Cargando…
Nature’s Wind Turbines: The Measured Aerodynamic Efficiency of Spinning Seeds Approaches Theoretical Limits
This paper describe a procedure to measure experimentally the power coefficient, [Formula: see text] , of winged seeds, and apply this technique to seeds from the Norway maple (Acer platanoides). We measure [Formula: see text] at a tip speed ratio of [Formula: see text]. Our results are in agreement...
Autor principal: | |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9589966/ https://www.ncbi.nlm.nih.gov/pubmed/36278718 http://dx.doi.org/10.3390/biomimetics7040161 |
_version_ | 1784814410388209664 |
---|---|
author | Molteno, Timothy C. A. |
author_facet | Molteno, Timothy C. A. |
author_sort | Molteno, Timothy C. A. |
collection | PubMed |
description | This paper describe a procedure to measure experimentally the power coefficient, [Formula: see text] , of winged seeds, and apply this technique to seeds from the Norway maple (Acer platanoides). We measure [Formula: see text] at a tip speed ratio of [Formula: see text]. Our results are in agreement with previously published CFD simulations that indicate that these seeds—operating in low-Reynolds number conditions—approach the Betz limit ([Formula: see text]) the maximum possible efficiency for a wind turbine. In addition, this result is not consistent with the recent theoretical work of Okulov & Sørensen, which suggests that a single-bladed turbine with a tip-speed ratio of 3.2 can achieve a power efficiency of no more than 30%. |
format | Online Article Text |
id | pubmed-9589966 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-95899662022-10-25 Nature’s Wind Turbines: The Measured Aerodynamic Efficiency of Spinning Seeds Approaches Theoretical Limits Molteno, Timothy C. A. Biomimetics (Basel) Article This paper describe a procedure to measure experimentally the power coefficient, [Formula: see text] , of winged seeds, and apply this technique to seeds from the Norway maple (Acer platanoides). We measure [Formula: see text] at a tip speed ratio of [Formula: see text]. Our results are in agreement with previously published CFD simulations that indicate that these seeds—operating in low-Reynolds number conditions—approach the Betz limit ([Formula: see text]) the maximum possible efficiency for a wind turbine. In addition, this result is not consistent with the recent theoretical work of Okulov & Sørensen, which suggests that a single-bladed turbine with a tip-speed ratio of 3.2 can achieve a power efficiency of no more than 30%. MDPI 2022-10-12 /pmc/articles/PMC9589966/ /pubmed/36278718 http://dx.doi.org/10.3390/biomimetics7040161 Text en © 2022 by the author. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Molteno, Timothy C. A. Nature’s Wind Turbines: The Measured Aerodynamic Efficiency of Spinning Seeds Approaches Theoretical Limits |
title | Nature’s Wind Turbines: The Measured Aerodynamic Efficiency of Spinning Seeds Approaches Theoretical Limits |
title_full | Nature’s Wind Turbines: The Measured Aerodynamic Efficiency of Spinning Seeds Approaches Theoretical Limits |
title_fullStr | Nature’s Wind Turbines: The Measured Aerodynamic Efficiency of Spinning Seeds Approaches Theoretical Limits |
title_full_unstemmed | Nature’s Wind Turbines: The Measured Aerodynamic Efficiency of Spinning Seeds Approaches Theoretical Limits |
title_short | Nature’s Wind Turbines: The Measured Aerodynamic Efficiency of Spinning Seeds Approaches Theoretical Limits |
title_sort | nature’s wind turbines: the measured aerodynamic efficiency of spinning seeds approaches theoretical limits |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9589966/ https://www.ncbi.nlm.nih.gov/pubmed/36278718 http://dx.doi.org/10.3390/biomimetics7040161 |
work_keys_str_mv | AT moltenotimothyca natureswindturbinesthemeasuredaerodynamicefficiencyofspinningseedsapproachestheoreticallimits |