Particle image velocimetry measurements of the wake of freely flying birds
Abstract/Contents
- Abstract
- This work focuses on better understanding the vortex wake, such as vortex break up and calculated weight support, of a slowly flying bird in undisturbed still air. The wake behind a pacific parrotlet flying at speeds between 1.5 and 2 m/s was measured in still air using stereo Particle Image Velocimetry (PIV). The bird was trained to fly between perches through the laser sheet while the bird was wearing laser safety goggles, specifically designed for the parrotlet. The measured wingtip vortices advected down and broke up relatively quickly, contradicting the frozen turbulence hypothesis typically assumed in wind tunnel flight experiments. The instantaneous lift was estimated based on the velocity field with the commonly used Kutta-Joukowski theorem, vortex ring model, and actuator disk model. The calculated lift was found to be sensitive to the applied model and different parameters in the models, including vortex span and time of measurement-rendering these accepted ways of calculating weight support inconsistent.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2016 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Gutierrez, Eric |
|---|---|
| Associated with | Stanford University, Department of Aeronautics and Astronautics. |
| Advisor | Lentink, David, 1975- |
| Thesis advisor | Lentink, David, 1975- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Eric Gutierrez. |
|---|---|
| Note | Submitted to the Department of Aeronautics and Astronautics. |
| Thesis | Thesis (Engineering)--Stanford University, 2016. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2016 by Eric Gutierrez
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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