Experimental and theoretical investigation of the motion of particles in a compressible vortex
Abstract
Entrainment of particles in a compressible, two dimensional vortex behind a ridge in a shock tube was studied by laser anemometry. The density field was visualized by interferometric measurements. The flow velocity is measured in a fixed place as a function of time, particle size and density. A Michelson interferometer with different arm length visualized the velocity field by interference fringe shifts, and simultaneously gave particle distribution in the vortex at a fixed time. The certainty with which turbulent flows can be visualized, especially flows in boundary layer and mixing layers is determined. The significance of the flow contour lines when the particles cannot follow the flow is shown. The measured data are compared with numerical simulation calculations using simple relations from the literature to determine velocities and densities in the vortex. Particle motion first approximations calculated using the Stokes resistance law agree well with the experiemental results.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- January 1983
- Bibcode:
- 1983STIN...8524264J
- Keywords:
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- Compressible Flow;
- Flow Visualization;
- Laser Doppler Velocimeters;
- Particle Motion;
- Vortices;
- Computerized Simulation;
- Flow Velocity;
- Gas Dynamics;
- Interior Ballistics;
- Mixing Layers (Fluids);
- Shock Tubes;
- Fluid Mechanics and Heat Transfer