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A CFD-Based Throughflow Method with Three-Dimensional Flow Features Modelling

Department of Industrial Engineering, University of Florence, via S. Marta, 3-50139 Florence, Italy
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This paper is an extended version of our paper in Proceedings of the European Turbomachinery Conference ETC12, 2017, Paper No. 329.
Academic Editor: Colin Scrivener
Int. J. Turbomach. Propuls. Power 2017, 2(3), 11; https://doi.org/10.3390/ijtpp2030011
Received: 29 March 2017 / Revised: 16 June 2017 / Accepted: 16 June 2017 / Published: 24 June 2017
The paper describes the development and validation of a novel computational fluid dynamics (CFD)-based throughflow model. It is based on the axisymmetric Euler equations with tangential blockage and body forces and inherits its numerical scheme from a state-of-the-art CFD solver (TRAF code). Secondary and tip leakage flow features are modelled in terms of Lamb–Oseen vortices and a body force field. Source and sink terms in the governing equations are employed to model tip leakage flow effects. A realistic distribution of entropy in the meridional and spanwise directions is proposed in order to compute dissipative forces on the basis of a distributed loss model. The applications are mainly focused on turbine configurations. First, a validation of the secondary flow modelling is carried out by analyzing a linear cascade based on the T106 blade section. Then, the throughflow procedure is used to analyze the transonic CT3 turbine stage studied in the framework of the TATEF2 (Turbine Aero-Thermal External Flows) European program. The performance of the method is evaluated by comparing predicted operating characteristics and spanwise distributions of flow quantities with experimental data. View Full-Text
Keywords: Computational fluid dynamics; Throughflow method; Secondary flows; Tip leakage flows Computational fluid dynamics; Throughflow method; Secondary flows; Tip leakage flows
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Pacciani, R.; Marconcini, M.; Arnone, A. A CFD-Based Throughflow Method with Three-Dimensional Flow Features Modelling. Int. J. Turbomach. Propuls. Power 2017, 2, 11.

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