Air Jets for Lift Control in Low Reynolds Number Flow

horizontal-axis wind turbine;low Reynolds number;jet flap;aerodynamic control;Mechanical Engineering

Skensved, Erik

University of Waterloo

关键词: horizontal-axis wind turbine;    low Reynolds number;    jet flap;    aerodynamic control;    Mechanical Engineering;   

Others  :  https://uwspace.uwaterloo.ca/bitstream/10012/5116/1/Skensved_Erik.pdf

瑞士|英语

来源: UWSPACE Waterloo Institutional Repository

【 摘 要 】

The environmental and monetary cost of energy has renewed interest in horizontal-axis wind turbines (HAWT). One problem with HAWT design is turbulent winds, which cause cyclic loading and reduced life.Controlling short-term aerodynamic fluctuations with blade pitching or mechanical flaps is limited by the speed of actuation.The objective was to investigate using jet-flap-like fluidic actuators on the ;;suction surface;; of an aerofoil for rapid aerodynamic control.A NACA 0025 aerofoil was constructed for wind-tunnel experiments. The low Reynolds number (Re) flow was measured non-intrusively with particle image velocimetry (PIV).The jet showed limited effect compared to published work. The sharp trailing edge and distance to the jet were determined to be critical factors.At Re≈100000 the ;;suction surface;; jet sheet is less useful for control than the conventional ;;pressure surface;; sheet. The experiment suggests usage near the blade root on truncated aerofoils.