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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. [Projekat Ministarstva nauke  Republike Srbije, br. TR 35046

Estimation of laser-Doppler anemometry measuring volume displacement in cylindrical pipe flow