Theiß, Alexander und Leyh, Sascha und Hein, Stefan (2017) Pressure gradient effects on wake flow instabilities behind isolated roughness elements on re-entry capsules. 7TH EUROPEAN CONFERENCE FOR AERONAUTICS AND AEROSPACE SCIENCES (EUCASS), 2017-07-03 - 2017-07-06, Mailand, Italien.
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Offizielle URL: http://www.eucass2017.eu/
Kurzfassung
Laminar-turbulent transition caused by modal disturbance growth in the wake flow of isolated roughness elements on blunt re-entry capsules is studied numerically at typical cold hypersonic wind tunnel conditions. Two fundamentally different heat shield shapes are considered. On the sphere-cone forebody the wake flow of the roughness is exposed to an adverse pressure gradient, whereas the spherical heat shield exhibits a strongly favourable pressure gradient. The pressure gradient effects on the development of the stationary wake flow and its modal instability characteristics are discussed for various heights and diameters of the cylindrical roughness element. Regions of increased shear develop in its wake which persist longer in the adverse pressure gradient case. Consequently, the results of spatial two-dimensional eigenvalue analyses reveal that the unstable wake flow region extends much further downstream and the wake mode instabilities are considerably more amplified. The disturbance kinetic energy production terms are used to assess the contributions of the different shear-layer regions to the mode growth and its dependence on the pressure gradient
elib-URL des Eintrags: | https://elib.dlr.de/114937/ | ||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||
Titel: | Pressure gradient effects on wake flow instabilities behind isolated roughness elements on re-entry capsules | ||||||||||||||||
Autoren: |
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Datum: | 2017 | ||||||||||||||||
Referierte Publikation: | Nein | ||||||||||||||||
Open Access: | Ja | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | re-entry capsule, blunt body, roughness-induced transition, LST-2D, pressure gradient effects | ||||||||||||||||
Veranstaltungstitel: | 7TH EUROPEAN CONFERENCE FOR AERONAUTICS AND AEROSPACE SCIENCES (EUCASS) | ||||||||||||||||
Veranstaltungsort: | Mailand, Italien | ||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||
Veranstaltungsbeginn: | 3 Juli 2017 | ||||||||||||||||
Veranstaltungsende: | 6 Juli 2017 | ||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||
HGF - Programmthema: | Flugzeuge | ||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||
DLR - Forschungsgebiet: | L AR - Aircraft Research | ||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Flugphysik (alt) | ||||||||||||||||
Standort: | Göttingen | ||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Hochgeschwindigkeitskonfigurationen, GO | ||||||||||||||||
Hinterlegt von: | Bachmann, Barbara | ||||||||||||||||
Hinterlegt am: | 23 Nov 2017 16:06 | ||||||||||||||||
Letzte Änderung: | 24 Apr 2024 20:19 |
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