Flow characterisation of transpiring porous media for hypersonic vehicles
This paper experimentally examines the internal and external flow characteristics of porous zirconium diboride (Z rB2), an Ultra-High-Temperature-Ceramic (UHTC) and a potential candidate for transpiration cooling of hypersonic vehicles. This is performed for both partially sintered material and full...
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| Format: | Conference item |
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American Institute of Aeronautics and Astronautics
2018
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| _version_ | 1797090480669851648 |
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| author | Ifti, H Hermann, T McGilvray, M |
| author_facet | Ifti, H Hermann, T McGilvray, M |
| author_sort | Ifti, H |
| collection | OXFORD |
| description | This paper experimentally examines the internal and external flow characteristics of porous zirconium diboride (Z rB2), an Ultra-High-Temperature-Ceramic (UHTC) and a potential candidate for transpiration cooling of hypersonic vehicles. This is performed for both partially sintered material and fully densified material with cast features. The Darcy and Forchheimer permeability coefficients of these samples are determined using an ISO standard test rig. The outflow of the transpiring porous samples is investigated where no hypersonic cross-flow is involved using hot-wire anemometry and focused Schlieren visualisation. The velocity maps obtained from the hot-wire data show significant non-uniformities across the UHTC’s outflow region, both at low and high differential pressures. The focused Schlieren using carbon dioxide as the injected gas reveals unsteady structures at high differential pressures as the outflowing gas interacts with the surrounding air. |
| first_indexed | 2024-03-07T03:19:13Z |
| format | Conference item |
| id | oxford-uuid:b6de3245-f34d-4833-9cbc-f6148140a1cb |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:19:13Z |
| publishDate | 2018 |
| publisher | American Institute of Aeronautics and Astronautics |
| record_format | dspace |
| spelling | oxford-uuid:b6de3245-f34d-4833-9cbc-f6148140a1cb2022-03-27T04:44:09ZFlow characterisation of transpiring porous media for hypersonic vehiclesConference itemhttp://purl.org/coar/resource_type/c_5794uuid:b6de3245-f34d-4833-9cbc-f6148140a1cbSymplectic Elements at OxfordAmerican Institute of Aeronautics and Astronautics2018Ifti, HHermann, TMcGilvray, MThis paper experimentally examines the internal and external flow characteristics of porous zirconium diboride (Z rB2), an Ultra-High-Temperature-Ceramic (UHTC) and a potential candidate for transpiration cooling of hypersonic vehicles. This is performed for both partially sintered material and fully densified material with cast features. The Darcy and Forchheimer permeability coefficients of these samples are determined using an ISO standard test rig. The outflow of the transpiring porous samples is investigated where no hypersonic cross-flow is involved using hot-wire anemometry and focused Schlieren visualisation. The velocity maps obtained from the hot-wire data show significant non-uniformities across the UHTC’s outflow region, both at low and high differential pressures. The focused Schlieren using carbon dioxide as the injected gas reveals unsteady structures at high differential pressures as the outflowing gas interacts with the surrounding air. |
| spellingShingle | Ifti, H Hermann, T McGilvray, M Flow characterisation of transpiring porous media for hypersonic vehicles |
| title | Flow characterisation of transpiring porous media for hypersonic vehicles |
| title_full | Flow characterisation of transpiring porous media for hypersonic vehicles |
| title_fullStr | Flow characterisation of transpiring porous media for hypersonic vehicles |
| title_full_unstemmed | Flow characterisation of transpiring porous media for hypersonic vehicles |
| title_short | Flow characterisation of transpiring porous media for hypersonic vehicles |
| title_sort | flow characterisation of transpiring porous media for hypersonic vehicles |
| work_keys_str_mv | AT iftih flowcharacterisationoftranspiringporousmediaforhypersonicvehicles AT hermannt flowcharacterisationoftranspiringporousmediaforhypersonicvehicles AT mcgilvraym flowcharacterisationoftranspiringporousmediaforhypersonicvehicles |