Turbulence measurements with acoustic doppler velocimeters

Carlos M. García, Mariano I. Cantero, Yarko Niño, Marcelo H. García

Research output: Contribution to journalArticle

Abstract

The capability of acoustic Doppler velocimeters to resolve flow turbulence is analyzed. Acoustic Doppler velocimeter performance curves (APCs) 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). The relative 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.

Original languageEnglish (US)
Pages (from-to)1062-1073
Number of pages12
JournalJournal of Hydraulic Engineering
Volume131
Issue number12
DOIs
StatePublished - Dec 1 2005

Keywords

  • Doppler systems
  • Filters
  • Flow measurement
  • Noise
  • Turbulent flow

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology
  • Mechanical Engineering

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