Linear stability analysis for an optimum Glauert rotor modelled by an actuator disc

The Science of Making Torque from Wind 2014

Smith, D.M.^1 ; Blackburn, H.M.^1 ; Sheridan, J.^1

Monash University, Wellingon Road, Clayton, VIC, Australia^1

关键词: Actuator disc;    Axisymmetric;    Azimuthal modes;    Far-field wakes;    Linear Stability;    Stability properties;    Stable modes;    Tip speed ratio;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/524/1/012150/pdf
DOI  :  10.1088/1742-6596/524/1/012150

来源: IOP

【 摘 要 】

We approximate a wind turbine using the Actuator Disc methodology with loading for an optimum Glauert rotor, and vary blade length and tip speed ratio, to determine base flows for linear stability computations at a Reynolds number of 100. Results from such computations suggest that the least stable mode is axisymmetric and insensitive to changes in tip speed operation, suggesting that the stability properties in the farfield wake for an optimised rotor are independent of the chosen tip speed optimization point. Higher azimuthal modes promote greater variation in velocities and may be relevant to cases at higher Reynolds numbers.