Experiments on passive hypersonic boundary layer control using ultrasonically absorptive carbon–carbon material with random microstructure
Wagner, Alexander and Kuhn, Markus and Martinez Schramm, Jan and Hannemann, Klaus (2013) Experiments on passive hypersonic boundary layer control using ultrasonically absorptive carbon–carbon material with random microstructure. Experiments in Fluids, Vol. 54 (1606). Springer Verlag Berlin Heidelberg. DOI: 10.1007/s00348-013-1606-3. ISSN 0723-4864.
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Official URL: http://dx.doi.org/10.1007/s00348-013-1606-3
For the first time, the influence of ultrasonically absorptive carbon–carbon material on hypersonic laminar to turbulent boundary layer transition was investigated experimentally. A 7° half-angle blunted cone with a nose radius of 2.5 mm and a total length of 1,077 mm was tested at zero angle of attack in the High Enthalpy Shock Tunnel Göttingen of the German Aerospace Center (DLR) at Mach 7.5. One-third of the metallic model surface in circumferential direction was replaced by DLR in-house manufactured ultrasonically absorptive carbon–carbon material with random microstructure for passive transition control. The remaining model surface consisted of polished steel and served as reference surface. The model was equipped with coaxial thermocouples to determine the transition location by means of 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 = 1.5 x 106 m-1 to Rem = 6.4 x 106 m-1 at a stagnation enthalpy of h0 = 3.2 MJ/kg and a wall temperature ratio of Tw/T0 = 0.1. The present study revealed a clear damping of the second-mode instabilities and a delay of boundary layer transition along the ultrasonically absorptive carbon–carbon insert.
|Additional Information:||Published online: 10 October 2013|
|Title:||Experiments on passive hypersonic boundary layer control using ultrasonically absorptive carbon–carbon material with random microstructure|
|Journal or Publication Title:||Experiments in Fluids|
|In ISI Web of Science:||Yes|
|Publisher:||Springer Verlag Berlin Heidelberg|
|Keywords:||hypersonic boundary layer transition, HEG, cone, second mode, ultrasonically absorptive coating, second mode damping, transition delay|
|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 - Konzepte und Entwurf|
|Location:||Stuttgart , Göttingen|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Spacecraft|
Institute of Structures and Design > Space Structural Components
|Deposited By:||Ilka Micknaus|
|Deposited On:||30 Oct 2013 16:12|
|Last Modified:||04 Nov 2013 09:22|
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