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Experimental Investigation of Reduced Frequency Effects on the Aerodynamic Efficiency of a New Wind Turbine Blade Section in Pitching Motion

Khorshidian, Nima | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50348 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Soltani, Mohammad Reza
  7. Abstract:
  8. In recent years, renewable energy equipments such as wind turbines has become more common for electric power generation. Due to the complexity of the aerodynamics of wind turbines,experimental studies in this field are very important. The purpose of this study is to investigate the aerodynamic performance of a new wind turbine airfoil in static mode and pitching motion.The airfoil is a section of 2 MW wind turbine blade, pitching around its quarter-chord axis .All experiments are carried out in a subsonic wind tunnel. In these experiments, the reynolds number is 140,000 and the reduced frequency varies from 0.034 to 0.126. Pressure transducers have been used to determine the pressure distribution of airfoil surface and the lift and drag forces are calculated for different cases. To evaluate the effects of dust and contamination on the airfoil performance, a trip strip is applied near the leading edge on the upper surface. The roughness reduced the maximum lift, but avoided the sudden drop in lift curve, delayed the stall and reduced the pressure drag. In dynamic experiments, reduced frequency variation is investigated as an effective factor on the airfoil performance. Its effect on the width of lift and drag hysteresis loops are evident. In addition to the experimental results, the numerical results of XFOIL and Fluent are also presented to assess the ability of these codes in predicting aerodynamic coefficients
  9. Keywords:
  10. Airfoil ; Wind Turbine ; Pressure Distribution ; Pitching Motion ; Reduced Frequency ; Subsonic Wind Tunnel

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