Flow Velocity Measurement Using a Spatial Averaging Method with Two-Dimensional Flexural Ultrasonic Array Technology.

Area of Science:

• Fluid dynamics
• Ultrasonic measurement technology
• Industrial instrumentation

Background:

• Accurate average flow velocity is critical for industries like automotive, chemical, and oil/gas.
• Current ultrasonic transit-time methods face accuracy limitations due to turbulence, swirls, and meter errors.
• Existing methods struggle with inherent fluid dynamic effects and systematic errors.

Purpose of the Study:

• To introduce a novel spatial averaging method for enhanced ultrasonic flow velocity measurement.
• To improve the accuracy and reduce the uncertainty of average flow velocity determination.
• To overcome limitations of conventional ultrasonic flow measurement techniques.

Main Methods:

• Development of a novel two-dimensional flexural ultrasonic array transducer with eight elements.
• Implementation of a spatial averaging technique utilizing the array transducer.
• Distribution of transducer paths across two chordal planes adjacent to a diametral plane.

Main Results:

• The spatial averaging method achieved a root-mean-square deviation of 2.94% for average flow velocity.
• Individual paths showed higher deviations, ranging from 3.65% to 8.87% (average 6.90%).
• The proposed method significantly reduces measurement uncertainty compared to individual path measurements.

Conclusions:

• The flexural ultrasonic array transducer and spatial averaging method enhance ultrasonic flow measurement accuracy.
• This technology offers advantages for both single-path and multi-path ultrasonic flow meters.
• The findings are expected to advance ultrasonic flow measurement in diverse industrial applications.