Journal article · Conference paper
Optimal Aero-Elastic Design of a Rotor with Bend-Twist Coupling
Department of Wind Energy, Technical University of Denmark1
Aerodynamic design, Department of Wind Energy, Technical University of Denmark2
Wind turbine loads & control, Department of Wind Energy, Technical University of Denmark3
Fluid Mechanics, Department of Wind Energy, Technical University of Denmark4
Passive Bend-Twist Coupling (BTC) can be used in blades to alleviate loads and generate more Annual Energy Production (AEP). However, BTC is inherently aero-elastic, thus difficult to incorporate into the design with sequential design process. Multi-disciplinary Design Optimization (MDO) is an attractive approach for overcoming these challenges.
This paper presents the re-design of a 100kW BTC rotor using the MDO rotor design package HAWTOpt2. In the preliminary design phase, MDO was used to assess the differences between elastic BTC (i.e. off-axis fibers) and geometric BTC (i.e. sweep). This work found that aero-elastic design optimization without BTC was able to achieve a 16% improvement, then with sweep a 18% improvement and with material coupling a 17% improvement.
Due to the reduced stiffness of off-axis fibers, material coupled designs had more difficulty satisfying the tip deflection constraint. The geometric BTC concept was chosen for the final design. The design optimization was repeated with additional manufacturing constraints. The final design achieved a 12% improvement.
| Language: | English |
|---|---|
| Publisher: | IOP Publishing |
| Year: | 2018 |
| Pages: | 042009 |
| Proceedings: | The Science of Making Torque from Wind 2018 |
| ISSN: | 17426596 and 17426588 |
| Types: | Journal article and Conference paper |
| DOI: | 10.1088/1742-6596/1037/4/042009 |
| ORCIDs: | Zahle, Frederik , Dicholkar, Antariksh Chandrashekhar , Verelst, David Robert and Kim, Taeseong |
