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Flutter instability in an internal flow energy harvester

Tosi, Luis Phillipe and Dorschner, Benedikt and Colonius, Tim (2021) Flutter instability in an internal flow energy harvester. Journal of Fluid Mechanics, 915 . Art. No. A40. ISSN 0022-1120. doi:10.1017/jfm.2021.18.

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Vibration-based flow energy harvesting enables robust, in situ energy extraction for low-power applications, such as distributed sensor networks. Fluid–structure instabilities dictate a harvester's viability since the structural response to the flow determines its power output. Previous work on a flextensional based flow energy harvester demonstrated that an elastic member within a converging-diverging channel is susceptible to the aeroelastic flutter. This work explores the mechanism driving flutter through experiments and simulations. A model is then developed based on channel flow rate modulation and considering the effects of both normal and spanwise flow confinement on the instability. Linear stability analysis of the model replicates flutter onset, critical frequency and mode shapes observed in experiments. The model suggests that flow modulation through the channel throat is the principal mechanism for the fluid-induced vibration. The generalized model presented can serve as the foundation of design parameter exploration for energy harvesters, perhaps leading to more powerful devices in the future, but also to other similar flow geometries where the flutter instability arises in an elastic member within a narrow flow passage.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Tosi, Luis Phillipe0000-0002-0819-4765
Dorschner, Benedikt0000-0001-8926-7542
Colonius, Tim0000-0003-0326-3909
Additional Information:© The Author(s), 2021. Published by Cambridge University Press. Received 8 May 2020; revised 5 October 2020; accepted 29 December 2020. Published online by Cambridge University Press: 12 March 2021. The authors would like to acknowledge the help, insight and facilities support of S. Sherrit, H.J. Lee and Y. Bar-Cohen at the Jet Propulsion Laboratory. Funding: We would like to acknowledge Bosch Energy Research Network (BERN) grant 13.01.CC17, the Stanback Space Innovation Program and the NASA Jet Propulsion Laboratory for their support of this research. B.D. also gratefully acknowledges the support of SNF under the grant no. P2EZP2_178436. The authors report no conflict of interest.
Funding AgencyGrant Number
Bosch Energy Research Network13.01.CC17
Stanback Space Innovation ProgramUNSPECIFIED
Swiss National Science Foundation (SNSF)P2EZP2_178436
Subject Keywords:flow–structure interactions
Record Number:CaltechAUTHORS:20201109-084732116
Persistent URL:
Official Citation:Tosi, L., Dorschner, B., & Colonius, T. (2021). Flutter instability in an internal flow energy harvester. Journal of Fluid Mechanics, 915, A40. doi:10.1017/jfm.2021.18
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106503
Deposited By: Tony Diaz
Deposited On:09 Nov 2020 17:09
Last Modified:15 Apr 2021 19:13

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