Influence of phase-shift and overlap ratio on savonius wind turbine's performance

Jian Chen, Kumbernuss Jan, Linhua Zhang, Lin Lu, Hongxing Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

43 Citations (Scopus)


This paper presents the experimental results of the vertical axis wind turbine (VAWT), especially the Savonius rotors, which are developed for application on top of buildings due to lower wind speed compared with remote areas. The VAWT is regarded as the most suitable elegant candidate to be integrated with buildings for its relatively low operating noise, easy maintenance, and easy access. This study explored the interaction effect of the overlap ratio, phase-shift, and stage on the performance of the Savonius rotors in details. The results show that appropriate choice of the phase-shift angle according to the overlap ratio can not only increase the power coefficient of the Savonius rotors but also eliminate the negative static torque and smooth the variation of the static torque coefficient. Moreover, the performance of the two-stage rotors indicates that the two-stage rotor is the best candidate for this type of wind turbines or as a starting assistant for the Darrieus rotors.
Original languageEnglish
Article number011016
JournalJournal of Solar Energy Engineering, Transactions of the ASME
Issue number1
Publication statusPublished - 1 Jan 2012


  • overlap ratio
  • phase-shift angle
  • power coefficient
  • Savonius wind rotor
  • static torque coefficient

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology


Dive into the research topics of 'Influence of phase-shift and overlap ratio on savonius wind turbine's performance'. Together they form a unique fingerprint.

Cite this