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Investigations on the Near-Wake Region of a Generic Space Launcher Geometry

Saile, Dominik und Gülhan, Ali und Henckels, Andreas (2011) Investigations on the Near-Wake Region of a Generic Space Launcher Geometry. In: Proceedings of 17th AIAA International Space Planes and Hypersonic Systems and Technologies Conference. American Institute of Aeronautics and Astronautics. 17th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 11. - 14. Apr. 2011, San Francisco, California.

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Kurzfassung

The near-wake of a separated flow behind a generic space launcher model with different afterbody extensions is studied experimentally in the hypersonic flow regime (Mach number 6.0 and unit Reynolds number 16×10^6 m−1) with the main objective being to show unsteady flow phenomena. This objective is based on the desire to control the base flow of space launchers to reduce drag and dangerous vibrations. The investigations focus on the unsteadiness of the base-pressure fluctuations and the oscillations of the recompression shock. Base-pressure spectra and spectra of the vertical recompression shock oscillation are discussed for various pressure transducer locations, various nozzle lengths and nozzle diameters. The base-pressure spectra exhibits dominant Strouhal numbers centered at 0.08 at the center positions and 0.08, 0.2, 0.38 at the outskirts of the base, and shows a crucial change with a frequency shift to Strouhal number of 0.27 when a nozzle is applied. Additionally, the pressure spectra indicate an azimuthal mode. The spectra of the recompression shock feature a dominant Strouhal number of 0.2 independent of the geometry of the afterbody. Since the incoming boundary layer is suspected to have an influence on the near-wake flow, the state and the flow conditions are examined in introductory experiments by means of infrared images of the model surface and Pitot pressure at the body corner.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Investigations on the Near-Wake Region of a Generic Space Launcher Geometry
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Saile, DominikDLR
Gülhan, AliDLR
Henckels, AndreasDLR
Datum:2011
Erschienen in:Proceedings of 17th AIAA International Space Planes and Hypersonic Systems and Technologies Conference
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Verlag:American Institute of Aeronautics and Astronautics
Status:veröffentlicht
Stichwörter:Hypersonic, base flow, space launcher, near-wake, frequency, Strouhal number, flow separation, recompression shock, pressure fluctuations, schlieren
Veranstaltungstitel:17th AIAA International Space Planes and Hypersonic Systems and Technologies Conference
Veranstaltungsort:San Francisco, California
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:11. - 14. Apr. 2011
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Raumtransport
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Über- und Hyperschalltechnologien
Hinterlegt von: Dominik Saile
Hinterlegt am:13 Jan 2012 08:34
Letzte Änderung:13 Jan 2012 08:34

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