Turbulence measurements with Acoustic Doppler Velocimeters

GARCÍA, C.M.; CANTERO, M.I.; NIÑO, Y.; GARCÍA M.H.

JOURNAL OF HYDRAULIC ENGINEERING

ASCE Publications

Lugar: Reston, Virginia, Estados Unidos; Año: 2005 vol. 131 p. 1062 - 1073

0733-9429

The capability of acoustic Doppler velocimeters to resolve flow turbulence is analyzed. Acoustic Doppler velocimeter performance curves APC are introduced to define optimal flow and sampling conditions for measuring turbulence. To generate the APCs, a conceptual model is developed which simulates different flow conditions as well as the instrument operation. Different scenarios are simulated using the conceptual model to generate synthetic time series of water velocity and the corresponding sampled signals. Main turbulence statistics of the synthetically generated, sampled, and nonsampled time series are plotted in dimensionless form APCs. Therelative importance of the Doppler noise on the total measured energy is also evaluated for different noise energy levels and flow conditions. The proposed methodology can be used for the design of experimental measurements, as well as for the interpretation of both field and laboratory observations using acoustic Doppler velocimeters.