übereinstimmt.According to the invention it was recognized that the by the outflow of the coolant at the blade edge resulting flow losses are kept to a minimum and those of the outflowing Coolant inherent speed energy is largely exploited when the Size of the exit velocity of the coolant is dimensioned such that the vectorial Addition of exit speed and peripheral speed results in a result for the Absolute velocity results in their direction and magnitude with the vector of the absolute velocity of the working fluid at the blade trailing edge at least approximately coincides.

Unter Zugrundelegung der erforderlichen Kühlmittelmenge werden die Querschnitte der Kanäle am Austritt der Schaufelkante bemessen. Ergänzend sei noch darauf hingewiesen, daß sich die Anzahl dieser Kanäle bis auf einen vermindern läßt.The cross-sections of the ducts are calculated based on the required amount of coolant measured at the outlet of the blade edge. In addition, it should be noted that the The number of these channels can be reduced to one.

Zur Erläuterung des Erfindungsgegenstandes dienen die Fig. 1 und 2. Hierin ist die Relativgeschwindigkeit (Austrittsgeschwindigkeit) des Arbeitsmittels mit w, die des Kühlmittels mit wk, die Absolutgeschwindigkeit des Arbeitsmittels mit c, die des Kühlmittels mit ck sowie die Umfangsgeschwindigkeit mit u bezeichnet. Ist nach Abb. ι die Ausströmgeschwindigkeit des Kühlmittels beispielsweise kleiner als die des Arbeitsmittels, so zeigt sich, daß die Absolutgeschwindigkeiten weder richtungs- noch größenmäßig übereinstimmen. Eine Übereinstimmung dieser Größen ist nach Fig. 2 erreicht, worauf die Erkenntnisse der Erfindung Anwendung gefunden haben.1 and 2. Here, the relative speed (exit speed) of the working fluid is designated by w, that of the coolant by w k , the absolute speed of the working fluid by c, that of the coolant by c k and the peripheral speed by u . If, according to Fig. Ι, the outflow speed of the coolant is, for example, lower than that of the working medium, it can be seen that the absolute speeds do not match either in terms of direction or size. A correspondence of these sizes is achieved according to FIG. 2, to which the findings of the invention have found application.

Claims (1)

Patentansprüche:Patent claims: Innengekühlte Turbinenschaufel, bei der das Kühlmittel längs der radialen Ausdehnung der Schaufel durch eine Anzahl übereinander angeordneter Kanäle in Strömungsrichtung des Arbeitsmittels austritt, gekennzeichnet durch eine derartige Größenbemessung der Austrittsgeschwindigkeit des Kühlmittels, daß sich bei ihrer vektoriellen Addition mit der Umfangsgeschwindigkeit eine Resultierende für die Absolutgeschwindigkeit ergibt, deren Richtung und Größe mit dem Vektor der Absolutgeschwindigkeit des Arbeitsmittels an der Schaufelaustrittskante zumindest annähernd übereinstimmt.Internally cooled turbine blade, in which the coolant is distributed along the radial extent of the Shovel through a number of channels arranged one above the other in the direction of flow of the working medium exits, characterized by such a dimensioning of the exit velocity of the coolant that at Its vectorial addition with the peripheral speed produces a resultant for the absolute speed whose direction and magnitude are compared with the vector of the absolute velocity of the working fluid at least approximately at the blade trailing edge matches. Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DEB7951D 1938-09-12 1942-02-01 Internally cooled turbine blade Expired DE908975C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB7951D DE908975C (en) 1938-09-12 1942-02-01 Internally cooled turbine blade

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE120938X 1938-09-12
DE90840X 1940-08-09
DE60241X 1941-02-06
DEB7951D DE908975C (en) 1938-09-12 1942-02-01 Internally cooled turbine blade

Publications (1)

Publication Number Publication Date
DE908975C true DE908975C (en) 1954-04-12

Family

ID=27430369

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB7951D Expired DE908975C (en) 1938-09-12 1942-02-01 Internally cooled turbine blade

Country Status (1)

Country Link
DE (1) DE908975C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1233658B (en) * 1960-01-05 1967-02-02 Rolls Royce Blade for gas turbine engines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1233658B (en) * 1960-01-05 1967-02-02 Rolls Royce Blade for gas turbine engines

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