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Experimental determination of aerodynamic coefficients of simple-shaped bodies free-flying in hypersonic flow

Seltner, Patrick and Willems, Sebastian and Gülhan, Ali (2018) Experimental determination of aerodynamic coefficients of simple-shaped bodies free-flying in hypersonic flow. International Conference on High-Speed Vehicle Science Technology (HiSST 2018), 26.-29. Nov. 2018, Moskau, Russland.

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Abstract

The aerodynamic drag, lift and pitching moment of basic geometric bodies in hypersonic flows has been measured. Therefore, simple geometries like spheres, cubes and cylinders were studied at a Mach number of 7.0. Furthermore, the influence of the flight attitude on aerodynamic coefficients and the static stability behaviour of these objects have been investigated. This should enhance the understanding of atmospheric re-entry of rotating objects as well as the improvement of available codes to predict re-entry trajectories of satellites, meteoroids and space stations. Experiments were carried out in the Hypersonic Wind Tunnel (H2K) at the German Aerospace Center (DLR) in Cologne using a free-flight technique. This technique allows a continuously rotation and avoids the influence of stings or balances to determine the forces and moments onto an object. The model motion is tracked by a nonintrusive stereo tracking system with two high-speed cameras. Markers are utilized on the model surface to apply a digital image correlation algorithm. Thus, the three-dimensional trajectories and attitudes of the free-flying objects are reconstructed. After a careful post-processing of the high-resolution motion data, the aerodynamic coefficients are determined. Furthermore, the unsteady flow structures are visualized with high-speed schlieren photography. As a result, the aerodynamic coefficients of cubic and cylindrical bodies are a function of the pitch angle.

Item URL in elib:https://elib.dlr.de/124113/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental determination of aerodynamic coefficients of simple-shaped bodies free-flying in hypersonic flow
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Seltner, PatrickPatrick.Seltner (at) dlr.dehttps://orcid.org/0000-0002-7706-9220
Willems, SebastianSebastian.Willems (at) dlr.dehttps://orcid.org/0000-0002-5576-7829
Gülhan, AliAli.Guelhan (at) dlr.deUNSPECIFIED
Date:27 November 2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:atmospheric re-entry, hypersonic wind tunnel, high-speed aerodynamics, free-flight technique, aerodynamic coefficients
Event Title:International Conference on High-Speed Vehicle Science Technology (HiSST 2018)
Event Location:Moskau, Russland
Event Type:international Conference
Event Dates:26.-29. Nov. 2018
Organizer:TsAGI
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Supersonoc and Hypersonic Technology
Deposited By: Seltner, Herr Patrick
Deposited On:23 Oct 2019 12:42
Last Modified:23 Oct 2019 12:42

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