Book description
In fluid mechanics, velocity measurement is fundamental in order to
improve the behavior knowledge of the flow. Velocity maps help us to
understand the mean flow structure and its fluctuations, in order to
further validate codes.
Laser velocimetry is an optical technique
for velocity measurements; it is based on light scattering by tiny
particles assumed to follow the flow, which allows the local fluid
flow velocity and its fluctuations to be determined. It is a widely
used non-intrusive technique to measure velocities in fluid flows,
either locally or in a map.
This book presents the various
techniques of laser velocimetry, as well as their specific qualities:
local measurements or in plane maps, mean or instantaneous values, 3D
measurements. Flow seeding with particles is described with currently
used products, as well as the appropriate aerosol generators.
Post-processing of data allows us to extract synthetic information
from measurements and to perform comparisons with results issued from
CFD codes. The principles and characteristics of the different
available techniques, all based on the scattering of light by tiny
particles embedded in the flow, are described in detail; showing how
they deliver different information, either locally or in a map, mean
values and turbulence characteristics.
