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Accession Number:
ADA289592
Title:
Evaluation of a New Laboratory Acoustic Doppler Velocimeter.
Descriptive Note:
Master's thesis,
Corporate Author:
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Report Date:
1994-12-01
Pagination or Media Count:
63.0
Abstract:
A small, rugged and relatively inexpensive velocity meter has been developed to measure uniform and oscillatory water flows in laboratory facilities. The Acoustic Doppler Velocimeter ADV- 1 is capable of measuring three-dimensional velocities. The ADV- 1 measures velocities from 0 to 2.5 ms at a sampling rate of up to 25 Hz. The measurements are made in a sampling volume located 5 cm in front of the probe. Since this instrument is new, the objective is to compare the ADV-1 with other laboratory current meters and prepare operational guidelines for the ADV-1 system. Three-dimensional velocities are measured in a wave tank with the ADV-1 horizontal velocity average 0.9 cms higher than the laser Doppler anemometer LDA and the ADV-1 vertical velocity average 0.93 cms lower than the LDA. A horizontal velocity profile is measured in a wave flume by the ADV-1 and a pitot tube, and the instruments differ by 3.5 . Measuring velocity profiles around a stationary cylinder with the ADV-1 in the wave flume was highly successful, showing the ability of this instrument to measure velocities near structures in future laboratory research. The ADV-1 is portable and can be used for extended periods without recalibration. jg
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
