Influence of Renolds number on generation and decay of aircraft wakes: Experimental investigation using generic models, F13 and F13X
Carmer, Carl F. v. and Konrath, Robert (2007) Influence of Renolds number on generation and decay of aircraft wakes: Experimental investigation using generic models, F13 and F13X. DLR-Interner Bericht. DLR-IB 224-2006 A 29, 31 S.
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The development of multiple-vortex wake systems in the far field of a generic aircraft model is assessed by evaluation of experimental data obtained from MonoPIV measurements in the large towing tank facility of the Hamburg Ship Model Basin (HSVA). In the selected experimental configurations DLR's F13X vortex generator has been operated at two geometrical configurations for three different chord-based Reynolds numbers. From the tips of the rectangular main wing a 2-vortex system shed off, and adding a horizontal tail plane to the vortex generator produced a 4-vortex system of two unequal-strength counter-rotating vortex pairs. The 2-vortex systems showed a gradual decay, its characteristic parameters have been evaluated well into the wake far field up to vortex ages of 4.5 without providing any evidence for cooperative long-wavelength instabilities. Contrarily, for the same Re<sub>c</sub> the counter-rotating vortex pairs of the 4-vortex systems underwent short-wavelength instabilities in the extended near field leading to a strong vortex interaction and rapid threedimensional reorganization. After the 'catastrophic event' only a weak 2-vortex systemremained that gradually decayed. Comparing the development of different 2-vortex systems in the given range of Re<sub>c</sub>, the behavior in the far field is Re<sub>c</sub> invariant. Also for the 4-vortex systems no distinct indication has been found for a significant Re<sub>c</sub> dependance.
|Document Type:||Monograph (DLR-Interner Bericht)|
|Title:||Influence of Renolds number on generation and decay of aircraft wakes: Experimental investigation using generic models, F13 and F13X|
|In ISI Web of Science:||No|
|Number of Pages:||31|
|Keywords:||wake vortex system, aircraft wake, Reynolds dependance, water towing tank|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L AR - Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Flight Physics|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Experimental Methods|
|Deposited By:||Ilka Micknaus|
|Deposited On:||06 Mar 2007|
|Last Modified:||27 Apr 2009 13:27|
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