Wind and Structures

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Chaotic vibration characteristics of Vertical Axis Wind Turbine (VAWT) shaft system

  • C.B. Maheswaran (Turbulence and Flow Control Lab, School of Mechanical Engineering, SASTRA Deemed University) ;
  • R. Gopal (Centre for Nonlinear Science & Engineering, School of Electrical & Electronics Engineering, SASTRA Deemed University) ;
  • V.K. Chandrasekar (Centre for Nonlinear Science & Engineering, School of Electrical & Electronics Engineering, SASTRA Deemed University) ;
  • S. Nadaraja Pillai (Turbulence and Flow Control Lab, School of Mechanical Engineering, SASTRA Deemed University)
  • Received : 2021.06.05
  • Accepted : 2023.03.23
  • Published : 2023.03.25
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Abstract

We study the progressive full-scale wind tunnel tests on a high solidity vertical axis wind turbine (VAWT) for various tip speeds and pitch angles to understand the VAWT shaft system's dynamics using 0-1 Test for chaos. We identify that while varying rotor speed (tip speed) of the turbine, the system's dynamics change from periodic to chaotic through quasiperiodic and strange non-chaotic (SNA) states. The present study is the first experimental evidence for the existence of these states in the VAWT shaft system to the best of our knowledge. Using the asymptotic growth value Kc in 0-1 test, when the turbine operates at the low tip speeds and high pitch angles for low incoming wind speeds, the system behaves periodic (Kc ≈ 0). However, when the incoming wind speed increases further the system's dynamics shift from periodic to chaotic vibrations through quasi-periodic and SNA. This phenomenon is due to the dynamic stalling of blades which induces chaotic vibration in the VAWT shaft system. Further, the singular continuous spectrum method validates the presence of SNA and differentiates the SNA from chaotic vibrations.

Keywords

Acknowledgement

This research work was supported by the Science Engineering Research Board (SERB), Department of Science & Technology (DST), Government of India, File No: CRG/2021/005720.

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