Rasmussen, Flemming

The paper describes measurements of the aerodynamic properties of a 17.2 m diameter LM rotor muntetd on a VESTAS 55 kW windmill. Power curves were measured for a range of balde tip angles to find the best angle both in relation to energy production and stalling characteristics. With this optimum blade setting the flapwise blade root bending moment was measued as a function of wind speed. Also the drag coefficient at 90° angle of attack is calculated from measurements of the integrated value, i.e. the flapwise blade root bending moment as a function of wind speed during stand still. With some simplified considerations the profile properties (CL, CD curves) are estimated from aerodynamic calculations and the results compared to existing profile data from 3-dimensional wind tunnel measurements. The flapwise blade root bending moment versus blade angular position during one revolution was measured in skew wind and is compared with calculations. The influence of surface roughness introduced at a certain percentage of the section chord and the dependency on the Reynolds Number is investigated and discussed form observed discrepancies in the measured power curves

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Aerodynamic Performance of New LM 17.2 m Rotor

http://orbit.dtu.dk/ws/files/151471818/ris_m_2467.pdf

Aerodynamic Performance of New LM 17.2 m Rotor

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