Generic Properties of Flows in Low-Speed Axial Fans Operating at Load-Controlled Windmill

Author:

Ortolan Aurélie1,Courty-Audren Suk-Kee2,Lagha Massyl2,Binder Nicolas2,Carbonneau Xavier2,Challas Florent3

Affiliation:

1. Aerodynamic Department, SAFRAN Ventilation Systems, Blagnac 31700, France; Department of Aerodynamics, Energetics and Propulsion, Université de Toulouse ISAE-SUPAERO, Toulouse 31400, France e-mail:

2. Department of Aerodynamics, Energetics and Propulsion, Université de Toulouse ISAE-SUPAERO, Toulouse 31400, France

3. Aerodynamic Department, SAFRAN Ventilation Systems, Blagnac 31700, France

Abstract

This paper aims at underlining the existence of some generic properties of windmilling flows, partially spread in the literature but never clearly stated. Two kinds of axial machines are investigated from compressor mode to highly loaded windmill: a conventional fan with poor turbine performance and an optimized fan able to reach high efficiencies in both compressor and windmilling operations. Both simulations and experiments are used to perform the analysis. Three particular behaviors were identified as typical of fans operating at windmill: the inverse stacking of the speed lines visible in (Π, Qm) turbine maps, the appearance of a slope change on the loading-to-flow coefficient diagram at windmill, and a threshold effect occurring at highly loaded windmill.

Publisher

ASME International

Subject

Mechanical Engineering

Reference27 articles.

1. Binder, N., 2016, “Aérothermodynamique Des Turbomachines En Fonctionnement Hors-Adaptation,” Habilitation thesis, ISAE-SUPAERO, Toulouse, France.

2. Dufour, G., Margalida, G., and García Rosa, N., 2015, “Integrated Flow Simulation of the Fan and High-Pressure Compressor Stages of a Turbofan at Windmill,” Tenth European Conference on Turbomachinery, Madrid, Spain, Mar. 23–27, Paper No. ETC2015-150.http://oatao.univ-toulouse.fr/13867/

3. Garcia Rosa, N., Pilet, J., Lecordix, J.-L., Barènes, R., and Lavergne, G., 2013, “Experimental Analysis of the Flow Through the Fan Stage of a High-Bypass Turbofan in Windmilling Conditions,” Tenth European Conference on Turbomachinery, Lappeenranta, Finland, Apr. 15–19, Paper No. ETC2013-162.http://www.euroturbo.eu/publications/proceedings-papers/etc2013-162/

4. Loss and Deviation in Windmilling Fans;ASME J. Turbomach.,2016

5. Mohankumar, B., and Wilson, M. J., 2017, “Rotational Speed of a Damaged Fan Operating at Windmill,” 12th European Conference on Turbomachinery, Stockholm, Sweden, Apr. 3–7, Paper No. ETC2017-096.

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