Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Behavior of pop up feathers during flow separation.
KTH, School of Engineering Sciences (SCI), Mechanics.
2014 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Birds are products of millions of years of evolution. Thus, many characteristics of their bodies and wings are designed to make bird flight easier and more effective. One such interesting characteristic of many birds is the presence of a passive appendage on the wing in the form of feathers that pop up during landing or turbulent circumstances. In this paper an attempt is made to describe the behavior of these popped up feathers and its effect on the lift during flow separation with a simple inverted pendulum model (1). This is done by applying the model to a two dimensional airfoil with a wing-flap attached to its upper surface to reproduce the relevant geometry of the bird wing with pop up feathers. Two cases for how the wing-flap is attached to the airfoil are investigated, one where the wing-flap is hinged to the airfoil and one where the wing-flap is attached to the airfoil with a torsion spring. First the theory behind the model is explained followed by an analysis of how this model is applied to the airfoil and wing flap configuration. The optimal wing-flap configurations are then calculated numerically and compared to lift data of the pure airfoil. Since the model is a simplification of the complex interaction between the wing-flap and the fluid flow, the results are expected to be modest. It was found that the optimal wing-flap configurations increased lift with about 4.4% and 5% for the hinge-joint and torsion spring case respectively.

Place, publisher, year, edition, pages
2014. , 22 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-149312OAI: oai:DiVA.org:kth-149312DiVA: diva2:738938
Supervisors
Available from: 2014-08-19 Created: 2014-08-19 Last updated: 2014-10-16Bibliographically approved

Open Access in DiVA

Varuna Dharmadasa kandidatexamensarbete.(1016 kB)173 downloads
File information
File name FULLTEXT01.pdfFile size 1016 kBChecksum SHA-512
8bc2d72cb812ae77ebc8f14f3875aa41b79da4a663c88513f94763899c9c51e2286671183905043896261911089f41610e52235d6a223560de6c9fc861ce5330
Type fulltextMimetype application/pdf

By organisation
Mechanics
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 173 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 247 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf