Communication Dans Un Congrès Année : 2023

Influence of the Reynolds number on the free-windmilling operation of a small dimensions fan

Résumé

The literature dedicated to the wind-milling performance of fans reports that fair accuracy is at the reach of low-order modelling, at least for the prediction of the freewindmilling regime. However the different studies of the literature where conducted for Reynolds numbers high enough to promote an early transition of the boundary layer, and avoid massive separations on the pressure side of the rotor blades. The present paper describes an experimental analysis of the free-windmilling regime, on a low dimension fan designed for cooling applications in aircrafts. The WilLow test facility gives access to this regime for different mass-flows, i.e., different Reynolds numbers. For the highest Reynolds number configuration, it is demonstrated that the flow structure is in accordance with the theoretical expectations, and a linear evolution is observed in the loading to-flow coefficient map. However, the low Reynolds-number configuration induces strong non-linearities, for which massive separation on the rotor blades is suspected. The flow structure is then completely recast, and the span-wise work distribution is affected. The linearity of the loading-to-flow coefficient is then lost, which results in a different value of flow coefficient, which is no more predictable by the available low-order methods. Finally, the ability of more resolved numerical simulations to keep track of this delicate physics effect is checked.

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Dates et versions

hal-04972435 , version 1 (07-04-2025)

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Identifiants

  • HAL Id : hal-04972435 , version 1

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Nicolas Binder, Lucas Sanchez, Adrien Thacker, Ludovic Rojda, Yannick Bousquet. Influence of the Reynolds number on the free-windmilling operation of a small dimensions fan. 15th European Conference on Turbomachinery Fluid dynamics & Turbomachinery, Apr 2023, Budapest, France. ⟨hal-04972435⟩

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