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Couplages instationnaires de la vapeur humide dans les écoulements de turbines à vapeur

Abstract : In addition to conventional turbomachinery problems, both the behavior and performances of steam turbines are highly dependent on the vapour thermodynamic state and the presence of a liquid phase. EDF, the main French electricity producer, is interested in further developing its' modelling capabilities and expertise in this area to allow for operational studies and long-term planning. This PhD thesis explores the modelling of wetness formation and growth in a steam turbine and an analysis of the coupling between the liquid phase and the main flow unsteadiness. To this end, the work in this thesis took the following approach. Wetness was accounted for using a homogeneous model coupled with transport equations to take into account the effects of non-equilibrium phenomena, such as the growth of the liquid phase and nucleation. The real gas attributes of the problem demanded adapted numerical methods. Before their implementation in the 3D elsA solver, the accuracy of the chosen models was tested using a developed one-dimensional nozzle code. In this manner, various condensation models were considered, including both polydispersed and monodispersed behaviours of the steam. Finally, unsteady coupling effects were observed from several perspectives (1D, 1D − 3D, 3D), demonstrating the ability of the method of moments to sustain unsteady phenomena which were not apparent in a simple monodispersed model.
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Submitted on : Wednesday, April 30, 2014 - 12:02:11 PM
Last modification on : Friday, September 30, 2022 - 10:56:10 AM
Long-term archiving on: : Wednesday, July 30, 2014 - 12:30:13 PM


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  • HAL Id : tel-00985725, version 1


Frédéric Blondel. Couplages instationnaires de la vapeur humide dans les écoulements de turbines à vapeur. Autre. Ecole Centrale de Lyon, 2014. Français. ⟨NNT : 2014ECDL0004⟩. ⟨tel-00985725⟩



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