Ultrasonic methods for determining flows and velocity fields

Abstract

This paper introduces research and development of a modern non-invasive device for determining flows and velocity fields. This device is based on the ultrasonic method. The measured fluid flow is surrounded by appropriate ultrasonic transmitters and receivers, which communicate with each other. A physical principle of this method consists in an interaction of sound waves with a flow, which generates a certain delay in sound waves transmission. The found quantity is thus time delay. The device is being designed as a flowmeter and with advanced and extended postprocessing as a tomograph, which reconstructs a 3D vector field for big volumes. This whole process requires the following: development of an appropriate design of the ultrasonic flowmeter and tomograph, testing the signal transfer and also various postprocessing methods on a measurement accuracy, building of a special verification experimental equipment and building of an electronic device as a control unit and data acquisition system.

Demonstration of Non-Uniformity of Velocity Profiles Using 2D PIV

“…The obtained 2D vector maps were analyzed in several cross-section lines, illustrated in Figure 4. The horizontal position x of the cross-sections was defined with respect to the dimensions of the ultrasonic flowmeter prototype [1], with 200 mm in length measured from the inlet. The combination of the flowmeter geometry and PIV data leads to the selection of the cross-section at the beginning of the measuring area X100, then the final position of the flowmeter X205, and finally the cross-section X152.5 in the middle.…”

“…This paper builds on a previous publication by Barraclough et al [1], which describes the development of the ultrasonic flowmeter itself. Two methods of measuring flow with ultrasonic probes are being developed to measure flow independently of flow quality.…”