Performance analysis of an idealized Darrieus–Savonius combined vertical axis wind turbine

Jingna Pan*, Carlos Ferreira, Alexander van Zuijlen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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To investigate the effect of force distributions of each turbine component on the power performance of the Darrieus–Savonius combined vertical axis wind turbine (hybrid VAWT), the hybrid VAWT is modeled as idealized turbine under various force distributions. The goal of idealization is to simplify the intricate interactions between the Savonius and Darrieus components. The simulation actuator surfaces with uniform force distributions lead to a cost-effective way to identify the optimal force distribution of each turbine component. The numerical model was validated against momentum theory. The results demonstrated that the numerical and theoretical results yield similar predictions in the low-thrust cases but show differences in the high-thrust cases. The maximum power coefficient (Formula presented.) of an idealized hybrid VAWT with given thrust coefficient (Formula presented.) is lower than that of a single actuator. This is a consequence of the nonoptimal loading on the actuator. The results indicate that an idealized hybrid VAWT does not show a significant power increase compared with an optimal single Darrieus rotor. Therefore, the presence of a Savonius rotor inside a Darrieus rotor leads to a lower power output in any circumstance. The hybrid configuration is primarily advantageous for the start-up performance of the combined rotor, which is not explored in this study.

Original languageEnglish
Number of pages16
JournalWind Energy
Publication statusPublished - 2024


  • actuator-disk-in-cylinder model
  • Darrieus–Savonius combined vertical axis wind turbine (hybrid VAWT)
  • power performance
  • uniform force distribution


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