Pressure-sensitive paint diagnostic to measure species concentration on transpiration-cooled walls
This paper presents the performance of pressure-sensitive paint (PSP) for the direct measurement of species concentration on a porous surface with mass injection. It is used to measure the ability of an injected gas to reduce the mass transfer of freestream species to the surface. A porous alumina s...
| Autores principales: | , , , , , , , , |
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| Formato: | Journal article |
| Lenguaje: | English |
| Publicado: |
Springer
2021
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| Sumario: | This paper presents the performance of pressure-sensitive paint (PSP) for the direct measurement of species concentration on a porous surface with mass injection. It is used to measure the ability of an injected gas to reduce the mass transfer of freestream species to the surface. A porous alumina sample was sprayed with a PSP luminophore solution. The sample was installed into a flat plate model and exposed to hypersonic cross-flows in the Oxford High-Density Tunnel. Tests were conducted with no coolant injection, air injection, and nitrogen injection at increasing blowing ratios. Oxygen partial pressure maps on the transpiration-cooled surface were obtained for several conditions at unit Reynolds numbers between 2.58−5.0×107/m and blowing ratios between 0.016−0.078%. The oxygen pressure decreases as the unit Reynolds number decreases and the blowing ratio increases. |
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