Large hydro generators convert the mechanical energy of water turbines into electrical energy. This process is not free of heat losses which have to be dissipated from the machine. For this, different ventilation methods can be applied for an air cooled hydro generator. These methods have not changed very much in the last decades, but there has been a strong enhancement of the calculation and design approaches. State of the art computation methods are thermal and flow networks in combination with 3-dimensional computational fluid dynamics (CFD). The focus of this paper is a CFD analysis of the end winding region as basis for development of correlations between the convective wall heat transfer coefficient (WHTC) and speed and flow rate parameters. These correlations are used as boundary conditions for thermal networks. Furthermore there is also a focus on the influence and sensitivity of the numerical settings on the correlations. This work deals with a reduced numerical model which is designed to calculate a hydro generator fast and accurately by using a steady-state simulation with the mixing plane method. The mixing plane approach is predestined for this kind of design. Considering only one slot section of the end winding bars and stator ducts, the advantages of the stage model can take its full effect. The main advantages are the use of large pitch ratios, periodicities in circumferential direction and the averaging of the fluxes on bands.
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ASME 2013 Power Conference
July 29–August 1, 2013
Boston, Massachusetts, USA
Conference Sponsors:
- Power Division
ISBN:
978-0-7918-5606-2
PROCEEDINGS PAPER
Characteristics of the Convective Heat Transfer Coefficient at the End Winding of a Hydro Generator Available to Purchase
Stephan Klomberg,
Stephan Klomberg
MuSicEl - Graz University of Technology, Graz, Austria
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Ernst Farnleitner,
Ernst Farnleitner
Andritz Hydro GmbH, Weiz, Austria
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Gebhard Kastner,
Gebhard Kastner
Andritz Hydro GmbH, Weiz, Austria
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Oszkár Bíró
Oszkár Bíró
IGTE - Graz University of Technology, Graz, Austria
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Stephan Klomberg
MuSicEl - Graz University of Technology, Graz, Austria
Ernst Farnleitner
Andritz Hydro GmbH, Weiz, Austria
Gebhard Kastner
Andritz Hydro GmbH, Weiz, Austria
Oszkár Bíró
IGTE - Graz University of Technology, Graz, Austria
Paper No:
POWER2013-98093, V002T11A004; 8 pages
Published Online:
February 14, 2014
Citation
Klomberg, S, Farnleitner, E, Kastner, G, & Bíró, O. "Characteristics of the Convective Heat Transfer Coefficient at the End Winding of a Hydro Generator." Proceedings of the ASME 2013 Power Conference. Volume 2: Reliability, Availability and Maintainability (RAM); Plant Systems, Structures, Components and Materials Issues; Simple and Combined Cycles; Advanced Energy Systems and Renewables (Wind, Solar and Geothermal); Energy Water Nexus; Thermal Hydraulics and CFD; Nuclear Plant Design, Licensing and Construction; Performance Testing and Performance Test Codes. Boston, Massachusetts, USA. July 29–August 1, 2013. V002T11A004. ASME. https://doi.org/10.1115/POWER2013-98093
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