Aeroacoustics of Airborne Wind Energy Systems

Master thesis (2023)

Authors

N. Bouman Aerospace Engineering

Contributors

R. Schmehl Wind Energy - Aerospace Engineering (supervisor 1)
D. Ragni Wind Energy - Aerospace Engineering (supervisor 1)
M.F.M. Hoogreef Flight Performance and Propulsion - Aerospace Engineering (supervisor 2)
R. Merino Martinez Aircraft Noise and Climate Effects - Aerospace Engineering (supervisor 2)
Faculty
Aerospace Engineering
Copyright: © 2023 Naomi Bouman
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Published Date

28-06-2023

Language

English

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Faculty

Aerospace Engineering

Abstract

Airborne wind energy systems offer a promising approach for renewable energy generation. However, the noise emissions associated with these systems should be understood and minimized as well to promote their integration and (social) acceptance. This research aims to identify the noise sources of airborne wind energy systems, systems with leading-edge inflatable (LEI) kites and fixed-wing kites in particular, and establish a foundation for future research in this field. Analytical simulations using the Brooks, Pope, and Marcolini model and the Amiet model were combined with experimental measurements for this research.

The analysis of the fixed-wing kite revealed prominent peaks around 1500 Hz and 2000 Hz in the noise spectra, with the higher frequency peak observed at higher kite velocities. Analytical predictions indicated laminar boundary layer vortex shedding and tether vortex shedding as the main noise sources. The study also investigated the directivity of the turbulent boundary layer trailing edge noise, which revealed dipoles that exhibited slight deformations at higher frequencies.

For the LEI kite, noise analysis identified peaks in the sound pressure level around 300-400 Hz and 1000-2000 Hz. Analytical predictions highlighted turbulent boundary layer trailing edge noise and vortex shedding from the tether and bridle lines as the dominant noise sources.

By considering the implications of these findings, the noise impact of airborne wind energy systems can be minimized, fostering their sustainable deployment and acceptance.