Computational investigation of flow control by means of tubercles on Darrieus wind turbine blades

26th IUPAP Conference on Computational Physics

物理学;计算机科学

Sevinc, K.^1 ; Ozdamar, G.^2 ; Sentürk, U.^2 ; Ozdamar, A.^2

FIGES Inc., Tepekule Is Merkezi, Bayrakli, Izmir

35010, Turkey^1

Ege University Faculty of Engineering, Mechanical Engineering Department, Bornova Izmir

35040, Turkey^2

关键词: Boundary-layer control;    Computational investigation;    Computational studies;    Darrieus turbine;    Darrieus wind turbines;    Power coefficients;    Tip speed ratio;    Vertical axis wind turbines;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/640/1/012034/pdf
DOI  :  10.1088/1742-6596/640/1/012034

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

This work presents the current status of the computational study of the boundary layer control of a vertical axis wind turbine blade by modifying the blade geometry for use in wind energy conversion. The control method is a passive method which comprises the implementation of the tubercle geometry of a humpback whale flipper onto the leading edge of the blades. The baseline design is an H-type, three-bladed Darrieus turbine with a NACA 0015 cross-section. Finite-volume based software ANSYS Fluent was used in the simulations. Using the optimum control parameters for a NACA 634-021 profile given by Johari et al. (2006), turbine blades were modified. Three dimensional, unsteady, turbulent simulations for the blade were conducted to look for a possible improvement on the performance. The flow structure on the blades was investigated and flow phenomena such as separation and stall were examined to understand their impact on the overall performance. For a tip speed ratio of 2.12, good agreement was obtained in the validation of the baseline model with a relative error in time- averaged power coefficient of 1.05%. Modified turbine simulations with a less expensive but less accurate turbulence model yielded a decrease in power coefficient. Results are shown comparatively.