Large-Eddy Simulations of Two In-Line Turbines in a Wind Tunnel with Different Inflow Conditions

Umberto Ciri, Giovandomenico Petrolo, Maria Vittoria Salvetti and Stefano Leonardi
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Umberto Ciri: Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX 75080, USA
Giovandomenico Petrolo: Dipartimento di Ingegneria Civile e Industriale, Univeristà di Pisa, Pisa 56122, Italy
Maria Vittoria Salvetti: Dipartimento di Ingegneria Civile e Industriale, Univeristà di Pisa, Pisa 56122, Italy
Stefano Leonardi: Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX 75080, USA

Energies, 2017, vol. 10, issue 6, 1-23

Abstract: Numerical simulations reproducing a wind tunnel experiment on two in-line wind turbines have been performed. The flow features and the array performances have been evaluated in different inflow conditions. Following the experimental setup, different inlet conditions are obtained by simulating two grids upstream of the array. The increased turbulence intensity due to the grids improves the wake recovery and the efficiency of the second turbine. However, the inlet grid induces off-design operation on the first turbine, decreasing the efficiency and increasing fatigue loads. Typical grid flow patterns are observed past the rotor of the first turbine, up to the near wake. Further downstream, the signature of the grid on the flow is quite limited. An assessment of numerical modeling aspects (subgrid scale tensor and rotor parameterization) has been performed by comparison with the experimental measurements.

Keywords: wind turbines; grid turbulence; entrainment; large-eddy simulation (LES) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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