Experimental and numerical investigation of blade-tower interaction noise

Branko Zajamšek, Yendrew Yauwenas, Con J. Doolan, Kristy L. Hansen, Victoria Timchenko, John A. Reizes, Colin H. Hansen

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


This paper describes the generation of blade–tower interaction (BTI) noise from upwind turbines and pylon-mounted fans using a combination of experimental and numerical means. An experimental rotor-rig was used in an anechoic chamber to obtain BTI acoustic data under controlled conditions. A computational model, based on the solution of the unsteady Reynolds Averaged Navier Stokes (URANS) equations and Curle's acoustic analogy, was used to describe the generation of fan and simplistic model of wind turbine BTI noise by the rotor-rig. For both the fan and model wind turbine case, the tower was found to be a more significant source of BTI noise than rotor blades. The acoustic waveforms for both turbine and fan are similar; however, in the case of the turbine, the blade contribution reinforces that from the tower, while in the case of a fan, there is some cancellation between the tower source and the blade source. This behavior can be explained by the unsteady aerodynamics occurring during BTI.

Original languageEnglish
Pages (from-to)362-375
Number of pages14
Early online date4 Dec 2018
Publication statusPublished - 17 Mar 2019


  • Blade-tower interaction noise
  • Fluid-structure interaction
  • Wind turbine noise
  • Fan noise


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