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Shape-morphing membranes augment the performance of oscillating foil energy harvesting turbines

Ilan M. L. Upfal*, Yuanhang Zhu†, Eric Handy-Cardenas, and Kenneth Breuer

  • Center for Fluid Mechanics, School of Engineering, Brown University, 184 Hope St, Providence, Rhode Island 02912, USA

  • *Contact author: iupfal@mit.edu
  • †Present address: University of California, Riverside.
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Phys. Rev. Fluids 10, 034702 – Published 20 March, 2025

DOI: https://doi.org/10.1103/PhysRevFluids.10.034702

Abstract

Oscillating foil turbines (OFTs) can be used to produce power from rivers and tides by synchronizing their heaving motion with the strong lift force of vortices shed at their leading edge. Prior work has shown that compliant membrane OFTs, which passively camber, exhibit enhanced leading edge vortex (LEV) stability and improved lift and power compared with rigid foil OFTs for specific kinematics. This work seeks to understand (a) the performance of compliant membrane OFTs over their full kinematic parameter space and (b) separate the roles of membrane camber and extensibility in LEV stabilization. We characterize the performance of a compliant membrane OFT over a wide range of kinematic parameters through prescribed motion experiments in a free-surface water flume. The optimal frequency of the compliant membrane OFT is found to be lower than that of a rigid foil OFT due to the enhanced LEV stability of the membrane. The lift and power of compliant and inextensible membrane foils are then compared to determine whether camber alone is effective for LEV stabilization or if extensibility plays an important stabilizing role. The deformation of the compliant membrane OFT is measured using laser imaging. We observe that the role of extensibility changes for different angles of attack. At low angles of attack, membrane deformation is consistent through the half cycle coinciding with similar performance to the inextensible foil. At higher angles of attack, the compliant foil has a larger deformation and dynamically decambers corresponding with delayed stall and enhanced lift and power.

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Phys. Rev. Fluids 10, 034702– Published 20 March, 2025
  • Received 18 July 2024
  • Accepted 23 January 2025
Article part of CHORUS
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