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    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.


    Yendrew Yauwenas, Branko Zajamšek, John Reizes, Victoria Timchenko, Con Doolan. Directivity of blade-tower interaction noise. JASA express letters. 2021 Jun;1(6):063601

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    PMID: 36154366

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