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Experiments on Transpiration Cooling in a Model Scramjet Combustor Using Background Oriented Schlieren (BOS)

Strauss, Friedolin and General, Stephan and Manfletti, Chiara and Schlechtriem, Stefan (2018) Experiments on Transpiration Cooling in a Model Scramjet Combustor Using Background Oriented Schlieren (BOS). In: 11th ISICP. 11th International Symposium on Special Topics in Chemical Propulsion & Energetic Materials, 2019-09-09 - 2019-09-13, Stuttgart, Deutschland.

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The Institute of Space Propulsion of the German Aerospace Center (DLR) has developed and set up a research test bench to investigate the applicability of transpiration cooling systems to scramjets and to examine the resulting phenomena in the supersonic flow. It consists of a chemical hydrogen / oxygen air vitiator with attached Scramjet model combustion chamber with an optional half wedge shaped shock generator. The used porous media consists of high temperature resistant stainless steel and Inconel with different porosities. Gaseous nitrogen and gaseous hydrogen were used as coolant with different pre-pressures. Optical access allows the use of a Schlieren system and Background Oriented Schlieren (BOS) for flow investigations. Phenomena such as hot spots on the porous wall, inefficient cooling and shock-boundary layer interaction (SBLI) were observed in the experiments. With the BOS system thickening of the boundary layer / boundary layer separation was demonstrated. Furthermore, the development of shock trains forced by the introduction of a secondary coolant flow can be illustrated, leading to an increased physical blockage up to the choking case. This publication summarizes the SBLI results gained by application of Background Oriented Schlieren (BOS) setup and compares them with results obtained by the help of a classic Schlieren setup. BOS emerged in the experiments to be less affected by changes in the refractive index of the quartz glass windows due to strong heating compared to the classic Schlieren method. Challenges in optimizing the BOS systems’ performance and subsequent changes in the test setup are discussed.

Item URL in elib:https://elib.dlr.de/129997/
Document Type:Conference or Workshop Item (Speech)
Additional Information:ISICP2018-23772
Title:Experiments on Transpiration Cooling in a Model Scramjet Combustor Using Background Oriented Schlieren (BOS)
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Strauss, FriedolinUNSPECIFIEDhttps://orcid.org/0000-0002-1385-4326UNSPECIFIED
General, StephanUNSPECIFIEDhttps://orcid.org/0000-0001-5606-882XUNSPECIFIED
Schlechtriem, StefanUNSPECIFIEDhttps://orcid.org/0000-0002-3714-9664UNSPECIFIED
Date:13 September 2018
Journal or Publication Title:11th ISICP
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Transpiration Cooling, Fluid Dynamics, Thermodynamics, Scramjet, Hypersonics, High-Speed Air Breathing Propulsion, Ground Testing, Optical Measurement Technique, Background Oriented Schlieren, BOS
Event Title:11th International Symposium on Special Topics in Chemical Propulsion & Energetic Materials
Event Location:Stuttgart, Deutschland
Event Type:international Conference
Event Start Date:9 September 2019
Event End Date:13 September 2019
Organizer:DLR - Deutsches Zentrum für Luft- und Raumfahrt
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion
Deposited By: Strauss, Friedolin
Deposited On:31 Oct 2019 10:42
Last Modified:24 Apr 2024 20:33

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