Evaluation of a New Laboratory Acoustic Doppler Velocimeter.
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 m/s 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 cm/s higher than the laser Doppler anemometer (LDA) and the ADV-1 vertical velocity average 0.93 cm/s 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1994
- Accession Number
- ADA289592
Entities
People
- Gary N. Underwood
Organizations
- Naval Postgraduate School