Influence of Tip Speed Ratio on Wake Flow Characteristics Utilizing Fully Resolved CFD Methodology

Wake Conference 2017

Siddiqui, M. Salman^1 ; Rasheed, Adil^2 ; Kvamsdal, Trond^1,2 ; Tabib, Mandar^2

Department of Mathematical Sciences, Norwegian University of Science and Technology, Trondheim

NO-7491, Norway^1

SINTEF ICT, Department of Applied Mathematics, Postboks 4760, Sluppen, Trondheim

NO-7465, Norway^2

关键词: CFD methodologies;    High-fidelity simulations;    Multiple-reference frames;    Numerical methodologies;    Tip speed ratio;    Variable operating condition;    Wake distributions;    Wake evolutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/854/1/012043/pdf
DOI  :  10.1088/1742-6596/854/1/012043

来源: IOP

【 摘 要 】

Dominant flow structures in the wake region behind the turbine employed in the Blind Test campaign [1], [2] is investigated numerically. The effect on the wake configuration at variable operating conditions are studied. The importance of the introduction of turbine tower inside the numerical framework is highlighted. High-fidelity simulations are performed with Multiple Reference Frame (MRF) numerical methodology. A thorough comparison among the cases is presented, and the wake evolution is analyzed at variable stations downstream of the turbine. Streamlines of flow field traveled towards ground adjacent to turbine tower and strongly dependent on the operating tip speed ratio. Wake is composed of tower shadow superimposed by rotor wake. Shadow of the tower varies from x/R=2 until x/R=4 and breaks down into small vortices with the interaction of rotor wake. This study also shows that the wake distribution consists of two zones; inner zone composed of disturbances generated by blade root, nacelle and the tower, and an outer zone consisting of tip vortices.