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Research Report 1 : Penguin flipper hydrodynamics

Walsum, T.A. van (2014) Research Report 1 : Penguin flipper hydrodynamics. Master's Thesis / Essay, Biology.

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Leading Edge Vortices are a part of unsteady hydrodynamics, they allow an increase in lift and postpone stall effects. A recent study discovered LEV formation in swifts (Apus apus),broadening the possibilities for LEVs to be present in other birds as well. A self-designed downscaled Adélie penguin flipper (base hydrofoil: NACA 63-018) was tested in a rotating system at three base velocities. The flipper was tested at angles of attack ranging from 0 C up to 32.5 C (with steps of 2.5 C). PIVlab analysis allowed calculation of the particle displacement (vector analysis), created by the Adélie penguin flipper. Further analysis provided circulation around the penguin flipper at every angle of attack and base rotation velocity. Our data reveals the presence of LEVs. The LEVs increased the Adélies’ lift up to a maximum of 3.64. This is a significant increase in lift coefficient compared to expected lift value of a 2D model NACA 63-018 profile (CL max 1.20). Our increase in lift coefficient is non-linear to angle of attack and steeper than Javafoil’s expected values. We conclude that our downscaled Adélie penguin flipper depicts the presence of LEV lift enhancement during rotational flight.

Item Type: Thesis (Master's Thesis / Essay)
Supervisor name: xx, xx
Degree programme: Biology
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:58
Last Modified: 02 May 2019 07:29

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