Measuring the concentration of freestream species on a hypersonic transpiration-cooled stagnation point
This paper presents direct surface concentration measurements of a transpiration-cooled stagnation point in hypersonic flow. Pressure-sensitive paint is employed on a porous alumina sample to measure the concentration of freestream species and thus how well the coolant mitigates mass diffusion from...
| Main Authors: | , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
American Institute of Aeronautics and Astronautics
2022
|
| _version_ | 1797107809599356928 |
|---|---|
| author | Ewenz Rocher, M Hermann, T McGilvray, M Grossman, M Vandeperre, L |
| author_facet | Ewenz Rocher, M Hermann, T McGilvray, M Grossman, M Vandeperre, L |
| author_sort | Ewenz Rocher, M |
| collection | OXFORD |
| description | This paper presents direct surface concentration measurements of a transpiration-cooled stagnation point in hypersonic flow. Pressure-sensitive paint is employed on a porous alumina sample to measure the concentration of freestream species and thus how well the coolant mitigates mass diffusion from the freestream to the surface. Experiments are conducted at Mach 6.9 at three different pitot pressures: 10, 20, and 30 kPa. Porous alumina is chosen due to its ability to bond pressure-sensitive paint and its similar microstructure to porous ultra-high-temperature ceramics. Nitrogen, argon, and krypton are used as injection gases at mass flow rates ranging from 0.01 to 0.55 kg/(m2⋅s), in order to displace up to 99% of the freestream gas at the surface. The experimental data show that transpiration cooling is more effective in displacing freestream gas than predicted by analytical models and numerical solutions. The microheterogeneous surface with recessed pores means that there is an additional pressure gradient within the first layer of pores. |
| first_indexed | 2024-03-07T07:20:56Z |
| format | Journal article |
| id | oxford-uuid:25e48738-d3f8-461a-95a4-d99caa5ae492 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:20:56Z |
| publishDate | 2022 |
| publisher | American Institute of Aeronautics and Astronautics |
| record_format | dspace |
| spelling | oxford-uuid:25e48738-d3f8-461a-95a4-d99caa5ae4922022-10-10T08:00:47ZMeasuring the concentration of freestream species on a hypersonic transpiration-cooled stagnation pointJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:25e48738-d3f8-461a-95a4-d99caa5ae492EnglishSymplectic ElementsAmerican Institute of Aeronautics and Astronautics2022Ewenz Rocher, MHermann, TMcGilvray, MGrossman, MVandeperre, LThis paper presents direct surface concentration measurements of a transpiration-cooled stagnation point in hypersonic flow. Pressure-sensitive paint is employed on a porous alumina sample to measure the concentration of freestream species and thus how well the coolant mitigates mass diffusion from the freestream to the surface. Experiments are conducted at Mach 6.9 at three different pitot pressures: 10, 20, and 30 kPa. Porous alumina is chosen due to its ability to bond pressure-sensitive paint and its similar microstructure to porous ultra-high-temperature ceramics. Nitrogen, argon, and krypton are used as injection gases at mass flow rates ranging from 0.01 to 0.55 kg/(m2⋅s), in order to displace up to 99% of the freestream gas at the surface. The experimental data show that transpiration cooling is more effective in displacing freestream gas than predicted by analytical models and numerical solutions. The microheterogeneous surface with recessed pores means that there is an additional pressure gradient within the first layer of pores. |
| spellingShingle | Ewenz Rocher, M Hermann, T McGilvray, M Grossman, M Vandeperre, L Measuring the concentration of freestream species on a hypersonic transpiration-cooled stagnation point |
| title | Measuring the concentration of freestream species on a hypersonic transpiration-cooled stagnation point |
| title_full | Measuring the concentration of freestream species on a hypersonic transpiration-cooled stagnation point |
| title_fullStr | Measuring the concentration of freestream species on a hypersonic transpiration-cooled stagnation point |
| title_full_unstemmed | Measuring the concentration of freestream species on a hypersonic transpiration-cooled stagnation point |
| title_short | Measuring the concentration of freestream species on a hypersonic transpiration-cooled stagnation point |
| title_sort | measuring the concentration of freestream species on a hypersonic transpiration cooled stagnation point |
| work_keys_str_mv | AT ewenzrocherm measuringtheconcentrationoffreestreamspeciesonahypersonictranspirationcooledstagnationpoint AT hermannt measuringtheconcentrationoffreestreamspeciesonahypersonictranspirationcooledstagnationpoint AT mcgilvraym measuringtheconcentrationoffreestreamspeciesonahypersonictranspirationcooledstagnationpoint AT grossmanm measuringtheconcentrationoffreestreamspeciesonahypersonictranspirationcooledstagnationpoint AT vandeperrel measuringtheconcentrationoffreestreamspeciesonahypersonictranspirationcooledstagnationpoint |