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Force and Moment Measurements on a Free-Flying Capsule in a Shock Tunnel

Laurence, Stuart Jon and Butler, C. S. and Hannemann, Klaus and Martinez Schramm, Jan (2017) Force and Moment Measurements on a Free-Flying Capsule in a Shock Tunnel. Journal of Spacecraft and Rockets. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.A33820 ISSN 0022-4650

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Experiments to measure the forces and moments acting on a blunted-cone capsule model are conducted in the High Enthalpy Shock Tunnel Göttingen. A free-flying arrangement is employed, whereby the model is initially suspended by weak threads that are detached by the arrival of the flow, allowing unrestrained flight during the steady test time. High-speed shadowgraphy is used to capture the model motion. Induced forces and moments are measured using both internally mounted accelerometers and visualization-based tracking techniques. Improvements to the visualization based techniques allow the elimination of several previously identified sources of error. Drag, lift, and pitchingmoment coefficients are derived over a range of angles of attack up to 6 deg, and excellent agreement is obtained between the techniques. Results are also compared with those from numerical simulations, with agreement found to lie within the experimental error for the drag and pitching coefficients but slightly outside for the lift coefficients. The precision of the visualization-based results is such that uncertainty in the freestream conditions is the dominant source of experimental error in the drag coefficient, and it becomes comparable to or larger than the standard error in the lift and pitching accelerations at the maximum angle of attack tested.

Item URL in elib:https://elib.dlr.de/118115/
Document Type:Article
Title:Force and Moment Measurements on a Free-Flying Capsule in a Shock Tunnel
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Laurence, Stuart JonDept. of Aerospace Engineering, University of MarylandUNSPECIFIED
Butler, C. S.Dept. of Aerospace Engineering, University of MarylandUNSPECIFIED
Hannemann, Klausklaus.hannemann (at) dlr.deUNSPECIFIED
Martinez Schramm, Janjan.martinez (at) dlr.deUNSPECIFIED
Journal or Publication Title:Journal of Spacecraft and Rockets
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2514/1.A33820
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:High Enthalpy Shock Tunnel Göttingen, free-flight force measurement technique, optical tracking, capsule configuration
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Bachmann, Barbara
Deposited On:11 Jan 2018 08:50
Last Modified:08 Mar 2018 18:45

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