Akhtar, Tayyab Tahir, Moreau, Stephane, Demory, Bruno et Henner, Manuel.
2025.
« Effect of rotor solidity on the aeroacoustics behaviour of automotive cooling fan module ».
In Proceedings of the CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025)
Coll. « Progress in Canadian Mechanical Engineering », vol. 8.
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Résumé
This study analyzes the flow and acoustic characteristics of a low-speed axial flow fan with a rotating ring, focusing on the influence of rotor solidity on noise emission and its directivity. Two rotor configurations, one with seven blades and the other with thirteen, are evaluated at identical flow rates. Numerical simulations are performed using the Lattice- Boltzmann Method (LBM) on an automotive cooling module comprising a shroud, fan, and heat exchanger, employing a medium grid resolution. The findings indicate that increased rotor solidity leads to greater leakage flow and higher thrust fluctuations. However, higher solidity promotes a more uniform flow on the blade surface, reducing negative pressures near the leading edge on the suction side. Simultaneous far-field noise predictions are conducted using an arc of microphones, and the results are compared with experimental data for the seven-bladed rotor. Despite a significant reduction in rotational speed, the thirteen-bladed rotor exhibits more pronounced sub-harmonic humps, characterized by strong vortical structures from leakage flow, compared to the seven-bladed rotor. Sound pressure level spectra calculated at two different operating points show good agreement with experimental data in the high-frequency broadband range, while the thirteen-bladed rotor demonstrates higher amplitudes at lower frequencies where tip leakage noise mostly affects. Sound directivity comparisons for both operating points reveal a consistent dipole radiation pattern, with higher amplitudes along the rotational axis and lower values in the rotational plane for both rotors but higher amplitudes for increased solidity.
| Type de document: | Compte rendu de conférence |
|---|---|
| Éditeurs: | Éditeurs ORCID Hof, Lucas A. NON SPÉCIFIÉ Di Labbio, Giuseppe NON SPÉCIFIÉ Tahan, Antoine NON SPÉCIFIÉ Sanjosé, Marlène NON SPÉCIFIÉ Lalonde, Sébastien NON SPÉCIFIÉ Demarquette, Nicole R. NON SPÉCIFIÉ |
| Date de dépôt: | 18 déc. 2025 15:07 |
| Dernière modification: | 18 déc. 2025 15:07 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32351 |
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