Noise from a Model-Scale Vertical-Axis Wind Turbine

Vertical-axis wind turbines are an attractive option for small-scale wind-power installations. In this application, noise is crucially important. To investigate the problem, measurements taken from a model-scale turbine in tunnel considered. The sound radiated by model clearly evident cross spectra pair of flush-mounted microphones. Parameter studies show that, normal operating range, speed dominant factor. main source appears to be blade self-noise, although there also indications blade–wake interaction downstream half rotation path. Boundary-layer trips have significant impact, showing that laminar instability important contributor self-noise. It will remain risk at full scale, and its absence should ensured design stage. minimize remaining radiation (at given speed), configurations with lower tip-speed ratio maximum power output preferred ones having higher values parameter.