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A innovative modeling approach to investigate the efficiency of cross flow water turbine farms

Abstract : In 2001, the Geophysical and Industrial Fluid Flows laboratory (LEGI-France) launched the HARVEST research program (Hydroliennes à Axe de Rotation VErtical STabilisé) to better understand and develop a suitable technology for hydroelectric marine or river power farms using Cross Flow Water Turbines (CFWT) piled up in towers. The LEGI researches deal with the hydrodynamic part of these systems, with the support of the R&D Division of the EDF Group; other laboratories of the Rhône-Alpes Region are in charge of the respective mechanical (3S-INPG and LDMS-INSA) and electrical aspects (LEG-INPG). The present study deals with the study of CFWT arrangements. In a first part, a single turbine for free fluid flow conditions is considered. The simulations are carried out with a new in house code which couples a Navier-Stokes computation of the outer flow field with a description of the inner flow field around the turbine. The latter approach is validated with experimental results of a Darrieus wind turbine in an unbounded domain. This code is then applied for the description of a hydraulic turbine. We then pile up these turbines in the shape of towers and study the efficiency of several lined up towers which makes a barge. Simulations are now bidimensional and show that the average barge efficiency rises as the distance between towers is decreased. Eventually an HARVEST farm, consisting of several barges is investigated. Aligned and staggered rows architectures are considered. Results show that staggered rows architecture is more interesting provided enough space is let between rows.
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Sylvain Antheaume, Thierry Maître, Jean-Luc Achard. A innovative modeling approach to investigate the efficiency of cross flow water turbine farms. 2nd IAHR International Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems, Oct 2007, Timisoara, Romania. ⟨hal-00266170⟩

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