Effect of Boundary Layer Tripping on the Aeroacoustics of Small Vertical Axis Wind Turbines

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Small wind turbines are investigated as a possible solution for using wind energy at small scales in urban and suburban areas. Most turbines are suffering from a low aerodynamic performance due to turbulent and complex wind situations in cities. Therefore, increasing aerodynamic performance and reducing noise is an important factor to design small wind turbines. In order to optimize such turbines with respect to noise and efficiency it is important to understand the physical mechanisms. Measuring acoustic in urban environment it is hardly possible to obtain reproducible results, which are necessary for a comprehensively and profoundly investigation. Therefore, experimental studies have to been performed in anechoic wind tunnels. Those tunnels are mostly limited in size, which makes it quite difficult to investigate full small wind turbine models. Hence a model scale has to be used in order to measure the power and acoustic performance. For comparing the model scale results with original turbines, the same flow conditions around the airfoils are necessary. Due to the smaller size of the model scale the relative velocities of the blades are less, which can result in a laminar boundary layer. In order to force transition from laminar to turbulent, boundary layer trips can be used. The focus of this study is to examine and quantify the effect of boundary layer tripping on the aeroacoustics in case of small vertical axis wind turbines.

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Edited by:

Jörg Franke and Markus Michl

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3-9

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J. Weber et al., "Effect of Boundary Layer Tripping on the Aeroacoustics of Small Vertical Axis Wind Turbines", Advanced Engineering Forum, Vol. 19, pp. 3-9, 2016

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October 2016

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[1] C. Hoffman, K. Rohring. Windenergie Report Deutschland, (2014).

[2] E|Home-Center [www. ehome-center. de], (2016).

[3] J. Weber, S. Becker, C. Scheit, J. Grabinger and M. Kaltenbacher. Aeroacoustics of Darrieus wind turbine, International Journal of Aeroacoustics, Vol. 14, Number 5 & 6, (2015).

DOI: https://doi.org/10.1260/1475-472x.14.5-6.883

[4] S. Mertens. Wind Energy in the Built Environment, PhD Thesis, Delft, (2006).

[5] J. Botha and H. Rice. A novel method of vertical axis wind turbine noise prediction, EuroNoise 2015, Maastricht, (2015).

[6] The DeepWind Project [www. deepwind. eu], (2014).

[7] C. Ferreira. The near wake of the VAWT, PhD Thesis, Delft, (2009).

[8] F. Scheurich. Modelling the aerodynamics of vertical-axis wind turbines, PhD Thesis, Glasgow, (2011).

[9] C. Pearson. Vertical Axis Wind Turbine Acoustics, PhD Thesis, Cambridge, (2013).

[10] R. Bos. Self-Starting of a small urban Darrieus rotor, Delft, (2012).

[11] S: McIntosh. Wind Energy for the Built Environment, PhD Thesis, Cambridge, (2009).

[12] S. Wagner, R. Bareiss, G. Guidati. Wind Turbine Noise. Berlin, Springer, (1997).

[13] T.F. Brooks, D. S: Pope, M.A., Marcolini. Airfoil Self-Noise and Prediction. National Aeronautics and Space Administration, Hampton, (1989).

[14] R.W. Paterson, R. K Amiet. Noise of a Model Helicopter due to Ingestion of Turbulence. United Technologies Research Center, East Hartford, (1982).