Loading...

Development of Actuator Disk Method to Simulate Fluid-structure Interaction in Megawatt Wind Turbine Blade Analysis

Behrouzifar, Ali | 2019

163 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 55175 (45)
  4. University: Sharif University of Technolog
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. Recent decades have seen a growing demand for high-power wind turbines resulting in turbines with larger blades and the advent of high-megawatt wind turbines. The blades of the megawatt-scale turbines experience more complicated flow phenomena compared to those of the smaller-scale wind turbines. Needless to say, the importance of an accurate solution and detailed analysis of all the parameters, including blades aerodynamic and aeroelastic performance as well as fluid-structure interaction, is more significant for the megawatt-scale turbines compared to smaller-scale turbines. The conventional methods of aerodynamic solutions for the blade, including analytical methods, such as BEMT78 and FWM79, and CFD-based numerical methods have been used extensively to obtain accurate solutions and perform detailed analysis of the megawatt-scale turbines.The downside, however, is that today’s full-scale numerical methods require heavy computations for the analysis of wind farms, resulting in great difficulties in the design and analysis of the turbines. To circumvent this problem, semi-analytical methods have emerged. The semi-analytical methods retain the [reasonable] convergence rate property attributed to the analytical methods and improve simulation accuracy compared to the fullscale numerical methods. The Actuator Disk Method (ADM) is the semi-analytical technique used in the present work.First, the ADM is investigated in detail and a suitable equivalent thickness value for the blade is determined using optimization techniques. The investigation is carried out for a 5MW NREL wind turbine using the data provided by the manufacturer of the turbine. It is worth noting that the rate of convergence is increased by approximately 232%.Furthermore, the megawatt-scale turbine is studied using a new technique developed in this paper for the analysis of fluid-structure interaction using the AD-FSI80 method, and verification against reputable references is provided. The results indicate that all of the aerodynamic and structural parameter values obtained, including the generated power, thrust, and blade flexural, longitudinal, and lateral curvature are in complete agreement with the results reported in the literature. By using the presented method, the rate of convergence is increased significantly, while the same accuracy as in the existing methods is fully retained
  9. Keywords:
  10. Actuator Disk Method ; Wind Turbine ; Fluid-Structure Interaction ; Blade Element Momentum Theory ; Fins ; Computational Fluid Dynamics (CFD) ; Flexible Blade

 Digital Object List

 Bookmark

No TOC