An investigation of the effects of seeding in laser velocimeter systems
Abstract
Errors in laser velocimeter measurements associated with the lag of seeding particles in subsonic and transonic flows were investigated experimentally and theoretically. In a low-speed flow, errors exceeding 5 percent were measured for particle diameters greater than 5 microns. In transonic flows, errors up to 60 percent were measured for particles with 2-3-micron diameters and up to 30 percent for 1-2-micron particles. A three-dimensional method was developed to determine the magnitude of errors due to the lag in seeding particle response based on a simplified particle force balance model and an empirical coefficient of drag model for spherical bodies. A one-dimensional version of this model was shown to be successful in correcting velocity measurements in both the subsonic and transonic flow regions.
- Publication:
-
AIAA, Aerospace Sciences Meeting
- Pub Date:
- January 1990
- Bibcode:
- 1990aiaa.meetV....J
- Keywords:
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- Error Analysis;
- Flow Velocity;
- Laser Doppler Velocimeters;
- Particle Motion;
- Two Phase Flow;
- Bluff Bodies;
- Flow Distribution;
- Navier-Stokes Equation;
- Subsonic Flow;
- Transonic Flow;
- Velocity Measurement;
- Fluid Mechanics and Heat Transfer