The unsteady simulation of stator/rotor interaction in turbines represents one of the key aspects of the modern CFD codes. Then, a suitable algorithm for the unsteady interaction evaluation is necessary. Several methods have been proposed in the last years and from an industrial point of view the most used is the “Domain Scaling” approach. Nevertheless, a method for treating the unsteady stator/rotor interaction without any geometrical approximation should be used. Then, an approach based on the “Phase Lag” assumption has been considered to study unsteady flows in turbine stages. The in-house 3D URANS HybFlow CFD code has been equipped with a method based on the Fourier series decomposition of the unsteady fluctuations on the interfaces and the periodic boundaries of the computational domain. This method allows simulating multi-row problems by modelling a single passage, then limiting the memory usage and improving the convergence rate. In this work the unsteady method have been validated on a 2D linear test case representing the mid-span of the CT3 high pressure stage, experimentally studied at the von Karman Institut for Fluid Dynamics, in its un-cooled configuration. The obtained results are compared with the available experimental data and with a domain scaling computation. The present work was carried out in the frame of the EU funded TATEF2 project.

On the Implementation of a Phase Lag Approach for Multi-Row Simulations / Salvadori, S.; Adami, P.; Martelli, F.. - ELETTRONICO. - (2011), pp. 1-9. (Intervento presentato al convegno 10th International Symposium on Experimental Computational Aerothermodynamics of Internal Flows tenutosi a Brussels, Belgium nel 4th-7th July).

On the Implementation of a Phase Lag Approach for Multi-Row Simulations

Salvadori S.;
2011

Abstract

The unsteady simulation of stator/rotor interaction in turbines represents one of the key aspects of the modern CFD codes. Then, a suitable algorithm for the unsteady interaction evaluation is necessary. Several methods have been proposed in the last years and from an industrial point of view the most used is the “Domain Scaling” approach. Nevertheless, a method for treating the unsteady stator/rotor interaction without any geometrical approximation should be used. Then, an approach based on the “Phase Lag” assumption has been considered to study unsteady flows in turbine stages. The in-house 3D URANS HybFlow CFD code has been equipped with a method based on the Fourier series decomposition of the unsteady fluctuations on the interfaces and the periodic boundaries of the computational domain. This method allows simulating multi-row problems by modelling a single passage, then limiting the memory usage and improving the convergence rate. In this work the unsteady method have been validated on a 2D linear test case representing the mid-span of the CT3 high pressure stage, experimentally studied at the von Karman Institut for Fluid Dynamics, in its un-cooled configuration. The obtained results are compared with the available experimental data and with a domain scaling computation. The present work was carried out in the frame of the EU funded TATEF2 project.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2760236
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