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Transition Experiment with a Blunt Apollo Shape like Capsule in Hypersonic Ludwieg Tube

Ali, Syed Raza Christopher and Radespiel, Rolf and Theiß, Alexander (2014) Transition Experiment with a Blunt Apollo Shape like Capsule in Hypersonic Ludwieg Tube. 63. Deutscher Luft- und Raumfahrtkongress 2014, 16. Sept. 2014, Augsburg, Deutschland.

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Official URL: http://www.dlrk2014.dglr.de


Experimental and numerical results on laminar-turbulent transition in the boundary layer of a blunt Apollo-like capsule at 0° and 24° angle of attack (AOA) are presented. Infrared thermography was used to observe the transition behavior for varying unit Reynolds number runs (Re∞ = 6e6 /m to Re∞ = 20e6 /m) and for two different surface condition. For the investigated capsule surface with a mean roughness of Ra = 10 μm, transitional surface heating firstly appeared at about Re∞ = 15e6, whereas for a mean roughness of Ra = 0.5 μm no indications for a transitional boundary layer were found at all. PCB and Kulite sensors are used to measure surface pressure fluctuations inside the boundary layer, but did not show any peaks in the frequency spectra which might be related to harmonic boundary layer disturbances. The only relevant peak in the spectra is attributed to bow shock oscillations. Space/time correlations of pressure data indicates low linear correlation of consecutive and crosswise placed sensors and help to characterize the nature of pressure fluctuation.

Item URL in elib:https://elib.dlr.de/91217/
Document Type:Conference or Workshop Item (Speech)
Title:Transition Experiment with a Blunt Apollo Shape like Capsule in Hypersonic Ludwieg Tube
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-10
Series Name:Conference Proceedings
Keywords:re-entry capsule, blunt body, transition, infrared thermography, measurement of boundary layer instabilites, Space/time correlations of pressure data
Event Title:63. Deutscher Luft- und Raumfahrtkongress 2014
Event Location:Augsburg, Deutschland
Event Type:national Conference
Event Dates:16. Sept. 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Micknaus, Ilka
Deposited On:06 Nov 2014 09:17
Last Modified:06 Nov 2014 09:17

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