Measuring the Concentration of Freestream Species on a Hypersonic Transpiration-Cooled Stagnation Point
Measuring the Concentration of Freestream Species on a Hypersonic Transpiration-Cooled Stagnation Point
- New search for: Ewenz Rocher, Marc
- New search for: Hermann, Tobias
- New search for: McGilvray, Matthew
- New search for: Grossman, Madeleine
- New search for: Vandeperre, Luc
- New search for: Ewenz Rocher, Marc
- New search for: Hermann, Tobias
- New search for: McGilvray, Matthew
- New search for: Grossman, Madeleine
- New search for: Vandeperre, Luc
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 , 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.
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Measuring the Concentration of Freestream Species on a Hypersonic Transpiration-Cooled Stagnation Point
Journal of Spacecraft and Rockets ; 59 , 4 ; 1380-1387
2022-04-20
8 pages
Article (Journal)
Electronic Resource
English