Experimental and Numerical Study of a New Dynamic Phenomenon for Two-bladed Wind Turbines

摘要

In this paper the dynamics of a two-bladed turbine is investigatednumerically as well as experimentally with respect to how the turbinefrequencies change with the rotor speed. It is shown how the turbinefrequencies of a two-bladed rotor change with the azimuthal position atstandstill and how the frequencies start whirling during rotor rotation.The whirling for two-bladed rotors change with multiple Pcontributions and not only ±1P as is previously seen for three-bladedwind turbine rotors. A three-bladed turbine was also analyzed in similarway and results were compared. This turbine was investigated both in aperfect isotropic condition where all blades have identical properties aswell as an imbalanced edition where one blade had increased mass.