22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-5.1.2

IMPLEMENTATION OF A 3D LDA SYSTEM FOR THE MEASUREMENT OF TURBULENT QUANTITIES IN COMPLEX TURBOMACHINERY FLOWS-DEMONSTRATION OF PERFORMANCE IN AN AXISYMMETRIC FREE JET

G. Simeonides, V. Zaphirakis, K. Mathioudakis
National Technical University of Athens, Greece

Keywords: laser doppler anemometry, turbulence, shear stresses, jet flow, turbomachinery

In the present paper a study for improving a 3D measurement technique using Laser Dopler Anemometry (LDA) is presented. A 3D LDA system developed for measurements in turbomachinery components is used for the investigation. The sensitivity of the measurement procedure on small errors in aligning the laser optics is demonstrated and it is shown that by using an improved alignment method it is possible to improve the accuracy of the measurements. The effect of coincidence window size on data rates during the experiments is also studied. Measurement data obtained on a free jet configuration are used to demostrate that the measurement procedure presented can be used to obtain sound mean flow velocity and turbulence data.

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