Wind Ripple in Vertical-Axis Wind Turbines

摘要

The aerodynamically induced fluctuations in the output of a VAWT have often been considered a disadvantage of such systems. The fluctuations observed in the output of a VAWT are composed of contributions due to aerodynamic effects, incident turbulence, and in some cases, mechanical resonances. In order to quantitatively assess these effects, experimental techniques have been developed which allow analysis of full-scale performance of wind turbines with particular emphasis on the effects caused by turbulence in the incident wind. These methods have been used to monitor the performance of the DOE/Sandia 17-m VAWT. Results are presented which provide an indication of the effects of incident turbulence intensity on the fluctuations in output of the turbine. Trends which relate the fluctuations in output to the fluctuations in incident wind are identified and discussed. (ERA citation 07:010572)