We were currently simulating the 5MW NREL Baseline Turbine as reference case for further studies in passive flow control. One interessting case is at about 18 m/s with 12.1 RotSpeed and 14.92 BlPitch(1,2,3). We were wondering that the angles of attack at RP 12-14 for a turbulent wind field IEC1 A 18m/s had negative values of about -1 to -2 degree. Is that the design point to achieve constant values for torque and and power output or are we making a mistake here?
Thanks a lot for your response