Injection into a turbulent boundary layer through different porous surfaces
Abstract
The turbulent boundary layer over a perforated titanium wall is analyzed with and without injection, and the results are compared to previous work on a smooth, solid wall and a porous, sintered-metal wall at the same conditions. Results for the case of no injection show that the perforated titanium and porous, sintered metal walls have local skin friction coefficients that are 30-40% higher than for the smooth wall, and a downward shift in the logarithmic region of the Wall Law from the smooth wall results is observed. Injection through the permeable walls produces a substantial decrease of the local skin friction coefficient and increases the turbulent quantities near the wall. It is found that the porous, sintered wall has a higher skin friction for the case of no injection than does the perforated titanium wall, although the perforated titanium wall has a smaller reduction in skin friction as a function of increasing injection flow rate. However, the perforated titanium wall requires a substantially lower injection pressure than
- Publication:
-
AIAA Journal
- Pub Date:
- June 1984
- DOI:
- 10.2514/3.48519
- Bibcode:
- 1984AIAAJ..22..839C
- Keywords:
-
- Aerodynamic Drag;
- Fluid Injection;
- Porous Boundary Layer Control;
- Skin Friction;
- Turbulent Boundary Layer;
- Reynolds Stress;
- Surface Geometry;
- Surface Roughness Effects;
- Titanium;
- Wind Tunnel Tests;
- Fluid Mechanics and Heat Transfer