Seeding Gas Flows for Laser Anemometry,
CRANFIELD INST OF TECH (ENGLAND) SCHOOL OF MECHANICAL ENGINEERING
Pagination or Media Count:
This paper reviews the seeding of gas flows for laser anemometry. The specification and determination of the size of seeding particles to ensure both an adequate response to velocity charges of the flowing medium and a sufficient light scattering capability are examined critically. A compromise between these conflicting criteria is generally given as an upper limit on acceptable particle size, expressed as the diameter of an equivalent spherical particle. Problems arise in defining and quantifying this equivalent diameter, generating particles of suitable size from a given material, measuring the particle size distribution at the generator exit, and determining the size distribution actually seen by the laser anemometer. Recommendations are made for particle generators, sizing methods, and interpreting the significance of quoted particle distributions for laser anemometry purposes.
- Fluid Mechanics
- Test Facilities, Equipment and Methods