Generic properties of flows in low-speed axial fans operating at load-controlled windmill

[+] Author and Article Information
Aurélie Ortolan

SAFRAN Ventilation Systems, Blagnac, France, Université de Toulouse, ISAE-SUPAERO, Toulouse, France

Suk-Kee Courty-Audren

Université de Toulouse, ISAE-SUPAERO, Toulouse, France

Massyl Lagha

Université de Toulouse, ISAE-SUPAERO, Toulouse, France

Nicolas Binder

Université de Toulouse, ISAE-SUPAERO, Toulouse, France

Xavier Carbonneau

Université de Toulouse, ISAE-SUPAERO, Toulouse, France

Florent Challas

SAFRAN Ventilation Systems, Blagnac, France

1Corresponding author.

ASME doi:10.1115/1.4040678 History: Received January 12, 2018; Revised June 26, 2018


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 compressor 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 behaviours were identified as typical of fans operating at windmill: the inverse stacking of the speed lines visible in (?, 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.

Copyright (c) 2018 by ASME
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