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Body-force modeling for aerodynamic analysis of air intake – fan interactions

William Thollet (Airbus Operations SAS, Toulouse, France and Département Aérodynamique Energétique et Propulsion, ISAE – Supaero, Toulouse, France)
Guillaume Dufour (Département Aérodynamique Energétique et Propulsion, ISAE – Supaero, Toulouse, France)
Xavier Carbonneau (Département Aérodynamique Energétique et Propulsion, ISAE – Supaero, Toulouse, France)
Florian Blanc (Airbus Operations SAS, Toulouse, France)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 5 September 2016

414

Abstract

Purpose

The purpose of this paper is to explore a methodology that allows to represent turbomachinery rotating parts by replacing the blades with a body force field. The objective is to capture interactions between a fan and an air intake at reduced cost, as compared to full annulus unsteady computations.

Design/methodology/approach

The blade effects on the flow are taken into account by adding source terms to the Navier-Stokes equations. These source terms give the proper amount of flow turning, entropy, and blockage to the flow. Two different approaches are compared: the source terms can be computed using an analytic model, or they can directly be extracted from RANS computations with the blade’s geometry.

Findings

The methodology is first applied to an isolated rotor test case, which allows to show that blockage effects have a strong impact on the performance of the rotor. It is also found that the analytic body force model underestimates the mass flow in the blade row for choked conditions. Finally, the body force approach is used to capture the coupling between a fan and an air intake at high angle of attacks. A comparison with full annulus unsteady computations shows that the model adequately captures the potential effects of the fan on the air intake.

Originality/value

To the authors’ knowledge, it is the first time that the analytic model used in this paper is combined with the blockage source terms. Furthermore, the capability of the model to deal with flows in choked conditions was never assessed.

Keywords

Acknowledgements

This study was founded by Airbus Operation SAS and ANRT (Association Nationale de la Recherche et de la Technologie). The authors would like to thank Marc Julian and Thierry Surply, for their precious advice and lectures on the functioning of the air-intake aerodynamics.

Citation

Thollet, W., Dufour, G., Carbonneau, X. and Blanc, F. (2016), "Body-force modeling for aerodynamic analysis of air intake – fan interactions", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 26 No. 7, pp. 2048-2065. https://doi.org/10.1108/HFF-07-2015-0274

Publisher

:

Emerald Group Publishing Limited

Copyright © 2016, Emerald Group Publishing Limited

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