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Transpiration Cooling at Hypersonic Flight - AKTiV on SHEFEXII

Böhrk, Hannah (2014) Transpiration Cooling at Hypersonic Flight - AKTiV on SHEFEXII. 11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference, 16.-20. Juni 2014, Atlanta, USA.

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The present paper presents the in-flight measurement of the transpiration cooling experiment AKTiV flown on the sub-orbital re-entry configuration SHEFEXII. Thermal response of the structure is measured just up- and downstream of a cooled sample with a non-cooled reference set-up on the opposite side of the vehicle. The measurement shows that the heat flux is reduced upon coolant exhaust. The maximum temperature reduction by transpiration-cooling is observed on the porous sample with 87 K, while downstream the sample, the temperature reduction by film cooling is 75 K. This corresponds to cooling effi�ciencies of 61% and 46% on the sample and downstream, respectively. The evaluation is supported by the semi-analytical tool HEATS, based on a transient heat balance at the surface. Comparison of the results with HEATS shows that the heat flux predicted with HEATS is in good concurrence with the measured temperatures on the cooled sample, as well as upstream and downstream with a maximum deviation by 14%. The analysis shows that the flow condition around the sharp-edged, faceted vehicle remains longer laminar than expected.

Item URL in elib:https://elib.dlr.de/91997/
Document Type:Conference or Workshop Item (Speech)
Title:Transpiration Cooling at Hypersonic Flight - AKTiV on SHEFEXII
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Date:16 June 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:TPS active cooling transpiration efficiency
Event Title:11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference
Event Location:Atlanta, USA
Event Type:international Conference
Event Dates:16.-20. Juni 2014
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 - Shefex III
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space System Integration
Deposited By: Böhrk, Hannah
Deposited On:23 Dec 2014 17:30
Last Modified:23 Dec 2014 17:30

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