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Published on: October 5, 2018
Directivity of blade-tower interaction noise
Yendrew Yauwenas1, Branko Zajamšek2, John Reizes1
1School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, New South Wales 2035, Australia.
Abstract:
This paper presents a combined experimental and numerical study that characterises the directivity of blade-tower interaction (BTI) noise. Numerical computations were performed using a hybrid approach combining unsteady Reynolds-averaged Navier-Stokes equations and Curle's acoustic analogy, allowing the noise from the blades and the tower to be computed separately. The noise directivity of the blade and the tower components have a dipole pattern and a monopole-like pattern, respectively; hence, the resulting BTI noise directivity resembles an oval. Partial cancellations between the blade and tower components are also shown to affect the BTI noise directivity.
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