Title
Real-time reconstruction of unsteady rotating forces acting by rotor blades in moving medium
Author
Xu, Ying (Hefei University of Technology)
Casalino, D. (TU Delft Wind Energy) 
Zhang, Xiao Zheng (Hefei University of Technology)
Zhang, Yong Bin (Hefei University of Technology)
Bi, Chuan Xing (Hefei University of Technology)
Date
2024
Abstract
A time-domain inverse aeroacoustic method based on the convective Ffowcs Williams–Hawkings equation is presented. The method allows to determine, in real-time, the unsteady forces exerted on rotating blades in the presence of a moving medium. The inversion procedure is based on a space-time regularization with a mixed l1,2-norm, which guarantees accuracy and smoothness of the solution. The method is initially verified through synthetic acoustic signals emitted by rotating sources in a constant flow, up to a convective Mach number of about 0.88. Then the method is validated through signals generated by a propeller immersed in a wind-tunnel jet flow, up to a Mach number of 0.06. Due to the reduced convective Mach number, the leading aeroacoustic effect is derived from a variation of the blade loading. It is argued that the onset of flow separation at high values of the rotor advance ratio is responsible for the onset of force fluctuations that the inverse method is able to retrieve both qualitatively and quantitatively.
Subject
Inverse aeroacoustic method
Moving medium
Real-time reconstruction
Rotor noise
Unsteady rotating forces
To reference this document use:
http://resolver.tudelft.nl/uuid:a7f84fae-2283-488d-8d22-a9ea4900014d
DOI
https://doi.org/10.1016/j.jsv.2023.117972
Embargo date
2024-01-01
ISSN
0022-460X
Source
Journal of Sound and Vibration, 568
Part of collection
Institutional Repository
Document type
journal article
Rights
© 2024 Ying Xu, D. Casalino, Xiao Zheng Zhang, Yong Bin Zhang, Chuan Xing Bi