nrg、thies、riso、vai、vector(5种风速对比实验).doc

Ris?-R-1556(EN) ACCUWIND - Classification of Five Cup Anemometers According to IEC61400-12-1 T.F. Pedersen, J.-?. Dahlberg, Peter Busche Ris? National Laboratory Roskilde Denmark May 2006 Abstract The characteristics of five cup anemometers were investigated in de- tail, and data are presented in figures and tables. The characteristics include: normal wind tunnel calibrations; angular response measurements at 5, 8 and 11m/s; torque coefficient curve measurements from combined tilt and ramp- gust tests, torque coefficient curve measurements for non-tilted conditions; rotor inertia measurements and measurements of friction of bearings at temperatures - 10°C to 40°C. The characteristics are fitted to two different time domain cup anemometer models, and simulations of the cup anemometers are made with ar- tificial wind generators to make classifications according to annex I and J of the standard IEC 61400-12-1 on power performance measurements. Results of clas- sification are shown in graphs of systematic deviations and class index tables. ISBN 87-550-3516-7 2 RIS?-R-1556(EN) Contents Preface 4 1 Introduction 5 2 Cup Anemometer Type Descriptions 5 3 Wind Tunnel and Laboratory Test Results 6 3.1 Normal WT calibrations 6 3.1.1Linear regression results 6 3.1.2Typical time traces from the calibrations 8 3.2 Angular response measurements by tilt tests at FOI 10 3.3 Angular response measurements by tilt tests at DEWI 13 3.4 Torque coefficient curves from combined tilt and ramp-gust tests 15 3.4.3Torque coefficient curves for horizontal flow conditions. 18 3.4.4Comparison of angular response from steady and dynamic measurements 20 3.5 Measurement of Rotor Inertia 22 3.6 Measurement of Friction Characteristics 22 4 Classification 25 4.1 Classification Ranges 25 4.2 Cup Anemometer Models and Fitting 26 4.3 Wind Generation Model 27 4.4 Classification with Inclined-Flow-Torque-Coefficient Model (IFTC) 27 4.4.5Classification of NRG cup anemometer 27 4.4.6Classification of R