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, 2012-09-24 - 2012-09-28, Tours, Frankreich. doi: 10.2514/6.2012-5865.
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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.
Item URL in elib: | https://elib.dlr.de/77787/ | ||||||||||||||||
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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: |
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Date: | September 2012 | ||||||||||||||||
Refereed publication: | No | ||||||||||||||||
Open Access: | No | ||||||||||||||||
Gold Open Access: | No | ||||||||||||||||
In SCOPUS: | 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 Start Date: | 24 September 2012 | ||||||||||||||||
Event End Date: | 28 September 2012 | ||||||||||||||||
Organizer: | AIAA / 3AF | ||||||||||||||||
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 - 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: | Wagner, Alexander | ||||||||||||||||
Deposited On: | 23 Oct 2012 08:58 | ||||||||||||||||
Last Modified: | 24 Apr 2024 19:44 |
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