The aim of this paper is the characterization of the convective heat transfer and its treatment in a 3-D model to calculate the heat transfer and related temperature distribution in large synchronous machines. The wall heat transfer coefficients in the ventilation ducts have been correlated to various design parameters by several computational fluid dynamics simulations and have been defined at the boundaries at the tooth and yoke iron in the numerical model. The losses have been determined in the copper bars and stator iron from electromagnetic calculations. The validation has been made for the stator temperatures with the established conjugate heat transfer method.
Numerische Methoden der Ventilationsauslegung von Hydrogeneratoren werden kontinuierlich verbessert. Die vorliegende Arbeit zeigt eine qualitative Momentaufnahme des Entwicklungsstatus und einen Ausblick der Weiterentwicklung in Andritz Hydro durch eine komprimierte Darstellung Anwender-relevanter und kritischer Eigenschaften der Methoden. Pumpspeichergeneratoren (meist Grenzleistungs-Hydrogeneratoren) werden als Beispiele verwendet. Zur besseren Illustration werden einige Ventilationssysteme und der Auslegungsprozess knapp vorgestellt.Schl€ u usselw€ o orter: Hydrogenerator; Ventilationsauslegung; Str€ o omungsnetzwerk; CFD; Qualit€ a at von CFD-Simulationen
Contemporary methods of ventilation design for pumped storage generators.Numerical methods of ventilation design of hydro generators are continuously improved. The present paper shows a qualitative snap-shot of the state of development and a preview of enhancements in Andritz Hydro by a concise presentation of pertinent (regarding application) and critical characteristics of the methods. Pumped storage generators (mostly maximum-capacity generators) are employed as examples. For a better illustration ventilation-schemes and the design-process are presented briefly.
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