Conference paper ASME GT2014-26937, Düsseldorf, Germany
G. Kröger, U. Siller, J. Dabrowski
Year of publication: 2014
Small scale wind turbines are usually installed in isolated areas to supply local power systems but also become more important in urban areas in terms of a decentralized power supply. The power rating of the majority of available small scale wind turbines however is determinated at very high wind speeds which rarely occur in urban areas. This publication describes in cooperation with enbreeze GmbH the aerodynamic design and optimization of a 1kW small scale wind turbine specifically designed for low wind speeds around 3.5-5.5 m/s typically for urban locations.
The blades are designed by an automated 3D multiobjective optimization in several operation points with regard to max. efficiency over a broad range of wind speeds and an aerodynamically robust design. The simulation approach is unusual for wind turbines, because a compressible CFD code is applied. This rarely used setup is numerically more difficult to handle, but allows a superior prediction of profile performance due to not neglecting local density changes that occur on the blade surface.
A parameter based blade geometry generation, the CFD setup and optimization progress is presented. Finally, an aerodynamic assessment of the chosen blade geometry is discussed.