Experimental investigation of leading-edge tubercles on the performance of an optimized H-type Darrieus wind turbine under dynamic and static cases
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS, cilt.94, ss.1-11, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 94
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.seta.2026.105434
- Dergi Adı: SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
- Derginin Tarandığı İndeksler: Scopus, Science Citation Index Expanded (SCI-EXPANDED), Compendex, Geobase, INSPEC
- Sayfa Sayıları: ss.1-11
- Karadeniz Teknik Üniversitesi Adresli: Evet
Özet
This study investigated the effect of leading-edge (LE) tubercles on the H-type Darrieus wind turbine in an optimized rotor configuration. Experiments were performed in a blowing-type wind tunnel with a closed test section for a 3-bladed rotor under dynamic and static cases. Firstly, the optimal turbine configuration was determined through an evaluation of the rotor aspect ratio (H/D) and blade pitch angle (β). Overall, H/D = 1.0 was identified as the most favorable rotor configuration across the investigated blade pitch angles. The ideal β was obtained at − 6◦ for all three tested different constant rotational speeds when H/D = 1.0. Next, the variation in the power coefficient was investigated by testing blades with LE tubercles at 150 rpm, 200 rpm, and 250 rpm under the optimal rotor configuration (H/D = 1.0 and β = − 6◦). At 150 rpm, the W2 model showed a 16.7% improvement compared to the baseline, while the improvement in the power performance due to the blades with LE tubercles gradually reduces at higher rotational speeds. However, the W4 model underperformed regardless of rotational speed. In general, tubercle amplitude was found to be the dominant parameter in improving power performance, while shorter wavelengths were effective when combined with lower amplitudes. The static torque analysis indicated that β = − 6◦ enhances self-starting capability by reducing torque ripple intensity (TRI) and maintaining predominantly positive torque over the azimuth angle range compared to β = 0◦ at both 4 m/s and 6 m/s. Furthermore, the findings indicated that the LE tubercles improved torque stability, with the extent of improvement depending on wind speed.