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Passive Control of the Flow Around the Stratospheric Observatory for Infrared Astronomy

Schmid, Sven and Lutz, Thorsten and Krämer, Ewald and Kühn, Timo (2009) Passive Control of the Flow Around the Stratospheric Observatory for Infrared Astronomy. Journal of Aircraft, 46 (4), pp. 1319-1325. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.40777

Full text not available from this repository.

Abstract

The unsteady flowfield around the Stratospheric Observatory for Infrared Astronomy, a reflecting telescope carried inside an open port of a Boeing 747SP, has been simulated by means of detached eddy simulations and unsteady Reynolds-averaged Navier–Stokes simulations. Vortex generators have been placed upstream of the cavity to control the shear layer spanning the opening. The influence of baffles and displacement bodies placed inside the telescope port on the frequencies of acoustic resonant modes was investigated by acoustic simulations, based on the solution of the homogenous Helmholtz equation. The objective of this study is to improve the telescope’s performance by mitigating the amplitudes and changing the characteristic frequencies of the pressure fluctuations inside the cavity. The present simulations show that the investigated measures have a high potential to increase the telescope’s pointing stability.

Item URL in elib:https://elib.dlr.de/55228/
Document Type:Article
Title:Passive Control of the Flow Around the Stratospheric Observatory for Infrared Astronomy
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schmid, SvenDSI - German SOFIA InstituteUNSPECIFIED
Lutz, ThorstenIAG - University of StuttgartUNSPECIFIED
Krämer, EwaldHead of IAG - University of StuttgartUNSPECIFIED
Kühn, TimoDLR (timo.kuehn (at) dlr.de)UNSPECIFIED
Date:2009
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:46
DOI :10.2514/1.40777
Page Range:pp. 1319-1325
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Status:Published
Keywords:Infrared Astronomy, Cavity Flow, Vortex generators, Passive Flow Control, CFD, URANS, DES
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt SOFIA (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Kühn, Timo
Deposited On:14 Sep 2009 15:27
Last Modified:08 Mar 2018 18:40

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