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On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight

We study the role of unsteady lift in the context of flapping wing bird flight. Both aerodynamicists and biologists have attempted to address this subject, yet it seems that the contribution of unsteady lift still holds many open questions. The current study deals with the estimation of unsteady aer...

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Autores principales: Stalnov, Oksana, Ben-Gida, Hadar, Kirchhefer, Adam J., Guglielmo, Christopher G., Kopp, Gregory A., Liberzon, Alexander, Gurka, Roi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4579066/
https://www.ncbi.nlm.nih.gov/pubmed/26394213
http://dx.doi.org/10.1371/journal.pone.0134582
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author Stalnov, Oksana
Ben-Gida, Hadar
Kirchhefer, Adam J.
Guglielmo, Christopher G.
Kopp, Gregory A.
Liberzon, Alexander
Gurka, Roi
author_facet Stalnov, Oksana
Ben-Gida, Hadar
Kirchhefer, Adam J.
Guglielmo, Christopher G.
Kopp, Gregory A.
Liberzon, Alexander
Gurka, Roi
author_sort Stalnov, Oksana
collection PubMed
description We study the role of unsteady lift in the context of flapping wing bird flight. Both aerodynamicists and biologists have attempted to address this subject, yet it seems that the contribution of unsteady lift still holds many open questions. The current study deals with the estimation of unsteady aerodynamic forces on a freely flying bird through analysis of wingbeat kinematics and near wake flow measurements using time resolved particle image velocimetry. The aerodynamic forces are obtained through two approaches, the unsteady thin airfoil theory and using the momentum equation for viscous flows. The unsteady lift is comprised of circulatory and non-circulatory components. Both approaches are presented over the duration of wingbeat cycles. Using long-time sampling data, several wingbeat cycles have been analyzed in order to cover both the downstroke and upstroke phases. It appears that the unsteady lift varies over the wingbeat cycle emphasizing its contribution to the total lift and its role in power estimations. It is suggested that the circulatory lift component cannot assumed to be negligible and should be considered when estimating lift or power of birds in flapping motion.
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spelling pubmed-45790662015-10-01 On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight Stalnov, Oksana Ben-Gida, Hadar Kirchhefer, Adam J. Guglielmo, Christopher G. Kopp, Gregory A. Liberzon, Alexander Gurka, Roi PLoS One Research Article We study the role of unsteady lift in the context of flapping wing bird flight. Both aerodynamicists and biologists have attempted to address this subject, yet it seems that the contribution of unsteady lift still holds many open questions. The current study deals with the estimation of unsteady aerodynamic forces on a freely flying bird through analysis of wingbeat kinematics and near wake flow measurements using time resolved particle image velocimetry. The aerodynamic forces are obtained through two approaches, the unsteady thin airfoil theory and using the momentum equation for viscous flows. The unsteady lift is comprised of circulatory and non-circulatory components. Both approaches are presented over the duration of wingbeat cycles. Using long-time sampling data, several wingbeat cycles have been analyzed in order to cover both the downstroke and upstroke phases. It appears that the unsteady lift varies over the wingbeat cycle emphasizing its contribution to the total lift and its role in power estimations. It is suggested that the circulatory lift component cannot assumed to be negligible and should be considered when estimating lift or power of birds in flapping motion. Public Library of Science 2015-09-22 /pmc/articles/PMC4579066/ /pubmed/26394213 http://dx.doi.org/10.1371/journal.pone.0134582 Text en © 2015 Stalnov et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Stalnov, Oksana
Ben-Gida, Hadar
Kirchhefer, Adam J.
Guglielmo, Christopher G.
Kopp, Gregory A.
Liberzon, Alexander
Gurka, Roi
On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight
title On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight
title_full On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight
title_fullStr On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight
title_full_unstemmed On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight
title_short On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight
title_sort on the estimation of time dependent lift of a european starling (sturnus vulgaris) during flapping flight
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4579066/
https://www.ncbi.nlm.nih.gov/pubmed/26394213
http://dx.doi.org/10.1371/journal.pone.0134582
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