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Experimental investigation of hypersonic boundary-layer stabilization on a cone by means of ultrasonically absorptive carbon-carbon material

Wagner, Alexander and Hannemann, Klaus and Kuhn, Markus (2012) Experimental investigation of hypersonic boundary-layer stabilization on a cone by means of ultrasonically absorptive carbon-carbon material. 18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference, 24. Sept. - 28. Sept. 2012, Tours, Frankreich. DOI: 10.2514/6.2012-5865.

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

Abstract

Hypersonic boundary-layer transition on a 7 half-angle cone using ultrasonically absorptive carbon-carbon material was investigated experimentally in the DLR High Enthalpy Shock Tunnel G�ottingen (HEG) at Mach 7.5. The cone model was tested at zero angle of attack with a nose radius of 2.5 mm and a total length of 1077 mm. One third of the model surface in circumferential direction was equipped with an in-house manufactured porous carbon-carbon material. The remaining model surface consisted of polished steel and served as reference surface. The model was equipped with co-axial thermocouples to determine the transition location by means of the surface heat flux distribution. Flush mounted piezoelectric fast-response pressure transducers were used to measure the pressure fluctuations in the boundary-layer associated with second-mode instabilities. The free-stream unit Reynolds number was varied over a range of Rem = 1.46 10^6 /m to Rem = 6.35 10^6 /m at a stagnation enthalpy of h0 = 3.2 MJ/kg and a temperature ration of Tw/T0= 0.1 . The present study revealed a signicant damping of the second-mode instabilities and an increase of the transition Reynolds number by means of an ultrasonically absorptive C/C material with random microstructure. Furthermore, the eect of small angle of attack variations on the transition location on the model was investigated.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Experimental investigation of hypersonic boundary-layer stabilization on a cone by means of ultrasonically absorptive carbon-carbon material
Authors:
AuthorsInstitution or Email of Authors
Wagner, Alexanderalexander.wagner@dlr.de
Hannemann, Klausklaus.hannemann@dlr.de
Kuhn, MarkusMarkus.Kuhn@dlr.de
Date:September 2012
Refereed publication:No
In ISI Web of Science:No
DOI:10.2514/6.2012-5865
Series Name:Conference Proceedings online
Status:Published
Keywords:transition, porous coating, 2nd mode damping, cone, HEG
Event Title:18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference
Event Location:Tours, Frankreich
Event Type:international Conference
Event Dates:24. Sept. - 28. Sept. 2012
Organizer:AIAA / 3AF
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 - Projekt IMENS-3C (old)
Location: Stuttgart , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Institute of Structures and Design > Space Structural Components
Deposited By: Alexander Wagner
Deposited On:23 Oct 2012 08:58
Last Modified:12 Dec 2013 21:48

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