Heat transfer measurements of a transpiration-cooled stagnation point in transient hypersonic flow
<p>This paper presents a novel experimental technique where infra-red thermography is employed to directly measure the surface heat transfer of a transpiration cooled porous material in transient hypersonic flow. Experiments were conducted in the Oxford High Density Tunnel on a flat faced hemi...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Institute of Aeronautics and Astronautics
2022
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| _version_ | 1797109216631062528 |
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| author | Naved, I Hermann, T McGilvray, M Ewenz Rocher, M Hambidge, C Doherty, L Le Page, L Grossman, M Vandeperre, L |
| author_facet | Naved, I Hermann, T McGilvray, M Ewenz Rocher, M Hambidge, C Doherty, L Le Page, L Grossman, M Vandeperre, L |
| author_sort | Naved, I |
| collection | OXFORD |
| description | <p>This paper presents a novel experimental technique where infra-red thermography is employed to directly measure the surface heat transfer of a transpiration cooled porous material in transient hypersonic flow. Experiments were conducted in the Oxford High Density Tunnel on a flat faced hemispherical probe at a single Mach 7 free-stream condition (𝑅𝑒𝑢 = 3.84·106 1/m) with Nitrogen, Air, Argon, Krypton and Helium injection gases and mass flow rates ranging from 0.01-0.235 kg s−1m−2 . Surface heat transfer measurements were extracted by imaging directly on the porous material using a FLIR A6751 high-speed long-wave infra-red camera. Porous alumina was chosen due to its favourable thermal properties for infra-red analysis and its very small pore sizes (≈ 2 𝜇m) enabling a uniform outflow. It was found that the Stanton number reduction matched to within 10% of both CFD results and correlations.</p> |
| first_indexed | 2024-03-07T07:38:49Z |
| format | Journal article |
| id | oxford-uuid:038c34ad-4223-4935-a156-e78f75e911cd |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:38:49Z |
| publishDate | 2022 |
| publisher | American Institute of Aeronautics and Astronautics |
| record_format | dspace |
| spelling | oxford-uuid:038c34ad-4223-4935-a156-e78f75e911cd2023-04-06T11:12:35ZHeat transfer measurements of a transpiration-cooled stagnation point in transient hypersonic flowJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:038c34ad-4223-4935-a156-e78f75e911cdEnglishSymplectic ElementsAmerican Institute of Aeronautics and Astronautics2022Naved, IHermann, TMcGilvray, MEwenz Rocher, MHambidge, CDoherty, LLe Page, LGrossman, MVandeperre, L<p>This paper presents a novel experimental technique where infra-red thermography is employed to directly measure the surface heat transfer of a transpiration cooled porous material in transient hypersonic flow. Experiments were conducted in the Oxford High Density Tunnel on a flat faced hemispherical probe at a single Mach 7 free-stream condition (𝑅𝑒𝑢 = 3.84·106 1/m) with Nitrogen, Air, Argon, Krypton and Helium injection gases and mass flow rates ranging from 0.01-0.235 kg s−1m−2 . Surface heat transfer measurements were extracted by imaging directly on the porous material using a FLIR A6751 high-speed long-wave infra-red camera. Porous alumina was chosen due to its favourable thermal properties for infra-red analysis and its very small pore sizes (≈ 2 𝜇m) enabling a uniform outflow. It was found that the Stanton number reduction matched to within 10% of both CFD results and correlations.</p> |
| spellingShingle | Naved, I Hermann, T McGilvray, M Ewenz Rocher, M Hambidge, C Doherty, L Le Page, L Grossman, M Vandeperre, L Heat transfer measurements of a transpiration-cooled stagnation point in transient hypersonic flow |
| title | Heat transfer measurements of a transpiration-cooled stagnation point in transient hypersonic flow |
| title_full | Heat transfer measurements of a transpiration-cooled stagnation point in transient hypersonic flow |
| title_fullStr | Heat transfer measurements of a transpiration-cooled stagnation point in transient hypersonic flow |
| title_full_unstemmed | Heat transfer measurements of a transpiration-cooled stagnation point in transient hypersonic flow |
| title_short | Heat transfer measurements of a transpiration-cooled stagnation point in transient hypersonic flow |
| title_sort | heat transfer measurements of a transpiration cooled stagnation point in transient hypersonic flow |
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