Miniature water flow energy harvester based on Savonius-type microturbine: an experimental study
File(s)Lepipas_2024_Smart_Mater._Struct._33_025019.pdf (2.2 MB)
Published version
Author(s)
Lepipas, Georgios
Holmes, Andrew S
Type
Journal Article
Abstract
In this experimental study, a miniature turbine-based water flow energy harvester designed for the purpose of providing power to wireless sensors within water pipes is reported. The device comprises a Savonius-type turbine and a radial flux permanent magnet electromagnetic generator. The two are magnetically coupled so that, while the turbine is submerged in the water flow, the generator operates in air. The device is cylindrical with a diameter of 0.8 cm and a length of 7.2 cm and, when inserted through a hole in a pipe wall so that only the turbine protrudes into the flow, it presents a cross-sectional area to the flow of only 1.25 cm2. Manufacturing was achieved through a blend of conventional machining methods, laser cutting, rapid prototyping, and the utilization of flexible printed circuit board technology for the generator stator. To ensure low friction and minimize cut in speed, ceramic ball bearings were employed. The prototype can function effectively at water velocities as low as 0.5 m s−1, generating electrical power within the range of 125 µW–5.1 mW when subjected to flow speeds between 0.5 and 2 m s−1. A maximum overall efficiency of 2.2% is achieved, when the water speed is 0.8 m s−1. Performance curves derived from experimental testing of the turbine for a range of rotor designs, obtained on a water flow rig, are presented and discussed.
Date Issued
2024-02
Date Acceptance
2024-01-08
Citation
Smart Materials and Structures, 2024, 33 (2)
ISSN
0964-1726
Publisher
IOP Publishing
Journal / Book Title
Smart Materials and Structures
Volume
33
Issue
2
Copyright Statement
© 2024 The Author(s). Published by IOP Publishing Ltd Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Identifier
http://dx.doi.org/10.1088/1361-665x/ad1c3f
Publication Status
Published
Article Number
025019
Date Publish Online
2024-01-19