Date of Award
January 2025
Document Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Mechanical Engineering
First Advisor
Cai Xia Yang
Abstract
The aeroelastic behavior of biplane wind turbine blades is investigated through the development and validation of an improved coupled Blade Element Momentum (BEM) theory. Biplane configurations, known for their potential to enhance wind turbine efficiency by increasing lift-to-drag ratios and reducing fatigue loads, present unique challenges due to the complex interactions between aerodynamic forces and structural dynamics. This research begins by exploring configuration parameters such as gap, stagger, pitch angle, and decalage to assess their impact on aerodynamic performance. Utilizing an enhanced BEM approach, a robust computational model is developed, integrating advanced aerodynamic corrections, dynamic stall models, and three-dimensional flow effects to predict aeroelastic phenomena like flutter accurately. The improved BEM model is coupled with detailed structural dynamic models to simulate blade responses under various loading conditions. Validation against high-fidelity Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) data demonstrates the model's superior accuracy, with deviations primarily near the blade tips due to complex flow dynamics and structural behaviors. The results highlight the model's capability to closely match CFD and FEA predictions, affirming its reliability. Key findings reveal that the improved coupled BEM model provides precise aeroelastic predictions, crucial for the safety and performance optimization of biplane wind turbines. Compared to traditional BEM methods, the improved model reduces prediction errors by approximately 50%, while showing deviations of less than 3-5% from CFD results. The research significantly advances the understanding of biplane blade dynamics, informing the design and optimization of next-generation wind turbines. Future work will focus on model refinement, extensive experimental validation, and the exploration of advanced control strategies for load alleviation and flutter suppression. This study paves the way for developing more efficient, reliable, and sustainable wind energy systems, contributing to the global transition towards renewable energy sources.
Recommended Citation
Atique, Md Saifuddin Ahmed, "Aeroelasticity Investigation Of Biplane Wind Turbine Blade" (2025). Theses and Dissertations. 7094.
https://commons.und.edu/theses/7094