Numerical investigation of the wake interaction between two model wind turbines with span-wise offset

Sasan Sarmast, Hamid Sarlak Chivaee, Stefan Ivanell, Robert Flemming Mikkelsen

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Abstract

Wake interaction between two model scale wind turbines with span-wise offset is investigated numerically using Large Eddy Simulation (LES) and the results are validated against the experimental data. An actuator line technique is used for modeling the rotor. The investigated setup refers to a series of experimental measurements of two model scale turbines conducted by NTNU in low speed wind tunnel in which the two wind turbines are aligned with a span-wise offset resulting in half wake interaction. Two levels of free-stream turbulence are tested, the minimum undisturbed level of about Ti ≈ 0.23% and a high level of about Ti ≈ 10% using a passive upstream grid.

The results show that the rotor characteristics for both rotors are well captured numerically even if the downstream rotor operates into stall regimes. There are however some difficulties in correct prediction of the thrust level. The interacting wake development is captured in great details in terms of wake deficit and streamwise turbulence kinetic energy.

The present work is done in connection with Blind test 3 workshops organized jointly by NOWITECH and NORCOWE.
Original languageEnglish
Article number012137
Book seriesJournal of Physics: Conference Series (Online)
Volume524
Issue number1
Number of pages10
ISSN1742-6596
DOIs
Publication statusPublished - 2014
Event5th International Conference on The Science of Making Torque from Wind 2014 - Technical University of Denmark, Copenhagen, Denmark
Duration: 10 Jun 201420 Jun 2014
Conference number: 5
http://indico.conferences.dtu.dk/conferenceDisplay.py?confId=138

Conference

Conference5th International Conference on The Science of Making Torque from Wind 2014
Number5
LocationTechnical University of Denmark
CountryDenmark
CityCopenhagen
Period10/06/201420/06/2014
Internet address

Bibliographical note

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd

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