Abstract
Procedures are discussed for measuring two-point correlations in complex turbulent flows with laser Doppler anemometry. Recommendations are presented on the LDA design to minimize systematic uncertainties originating in the optics and the signal processing, and particularly to eliminate the effect of uncorrelated noise. These procedures are illustrated by correlation coefficient curves measured in the shear layers of isothermal and combusting flows. A high-quality measuring system is shown to be necessary to obtain reliable correlation coefficient curves, although the interpretation of these curves and the corresponding turbulence length scales in spatially non-uniform flow fields remains problematic.
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