Abstract
This paper presents the performance of pressure sensitive
paint (PSP) for the direct investigation of a transpiration
cooled surface. This technique allows the quantification of
the pressure distribution on a porous surface with blowing.
Additionally, it can be used to detect where the coolant is
on the surface, thus measuring the transport of molecular
oxygen to a transpiration cooled surface. For highly turbulent
flows, it can also be used to evaluate the film effectiveness. A
porous aluminium sample was anodised and dip coated in a
PSP luminophore solution. It was fitted into a flat plate model
and exposed to a Mach 5 cross-flow in the Oxford High Density Tunnel. Tests were conducted with no coolant injection,
air injection and with nitrogen injection at increasing blowing ratios. The film effectiveness of the transpiration cooled
surface was obtained for several conditions at Re = 15.5 -
31.5 ×106
/m and F = 0.001 - 0.002. The film effectiveness
increases as the Reynolds number decreases and the blowing
ratio increases, which is in good qualitative agreement with
the literature. Furthermore, it shows the same features as a
velocity map of the outflow
paint (PSP) for the direct investigation of a transpiration
cooled surface. This technique allows the quantification of
the pressure distribution on a porous surface with blowing.
Additionally, it can be used to detect where the coolant is
on the surface, thus measuring the transport of molecular
oxygen to a transpiration cooled surface. For highly turbulent
flows, it can also be used to evaluate the film effectiveness. A
porous aluminium sample was anodised and dip coated in a
PSP luminophore solution. It was fitted into a flat plate model
and exposed to a Mach 5 cross-flow in the Oxford High Density Tunnel. Tests were conducted with no coolant injection,
air injection and with nitrogen injection at increasing blowing ratios. The film effectiveness of the transpiration cooled
surface was obtained for several conditions at Re = 15.5 -
31.5 ×106
/m and F = 0.001 - 0.002. The film effectiveness
increases as the Reynolds number decreases and the blowing
ratio increases, which is in good qualitative agreement with
the literature. Furthermore, it shows the same features as a
velocity map of the outflow
| Original language | English |
|---|---|
| Number of pages | 9 |
| Publication status | Published - 30 Sept 2019 |
| Event | International Conference on Flight vehicles, Aerothermodynamics and Re-entry Missions and Engineering - Monopoli, Monopoli, Italy Duration: 30 Sept 2019 → 3 Oct 2019 |
Conference
| Conference | International Conference on Flight vehicles, Aerothermodynamics and Re-entry Missions and Engineering |
|---|---|
| Abbreviated title | FAR2019 |
| Country/Territory | Italy |
| City | Monopoli |
| Period | 30/09/19 → 3/10/19 |