Stability analysis of the tip vortices of a wind turbine

• The aim of the present project is to get a better understanding of the stability properties of wakes generated by wind turbine rotors. To determine the stability properties of wind turbine wakes a numerical study on the stability of the tip vortices behind the Tjaereborg wind turbine has been carried out. The numerical model is based on large eddy simulations of the Navier-Stokes equations using the actuator line method to generate the wake and the tip vortices. To determine critical frequencies the flow is perturbed by inserting a harmonic perturbation. The results show that the instability is dispersive and that growth arise only for some specific frequencies and type of modes.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Teknisk mekanik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Applied Mechanics (hsv//eng)

Nyckelord

Critical frequencies

Harmonic perturbations

Numerical models

Numerical studies

Specific frequencies

Stability analysis

Stability properties

Tip vortex

Wind turbine rotors

Wind turbine wakes

Aerodynamics

Aerospace engineering

Computer simulation

Flow control

Navier Stokes equations

Wakes

Wind power

Wind tunnels

Wind turbines

Stability

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