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Numerical simulation of blade-passage noise.
Yendrew Yauwenas1, Branko Zajamšek1, John Reizes1
1School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, New South Wales 2033, Australia.
The Journal of the Acoustical Society of America
|October 2, 2017
Summary
This study simulates rotor blade-tower noise, revealing tower force fluctuations significantly contribute to blade-passage noise. Numerical models accurately predict noise spectra, aiding understanding of blade-tower interactions.
Area of Science:
- Acoustics
- Fluid Dynamics
- Computational Mechanics
Background:
- Rotorcraft and wind turbine noise are significant environmental concerns.
- Blade-passage effects, noise from rotors interacting with structures, require detailed investigation.
Purpose of the Study:
- To numerically investigate noise generated by rotor blade-tower interactions (blade-passage effects).
- To quantify the contribution of blade and tower forces to overall noise.
- To validate simulation results against experimental data.
Main Methods:
- Numerical simulations of a three-bladed rotor interacting with a cylindrical tower.
- Sliding mesh technique for blade rotation simulation.
- Curle's acoustic analogy for noise prediction from flow data.
Main Results:
- Identified intense force fluctuations on both blade and tower as primary noise sources.
- Demonstrated that tower force fluctuations contribute more significantly to noise than blade fluctuations.
- Successfully predicted noise spectra, showing excellent agreement with experimental measurements.
Conclusions:
- The support tower's contribution to blade-passage noise was previously underestimated.
- The developed numerical model provides a robust framework for analyzing blade-tower interaction noise.
- Findings are applicable to various rotorcraft and wind energy systems.
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