Effect of surface roughness on drag of loggerhead carapace
The present investigation prim arily studies the effect of surface roughness on the drag coefficient, Cd of a Loggerhead sea turtle carapace using a subsonic wind tunnel. The pressure coefficient, Cp distribution across the Loggerhead carapace was also investigated...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
2008
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| Subjects: | |
| Online Access: | http://eprints.utm.my/id/eprint/18865/1/IskandarShahIshak2008_EFFECT%20OF%20SURFACE%20ROUGHNESS%20ON%20DRAG.pdf http://eprints.utm.my/id/eprint/18865/ http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.490.2302&rep=rep1&type=pdf |
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| Summary: | The present investigation prim
arily studies the effect of surface roughness on the
drag coefficient, Cd of a Loggerhead sea turtle carapace using a subsonic wind
tunnel. The pressure coefficient, Cp distribution across the Loggerhead carapace
was also investigated and is compared to
the Cp trend of an airfoil in order to
deduce the aerodynamics features of the
Loggerhead carapace. One-to-five-scaled
models are created based on the dimensions of a real Loggerhead turtle with
simplification. Four roughness scales were
employed to capture the Cd trend at
increasing Reynolds numbers, Re. As expected, the Cd levelled off with Re for all
four models investigated. However, the Re
where constant Cd began varies with
relative roughness of the carapace models. Good correlation between the Cd and
relative roughness is obtained. In addition, the wind tunnel results are able to
capture the Cp trend of the carapace models and compared to Cp values of an
airfoil. Results reveal that the upper surface of the Loggerhead carapace is
streamlined but with restrictions of angle of attack. |
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