Abstract
This study describes an ultrasonic velocity profiler that uses a new ultrasonic array transducer with unique 5-element configuration, with all five elements acting as transmitters and four elements as receivers. The receivers are designed to reduce the amount of uncertainty. As the fluid moves through this setup, four Doppler frequencies are obtained. The multi-dimensional velocity information along the measurement line can be reconstructed. The transducer has a compact geometry suitable for a wide range of applications, including narrow flow areas. The transducer’s basic frequency and sound pressure are selected and evaluated to be compatible with the application. First, to confirm the measurement ability, the measurement of the developed system in two-dimensional flow is validated by comparing it to the theoretical data. The uncertainty of measurement was within 15%. Second, the three-dimensional measurement in turbulent and swirling flow is proved experimentally to check the applicability of the proposed technique.
Highlights
The visualization of flow field or velocity distribution is a critical task in fluid engineering
This study describes an ultrasonic velocity profiler that uses a new ultrasonic array transducer with unique 5-element configuration, with all five elements acting as transmitters and four elements as receivers
This paper proposes a Ultrasonic Velocity Profiler (UVP) measurement system with a five-element array transducer to measure multi-dimensional velocity profiles, whether two-dimensional or three-dimensional
Summary
The visualization of flow field or velocity distribution is a critical task in fluid engineering. Ultrasonic Velocity Profiler (UVP) is a non-invasive measurement that does not require optical access and can work among opaque fluid It has a broad range of applications. Peronneau et al [11] proposed a single element cross beam system that uses two transducers as a transceiver that works transmitter and receiver respectively to measure two-dimensional velocity (2D) at the cross-point. This system can only obtain 2D velocity at one point, and requires mechanical adjustment to gather velocity data at other points. This paper proposes a UVP measurement system with a five-element array transducer to measure multi-dimensional velocity profiles, whether two-dimensional or three-dimensional. The 3D velocity profile measurement in turbulent and swirling flow is demonstrated experimentally
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