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Aerodynamics of Insect Flight: Effects of wind gusts on a rigid flapping NACA 0012 airfoil at Re = 3000
KTH, School of Engineering Sciences (SCI), Mechanics.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Insects and small flyers operate at Reynolds numbers ranging from approximately 10-105 , where viscous forces are important. Due to their small size and weight, they are sensitive to small changes in the free stream during flight, such as wind gusts. First, the aerodynamics of flapping flight is briey explained. Then the lift, drag and power usage for a flapping NACA 0012 airfoil is simulated in ANSYS Fluent for different oncoming wind directions. The aim of the report is to understand how the pitching amplitude, the apping frequency and the plunging amplitude can be adjusted to compensate for oncoming wind gusts. The simulation is modelled as quasistatic since the time scale of the flapping wings of the insect is much shorter than the time scale of the wind gusts.

Abstract [sv]

Insekter och andra små flygande djur flyger vid låga Reynolds tal som sträcker sig från cirka 10-100 000. Det medför att viskösa krafter är viktiga. På grund av sin ringa storlek och vikt är de känsliga för små förändringar i den friströmmen under flygningen, till exempel vindbyar. Först förklaras teorin bakom aerodynamiken vid flaxande flygning. Sedan simuleras lyftkraft, dragkraft och effektförbrukning för en flaxande NACA 0012 vingprofil vid olika riktningar på friströmmen med hjälp av ANSYS Fluent. Syftet med rapporten är att förstå hur pitching-amplitud, vingslagsfrekvens och vingslagsamplitud kan justeras för att kompensera för inkommande vindbyar. Simuleringen modelleras som kvasistatisk eftersom tidsskalan hos insekters flaxande vingar normalt är mycket kortare än tidsskalan hos vindbyar.

Place, publisher, year, edition, pages
2015. , 27 p.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-167123OAI: oai:DiVA.org:kth-167123DiVA: diva2:813085
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Examiners
Available from: 2015-05-21 Created: 2015-05-21 Last updated: 2015-05-21Bibliographically approved

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CiteExportLink to record
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  • apa
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