An experimental investigation of the unsteady behavior of blunt fin-induced shock wave turbulent boundary layer interactions
Abstract
Blunt fin induced shock wave turbulent boundary layer interactions were studied. The characteristics of the fluctuating surface pressure distribution and the parameters controlling it were determined. The fin centerline and up to four diameters outboard of it were measured. It is shown that very high intensity r.m.s. pressure levels occur up to almost two orders of magnitude above that of the incoming boundary layer. The highest intensities occur on centerline ahead of the fin. The r.m.s. pressure distribution is characterized by three distinct peaks which decrease at different rates with distance outboard. Even four diameters off centerline, the maximum r.m.s. value in the distribution is still an order of magnitude larger than that of the incoming boundary layer. Outboard of the centerline, the r.m.s. pressure level downstream of the freestream shock wave steadily decreases. Within a distance of six to eight diameters it is close to the undisturbed value. With different diameter fins and different boundary layers, the qualitative characteristics are the same. The quantitative results depend on the ratio D/Delta.
- Publication:
-
Princeton Univ. Report
- Pub Date:
- May 1982
- Bibcode:
- 1982prnc.rept.....D
- Keywords:
-
- Fins;
- Pressure Distribution;
- Shock Waves;
- Turbulent Boundary Layer;
- Unsteady Flow;
- Blunt Bodies;
- Pressure Measurement;
- Reynolds Number;
- Wind Tunnel Models;
- Wind Tunnel Tests;
- Fluid Mechanics and Heat Transfer