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Observation of hypersonic high-enthalpy boundary layer with gaseous injection

Tanno, Hideyuki and Komuro, Tomoyuki and Kuhn, Markus and Petkov, Ivaylo (2015) Observation of hypersonic high-enthalpy boundary layer with gaseous injection. Symposium on Shock Waves in Japan, 09.-11. March 2015, Ikaho, Gunma, Japan.

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Transpiration cooling at hypersonic high-enthalpy real-gas flow was experimentally studied in the free-piston shock tunnel HIEST. Heat flux distribution on a flat plate of 1000 mm length was measured, which has an injector made of porous material. The material was permeable C/C, through which gaseous Helium was injected to the plate surface. To adjust unit Reynolds number to almost 2E6/m, which is the critical Reynolds number for transition, test free-steam condition was fixed; stagnation enthalpy was 8 MJ/kg and free-stream Pitot pressure was 200 kPa and unit Reynolds number 2E6/m. Changing of plenum chamber pressure, flow rate of gaseous helium as injectant was changed from 0 to 5 g/s. The measurement showed that the injection was effective to reduce surface heat flux downstream of injector, however, excessive injectant flow rate caused early onset of boundary layer transition, which increase higher heat flux rather than that of no-injection.

Item URL in elib:https://elib.dlr.de/95989/
Document Type:Conference or Workshop Item (Speech)
Title:Observation of hypersonic high-enthalpy boundary layer with gaseous injection
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tanno, HideyukiJAXA, Kakuda, JapanUNSPECIFIED
Komuro, TomoyukiJAXA, Kakuda, JapanUNSPECIFIED
Kuhn, Markusmarkus.kuhn (at) dlr.deUNSPECIFIED
Petkov, Ivayloivaylo.petkov (at) dlr.deUNSPECIFIED
Date:March 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-4
Keywords:boundary layer, carbon/carbon, shock tunnel, porous material, transpiration cooling, high-enthalpy flow
Event Title:Symposium on Shock Waves in Japan
Event Location:Ikaho, Gunma, Japan
Event Type:national Conference
Event Dates:09.-11. March 2015
Organizer:School of Science and Technology
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, R - EU Projekte Raumtransport (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space System Integration
Deposited By: Kuhn, Markus
Deposited On:11 Jun 2015 11:30
Last Modified:30 Nov 2016 12:11

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