Laser-Doppler anemometry application in measurements of the 3-D swirl
turbulent flow velocity in the cylindrical pipe, behind the axial fan, have
been analysed. This paper presents a brief overview of uncertainty sources in
the laser-Doppler anemometry measurements. Special attention is paid to
estimation of laser-Doppler anemometry measuring volume positioning in
cylindrical pipe flow due to optical aberrations, caused by the pipe wall
curvature. The hypothesis, that in the central part of the pipe (r/R < 0.6)
exists a small, or negligible pipe wall influence on laser- -Doppler
anemometry measuring position, is investigate. The required corrections, for
measurements of axial, tangential, and radial velocity components such: shift
of measuring volume and its orientation are analyzed and determined for used
test rig and for some other pipe geometries.