LDV measurements of turbulent baroclinic boundary layers
- Fraunhofer-Institut fuer Kurzzeitdynamik - Ernst-Mach-Institut (EMI), Freiburg im Breisgau (Germany)
- Lawrence Livermore National Lab., El Segundo, CA (United States)
Described here are shock tube experiments of nonsteady, turbulent boundary layers with large density variations. A dense-gas layer was created by injecting Freon through the porous floor of the shock tube. As the shock front propagated along the layer, vorticity was created at the air-Freon interface by an inviscid, baroclinic mechanism. Shadow-schlieren photography was used to visualize the turbulent mixing in this baroclinic boundary layer. Laser-Doppler-Velocimetry (LDV) was used to measure the streamwise velocity histories at 14 heights. After transition, the boundary layer profiles may be approximated by a power-law function u {approximately} u{sup {alpha}} where {alpha} {approx_equal} 3/8. This value lies between the clean flat plate value ({alpha} = 1/7) and the dusty boundary layer value ({alpha} {approx_equal} 0.7), and is controlled by the gas density near the wall.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Defense Nuclear Agency, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10192039
- Report Number(s):
- UCRL-JC-113306; CONF-930788-7; ON: DE94002025; CNN: Grant DNA IACRO 92-824; Grant DNA 001-91-C-0039
- Resource Relation:
- Conference: 19. international symposium on shock waves,Marseille (France),26-30 Jul 1993; Other Information: PBD: Jul 1993
- Country of Publication:
- United States
- Language:
- English
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