“This work was carried out within the framework of the WEAMEC project ASAPe “Add-on Systems for wind turbine performance improvement”, with funding from the Pays de la Loire Region”
The ASAPe project propose to develop a serie of original, robust and simple ADD-ON system, composed of E-penon sensors and/or wireless pressure sensors as well as fluidic actuators of pulsed jet type, capable of dynamically adapting wind turbine blade aerodynamic and thus to decrease aerodynamic loads. This system will be progressively brought to maturity by using a bidimensional blade profile in the aerodynamic wind tunnel of LHEEA lab. (gust at an intermediate scale) and the Jules Verne wind tunnel of CSTB (fluctuating wind at full scale). At full scale, a real wind turbine blade profile will be provided by industrials who have signed a support letter for this projet (EDF-EN and VALOREM). Also, a prospectif work will be conducted to prepare wind field test (choice of the site, the wind turbine type, the position and control strategy …).
We present a new system for the generation of rapid, strong flow perturbations in the aerodynamic wind tunnel at École Centrale de Nantes. The system is called the chopper, and it consists of a rotating bar cutting through the inlet of a wind tunnel test section, thus generating an inverse gust that travels downstream. The flow generated by the chopper is investigated with respect to the rotational frequency using an array equipped with hot-wires that is traversed downstream in the flow field. It is found that the gust can be described as a superposition of the mean gust velocity, an underlying gust shape, and additional turbulence. Following this approach, the evolution of the mean gust velocity and turbulence intensity are presented, and the evolution of the underlying inverse gust shape is explained. The turbulence is shown to be characterized by an integral length scale of approximately half the chopper blade width and a turbulence decay according to E(f)∝f−5/3.
More detail about the ASAPe project