The e-TellTale sensor is already used on the sails of some boats and can be glued onto the aerodynamic surface of wind turbine blades for retrofitting purposes.įirst tests of this innovative sensor were conducted at a low Reynolds number using a downscaled device ( Soulier et al., 2021). When the silicone strip goes away from the surface, the displacement is measured by the strain gauge. The system is composed of a silicone strip with a strain gauge at its base. A simple and robust alternative to this sensor is the use of electronic TellTale (e-TellTale) sensors. Swytink-Binnema and Johnson ( 2016) have demonstrated the possibility of detecting aerodynamic flow separation using distributed tufts over the blade surface and a blade-root-embedded camera. Furthermore, they could be used together with active devices to further decrease local spatio-temporal loads ( Shaqarin et al., 2013 Jaunet and Braud, 2018). Having local and robust aerodynamic sensors at the blade scale placed at key areas would be an important step for wind turbine monitoring and operation. Also, pitch control on very large blades is not fast enough to account for the small timescales from small turbulent structures generated in a wind turbine wake for instance ( Chamorro et al., 2012), while the small turbulent structures have a strong impact on blade loads ( Bartholomay et al., 2018).
Sufficiently take into account the state of the flow on the aerodynamic surfaces (attached/separated, laminar/transitional or turbulent aerodynamic boundary layer), which is critical to deciding a control action. However, measurements at the wind turbine nacelle do not The control objective is to alleviate turbine blade lift fluctuations and resulting load fluctuations by an adequate adjustment of the blade incidence. This lidar system will predict flow perturbations (gust, misalignment, etc.) before a control action of the blade is performed.
Upstream flow measurements from a nacelle-mounted lidar are also under development ( Scholbrock et al., 2013). Sensors currently used are located on the wind turbine nacelle such as cup anemometers ( Smaïli and Masson, 2004) and on the wind turbine spinner ( Pedersen et al., 2015). In order to limit the influence of these disturbances on the wind turbine, modern pitch-regulated wind turbines are operational today. A cause of premature aging often put forward is the accumulation of loads imposed by the strong shears upstream of the rotor due to an incorrect setting of the wind turbine or to the atmosphere in which it operates ( Rezaeiha et al., 2017). Increasing the life of wind turbines is one of the major areas of investigation faced by wind farm operators.
0 kommentar(er)
