# 8th European PostgraduateFluid Dynamics Conference

## 6th – 9th July 2016Warsaw, Poland

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# Study of far wake behind a combination of two wind-turbine models and thin disks

Ivan Litvinov1, Elizaveta Gesheva1, Igor Naumov1, Valery Okulov2, Robert Mikkelsen2
1Institute of Thermophysics, SB RAS, Novosibirsk 630090, Russia
2Institute of Thermophysics, SB RAS, Novosibirsk 630090, Russia; Department of Wind Energy, Technical University of Denmark, 2800 Lyngby, Denmark
In spite of the extensive studies, the prediction of wake evolution and decay are still open questions. Stereo-PIV experiments were carried out to study the development of mean velocity profiles of the far wake behind a combination of two wind turbine models and disks in a DTU water flume. The models are placed in a middle of the flume with a uniform flow and a very low turbulence level separately for two cases. The rotor is three-bladed and designed using Glauerts optimum theory at a tip speed ratio $\lambda$ =5. The wake development has been studied in the wide range of $\lambda$, L (a length between bodies) and at different cross-sections from 10D to 40D downstream from the first body. In order to fit velocity profiles regression techniques were used therefore it was possible to obtain accurate velocity deficits of the wake attenuation. The data are compared with analytical model (Johansson et al, 2003) for wind turbine and disk
Keywords: Applied fluid dynamics, Experimental techniques