Using the advantages of optical, non-intrusive laser techniques, the influence of different flow conditions in front of and inside mechanical water meters on the meters'metrological behavior is studied. The investigations are focused on the comparison of three-dimensional velocity distributions measured by Laser-Doppler-Anemometers (LDA) with the corresponding water meter error curves at ideal and disturbed flow profiles and at different flowrates. The concrete technical solutions as well as the optimized LDA data processing and presentation are explained. Beside qualitative descriptions of flow patterns by means of various 2D- and 3D-diagrams, dimensionless parameters are defined to realize a quantitative characterization of the flows investigated with the aim to develop a model which allows the understanding of, and - if possible - the prediction of changes in the corresponding water meter readings.
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Wendt, G. (2014). Investigation and characterization of water meter behavior under different flow conditions. OIML Bulletin, 45(4), 5–14.
