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Investigation of Unsteady/Quasi-Steady Scramjet Behavior using High-Speed Visualization Techniques

Laurence, Stuart and Ozawa, Hiroshi and Lieber, Damien and Martinez Schramm, Jan and Hannemann, Klaus (2012) Investigation of Unsteady/Quasi-Steady Scramjet Behavior using High-Speed Visualization Techniques. 18th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 24. - 28. Sept. 2012, Tours, France. DOI: 10.2514/6.2012-5913

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Official URL: http://www.aiaa.org

Abstract

Experiments are carried out in the HEG (High Enthalpy Shock Tunnel Göttingen) wind-tunnel to obtain detailed measurements on the HyShot II scramjet configuration at equivalence ratios close to the incipient choking point at simulated 28-km altitude flight conditions. Diagnostic techniques include time-resolved pressure measurements and simultaneous high-speed schlieren and OH* chemiluminescence imaging. Similar to previous experiments at higher equivalence ratios, the onset of choking is signaled by the formation of an unsteady shock train that initially propagates up the duct. The shock motion then slows, however, and a quasi-steady topology develops with the shock lodged at a position that depends strongly on the equivalence ratio (the position lying further upstream for higher equivalence ratios). This topology persists until the conclusion of the steady test time. Based on these measurements, a value for the critical choking equivalence ratio, i.e., that at which the shock train first appears, in the range of 0.38-0.39 is determined. High-speed temperature sensitive paint measurements are also carried out on the model intake ramp to provide global information on the boundary-layer transition behavior.

Item URL in elib:https://elib.dlr.de/78393/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Investigation of Unsteady/Quasi-Steady Scramjet Behavior using High-Speed Visualization Techniques
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Laurence, Stuartstuart.laurence (at) dlr.deUNSPECIFIED
Ozawa, HiroshiUNSPECIFIEDUNSPECIFIED
Lieber, DamienUNSPECIFIEDUNSPECIFIED
Martinez Schramm, JanUNSPECIFIEDUNSPECIFIED
Hannemann, KlausUNSPECIFIEDUNSPECIFIED
Date:24 September 2012
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2012-5913
Page Range:pp. 1-12
Series Name:Conference Proceedings online
Status:Published
Keywords:Supersonic combustion, unstart, flow visualization
Event Title:18th AIAA International Space Planes and Hypersonic Systems and Technologies Conference
Event Location:Tours, France
Event Type:international Conference
Event Dates:24. - 28. Sept. 2012
Organizer:The American Institute of Aeronautics and Astronautics (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: Laurence, Stuart
Deposited On:13 Nov 2012 13:27
Last Modified:31 Jul 2019 19:38

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