A1 Journal article (refereed), original research

Performance and Wake Comparison of Horizontal and Vertical Axis Wind Turbines under Varying Surface Roughness Conditions

Open Access publication

Publication Details
Authors: Mendoza Victor, Chaudhari Ashvinkumar, Goude Anders
Publisher: Wiley: 12 months
Publication year: 2018
Language: English
Related Journal or Series Information: Wind Energy
Journal acronym: WE
Start page: 1
End page: 15
Number of pages: 15
ISSN: 1095-4244
eISSN: 1099-1824
JUFO-Level of this publication: 2
Permanent website address: https://doi.org/10.1002/we.2299
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe201901071466


A numerical study of both a horizontal axis wind turbine (HAWT) and a
vertical axis wind turbine (VAWT) with similar size and power rating is
presented. These large scale turbines have been tested when operating stand‐alone at their optimal tip speed ratio (TSR) within a neutrally
stratified atmospheric boundary layer (ABL). The impact of three
different surface roughness lengths on the turbine performance is
studied for the both turbines. The turbines performance, the response to
the variation in the surface roughness of terrain, and the most
relevant phenomena involved on the resulting wake were investigated. The
main goal was to evaluate the differences and similarities of these two
different types of turbine when they operate under the same atmospheric
flow conditions. An actuator line model (ALM) was used together with
the large eddy simulation (LES) approach for predicting wake effects,
and it was implemented using the open‐source computational fluid
dynamics (CFD) library OpenFOAM to solve the governing equations and to
compute the resulting flow fields. This model was first validated using
wind tunnel measurements of power coefficients and wake of interacting
HAWTs, and then employed to study the wake structure of both full scale
turbines. A preliminary study test comparing the forces on a VAWT blades
against measurements was also investigated. These obtained results
showed a better performance and shorter wake (faster recovery) for an
HAWT compared with a VAWT for the same atmospheric conditions.

Last updated on 2019-13-03 at 12:00