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

Laurence, Stuart and Martinez Schramm, Jan and Hannemann, Klaus (2012) Force and Moment Measurements on a Free-Flying Capsule Model in a High-Enthalpy Shock Tunnel. 28th Aerodynamic Measurement Technology,Ground Testing, and Flight Testing Conference, 25. - 28. Jun. 2012, New Orleans, Louisiana, USA.

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Abstract

Experiments to measure the forces and moments acting on a blunted-cone capsule model are carried out in the High-Enthalpy Shock Tunnel, Göttingen (HEG). 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. Measurements are performed over a range of angles of attack, and excellent agreement is obtained between the techniques. The precision of the visualization-based results is such that variation in the free-stream conditions is the dominant source of uncertainty in the drag coefficient, and is comparable to or larger than the standard error in the lift acceleration for angles of attack above approximately 6º. When applied to pitching measurements, all techniques suffer from large standard errors, but the visualization-based techniques show the capability to outperform accelerometer measurements.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Force and Moment Measurements on a Free-Flying Capsule Model in a High-Enthalpy Shock Tunnel
Authors:
AuthorsInstitution or Email of Authors
Laurence, StuartUNSPECIFIED
Martinez Schramm, JanUNSPECIFIED
Hannemann, KlausUNSPECIFIED
Date:25 June 2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-9
Series Name:Conference Proceedings online
Status:Published
Keywords:Force measurement, short-duration flow, optical tracking, re-entry capsule
Event Title:28th Aerodynamic Measurement Technology,Ground Testing, and Flight Testing Conference
Event Location:New Orleans, Louisiana, USA
Event Type:international Conference
Event Dates:25. - 28. Jun. 2012
Organizer:AIAA
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 of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Stuart Laurence
Deposited On:10 Jul 2012 14:31
Last Modified:13 Sep 2012 14:39

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