Abstract
This experimental study focuses on the implementation via plasma actuators of a circulation control strategy on a wind turbine aerofoil with a rounded trailing-edge with the objective of reducing the aerodynamic load fluctuations on blades. Three sets of multi-DBD (Dielectric Barrier Discharge) actuators with different positions around the trailing-edge are studied. These actuators create a tangential jet that adheres to the blade model wall and diffuses along it. According to the jet direction, lift is increased or decreased. Load and pressure measurements as well as Particle Image Velocimetry (PIV) show respectively the actuation effectiveness in terms of load modification and flow topology alteration.
Highlights
Introduction and work objectivesWind energy is one of the most promising renewable energies for the years to come
This airfoil is used on wind turbine blades at around 70% of the blade span and its shape is structurally interesting because its maximum thickness is located at around 50% of the chord length
The effectiveness of the control has been shown through load and pressure measurements: two actuators are able to increase the lift force and one to decrease it
Summary
The plotted vector profiles are obtained by interpolating the PIV measurement points along the normal lines to the model wall On both flow fields two zones can be highlighted: one acceleration zone along the grounded electrodes where the ambient air is accelerated and the momentum transfer between the charged particles takes place; and one diffusion zone, after the trailing-edge curvature where the induced jet diffuses along the model wall. Further analysis of the pitch moment measurements will be carried in order to better understand the pressure distribution at the trailing-edge with the actuation
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