DE249844C - - Google Patents
Info
- Publication number
- DE249844C DE249844C DENDAT249844D DE249844DA DE249844C DE 249844 C DE249844 C DE 249844C DE NDAT249844 D DENDAT249844 D DE NDAT249844D DE 249844D A DE249844D A DE 249844DA DE 249844 C DE249844 C DE 249844C
- Authority
- DE
- Germany
- Prior art keywords
- impeller
- case
- blades
- blade
- water
- 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.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
Classifications
-
- 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
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
- F03B3/121—Blades, their form or construction
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
Description
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
Bei Turbinen, besonders bei Wasserturbinen, hat am Laufradeintritt die Geschwindigkeit relativ zum Laufrad bei verschiedenen Betriebszuständen eine verschiedene Richtung.In the case of turbines, especially in the case of water turbines, the speed is at the impeller inlet a different direction relative to the impeller in different operating states.
Wenn der Winkel der Laufradschaufeln so bemessen wird, daß für einen bestimmten Betriebszustand die Relativrichtung des aus dem Leitrade ankommenden Wassers in die Endtangente der Laufradschaufel (oder in eineWhen the angle of the impeller blades is dimensioned so that for a certain operating condition the relative direction of the water arriving from the guide vane into the end tangent the impeller blade (or in a
ίο andere, als vorteilhaft betrachtete Richtung) fällt, so ist dies bei anderen Betriebszuständen, z. B. bei anderen Leitradöffnungen oder verändertem Gefalle, .-nicht mehr der Fall. In der schematischen Fig. ι ist gezeigt, welche Folgen diese Abweichung bei den bekannten, vorn zugespitzten Laufradschaufeln hat. Eine Abweichung der. dargestellten Art tritt z.B. ein, wenn die Turbine unter erniedrigtem Gefälle bei unveränderter Umlaufzahl oder mitίο other direction considered advantageous) falls, this is the case with other operating conditions, e.g. B. with other stator openings or changed liking,. -not the case anymore. The schematic Fig. Ι shows the consequences of this deviation in the known, has tapered impeller blades. A deviation from the. represented type occurs e.g. on, if the turbine has a reduced gradient with unchanged number of revolutions or with
ao einem weniger als normal geöffneten Leitrade arbeitet. Da der Wasserstrom der scharfen Kante b an der Spitze der Laufradschaufeln a nicht zu folgen vermag, löst er sich von der Schaufel ab, so daß ein Wirbelraum c entsteht. Die Wirbel vermindern den Wirkungsgrad, außerdem erzeugen sie erfahrungsgemäß Anfressungen der Schaufeln.ao a less than normally open guide vane works. Since the water flow cannot follow the sharp edge b at the tip of the impeller blades a , it separates from the blade, so that a vortex space c is created. The eddies reduce the efficiency, and experience has shown that they cause pitting of the blades.
Die Ablösung des Strahles von der Schaufel und die Bildung der Wirbel mit ihren unangenehmen Folgeerscheinungen werden nach der vorliegenden Erfindung vermieden, indem die Zuschärfung der Laufradschaufeln unterlassen wird und dieselben vielmehr mit einem dicken gewölbten Kopf d versehen werden, wie in Fig. 2 gezeigt ist. Der ankommende Wasserstrom findet dann unter keinen Umständen eine scharfe Kante vor, sondern eine gewölbte Fläche, welcher er sich leicht anschmiegen kann.The detachment of the jet from the blade and the formation of the eddies with their unpleasant consequences are avoided according to the present invention by omitting the sharpening of the impeller blades and instead providing them with a thick, domed head d , as shown in FIG. Under no circumstances will the incoming stream of water find a sharp edge, but rather a curved surface which it can easily snuggle up to.
Bei mehrstufigen Turbinen kann der dicke gewölbte Kopf auch bei den Leitradschaufeln Vorteile bringen.In the case of multi-stage turbines, the thick, domed head can also be used on the stator blades Bring benefits.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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DE249844C true DE249844C (en) |
Family
ID=508428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DENDAT249844D Active DE249844C (en) |
Country Status (1)
Country | Link |
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DE (1) | DE249844C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0520288A1 (en) * | 1991-06-28 | 1992-12-30 | Asea Brown Boveri Ag | Turbine rotor blade for subsonic flow |
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0
- DE DENDAT249844D patent/DE249844C/de active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0520288A1 (en) * | 1991-06-28 | 1992-12-30 | Asea Brown Boveri Ag | Turbine rotor blade for subsonic flow |
US5228833A (en) * | 1991-06-28 | 1993-07-20 | Asea Brown Boveri Ltd. | Turbomachine blade/vane for subsonic conditions |
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