TY - JOUR
T1 - Application of Actuator Line Model for Large Eddy Simulation of Rotor Noise Control
AU - Delorme, Yann
AU - Stanly, Ronith
AU - Frankel, Steven H.
AU - Greenblatt, David
N1 - Publisher Copyright:
© 2020 Elsevier Masson SAS
PY - 2021/1
Y1 - 2021/1
N2 - 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.
AB - 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.
KW - Actuator Line Model
KW - Helicopter noise
KW - Large Eddy Simulation
KW - Noise control
KW - Rotor noise
KW - UAV noise
UR - http://www.scopus.com/inward/record.url?scp=85097761674&partnerID=8YFLogxK
U2 - 10.1016/j.ast.2020.106405
DO - 10.1016/j.ast.2020.106405
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AN - SCOPUS:85097761674
SN - 1270-9638
VL - 108
JO - Aerospace Science and Technology
JF - Aerospace Science and Technology
M1 - 106405
ER -