dc.identifier.uri |
http://dx.doi.org/10.15488/9373 |
|
dc.identifier.uri |
https://www.repo.uni-hannover.de/handle/123456789/9427 |
|
dc.contributor.advisor |
Scholz, Dieter |
DE |
dc.contributor.author |
Desenfans, Philip
|
ger |
dc.date.accessioned |
2020-02-17T11:05:03Z |
|
dc.date.issued |
2019 |
|
dc.identifier.citation |
Desenfans, Philip: Aerodynamics of the Maple Seed. Project. Hamburg : Aircraft Design and Systems Group (AERO), Department of Automotive and Aeronautical Engineering, Hamburg University of Applied Sciences, 2019. URN: https://nbn-resolving.org/urn:nbn:de:gbv:18302-aero2019-06-01.016 |
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dc.description.abstract |
Purpose - The paper presents a theoretical framework that describes the aerodynamics of a falling maple (Acer pseudoplatanus) seed. --- Methodology - A semi-empirical method is developed that provides a ratio stating how much longer a seed falls in air compared to freefall. The generated lift is calculated by evaluating the integral of two-dimensional airfoil elements using a preliminary falling speed. This allows for the calculation of the definitive falling speed using Blade Element Momentum Theory (BEMT); hereafter, the fall duration in air and in freefall are obtained. Furthermore, the input-variables of the calculation of lift are transformed to require only the length and width of the maple seed. Lastly, the method is applied to two calculation examples as a means of validation. --- Findings - The two example calculations gave percentual errors of 5.5% and 3.7% for the falling speed when compared to measured values. The averaged result is that a maple seed falls 9.9 times longer in air when released from 20 m; however, this result is highly dependent on geo-metrical parameters which can be accounted for using the constructed method. --- Research limitations - Firstly, the coefficient of lift is unknown for the shape of a maple seed. Secondly, the approximated transient state is yet to be verified by measurement. --- Originality / Value - The added value of this report lies in the reduction of simplifications compared to BEMT approaches. In this way a large amount of accuracy is achieved due to the inclusion of many geometrical parameters, even though simplicity is maintained. This has been accomplished through constructing a simple three-step method that is fundamental and essen-tially non-iterative. |
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dc.language.iso |
eng |
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dc.publisher |
Hamburg : Aircraft Design and Systems Group (AERO), Department of Automotive and Aeronautical Engineering, Hamburg University of Applied Sciences |
|
dc.rights |
CC BY-NC-SA 4.0 Unported |
ger |
dc.rights.uri |
https://creativecommons.org/licenses/by-nc-sa/4.0 |
ger |
dc.subject |
Blade Element Momentum Theory |
eng |
dc.subject |
BEMT |
eng |
dc.subject |
free fall |
eng |
dc.subject |
post-stall |
eng |
dc.subject |
chord |
eng |
dc.subject |
twist |
eng |
dc.subject |
camber |
eng |
dc.subject |
autorotation |
eng |
dc.subject.classification |
Aerodynamik |
ger |
dc.subject.classification |
Ahorn |
ger |
dc.subject.classification |
Auftrieb |
ger |
dc.subject.classification |
Strömungsabriss |
ger |
dc.subject.classification |
Aerodynamisches Profil |
ger |
dc.subject.classification |
Anstellwinkel |
ger |
dc.subject.classification |
Freier Fall |
ger |
dc.subject.classification |
Bergahorn |
ger |
dc.subject.classification |
Samen |
ger |
dc.subject.classification |
Evolutionsbiologie |
ger |
dc.subject.ddc |
600 | Technik
|
ger |
dc.subject.ddc |
620 | Ingenieurwissenschaften und Maschinenbau
|
ger |
dc.subject.ddc |
629,1 | Luft- und Raumfahrttechnik
|
ger |
dc.subject.lcsh |
Aerodynamics |
eng |
dc.subject.lcsh |
Maple |
eng |
dc.subject.lcsh |
Lift (Aerodynamics) |
eng |
dc.subject.lcsh |
Stalling (Aerodynamics) |
eng |
dc.subject.lcsh |
Aerofoils |
eng |
dc.subject.lcsh |
Angle of attack (Aerodynamics) |
eng |
dc.subject.lcsh |
Acer pseudoplatanus |
eng |
dc.subject.lcsh |
Seeds |
eng |
dc.subject.lcsh |
Evolution (Biology) |
eng |
dc.title |
Aerodynamics of the Maple Seed |
eng |
dc.type |
Book |
ger |
dc.type |
Text |
ger |
dc.relation.urn |
https://nbn-resolving.org/urn:nbn:de:gbv:18302-aero2019-06-01.016 |
|
dc.relation.other |
https://n2t.net/ark:/13960/t4fn9pt5b |
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dc.description.version |
publishedVersion |
ger |
tib.accessRights |
frei zug�nglich |
ger |