Application of Actuator Line Model for Large Eddy Simulation of Rotor Noise Control

A hybrid Large Eddy Simulation (LES)/Actuator Line Model (ALM) computational approach is employed to simulate the turbulent wake of a two-bladed rotor in hover. Validations are performed for the Knight and Hefner two-bladed rotor case with comparisons to previous LES predictions using the immersed b...

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Bibliographic Details
Published in:Aerospace science and technology 2021-01, Vol.108, p.106405, Article 106405
Main Authors: Delorme, Yann, Stanly, Ronith, Frankel, Steven H., Greenblatt, David
Format: Article
Language:English
Subjects:
Actuator Line Model
Helicopter noise
Large Eddy Simulation
Noise control
Rotor noise
UAV noise
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Summary:A hybrid Large Eddy Simulation (LES)/Actuator Line Model (ALM) computational approach is employed to simulate the turbulent wake of a two-bladed rotor in hover. Validations are performed for the Knight and Hefner two-bladed rotor case with comparisons to previous LES predictions using the immersed boundary method, as well as hybrid RANS-LES using the Helios code. The Ffowcs-Williams Hawkings (FWH) acoustic analogy is then used for predicting rotor noise. Predictions from the combined LES/ALM/FWH model are next validated against recent PIV wake flow and acoustic measurements for a two-bladed rotor. Finally, the LES/ALM/FWH approach is exploited to demonstrate a novel way to explore active flow control strategies to reduce rotor noise by delaying flow separation and enabling a lower rate of rotation, resulting in lower noise while maintaining thrust.
ISSN:1270-9638
1626-3219
DOI:10.1016/j.ast.2020.106405