GS03 Development of high flow-rate measurement using ultrasonic velocity profile method

A multi-beam pulse ultrasonic Doppler method has been developed for a new type of flow metering system. This new system is a hybrid of the time-of-flight type ultrasonic flowmeter and the ultrasonic velocity profile type flowmeter, having the advantages of these two types. Our final purpose is to apply the hybrid ultrasonic flow metering system to an accurate flow rate measurement of feed- or recirculation- water in nuclear power plants. The pulse ultrasonic Doppler method (UDM) has the capability to obtain instantaneous velocity profiles along an ultrasonic beam. The principle of the UDM flowmeter, which is one of the ultrasonic velocity profile type flowmeters, is based on the integration of an instantaneous velocity profile over a pipe diameter. The multi-beam system is expected to eliminate installation problems such as those of entry length, and also to follow transient flow rate more precisely by increasing the number of ultrasonic transducers. However, it needs reflectors for receiving ultrasonic Doppler signals. On the other hand, the time-of-flight (TOF) ultrasonic flow metering system does not need any reflector, but it needs profile factors (PFs) which depend on velocity profiles. PF is one of the important experimental coefficients for the accurate flow rate measurement. Therefore PFs must be corrected according to the changes in flow conditions. In the present study, we investigated to what degree the hybrid ultrasonic flow metering system can adjust the profile factors of the time-of-flight ultrasonic flow meters by using the multi-beam pulse ultrasonic Doppler method in metallic wall piping.

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ICOPE-15-1040 A new method for high flow rate measurement using ultrasonic multi-wave pulsed Doppler method with staggered trigger

The Proceedings of the International Conference on Power Engineering (ICOPE) ◽

10.1299/jsmeicope.2015.12._icope-15-_27 ◽

2015 ◽

Vol 2015.12 (0) ◽

pp. _ICOPE-15--_ICOPE-15-

Author(s):

Ei MURAMATSU ◽

Hideki MURAKAWA ◽

Katsumi SUGIMOTO ◽

Nobuyuki TAKENAKA ◽

Noriyuki FURUICHI

Keyword(s):

Flow Rate ◽

High Flow ◽

High Flow Rate ◽

New Method ◽

Pulsed Doppler ◽

Rate Measurement ◽

Flow Rate Measurement ◽

Doppler Method

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Study on the Optimal Number of Transducers for Pipe Flow Rate Measurement Downstream of a Single Elbow Using the Ultrasonic Velocity Profile Method

Science and Technology of Nuclear Installations ◽

10.1155/2012/464313 ◽

2012 ◽

Vol 2012 ◽

pp. 1-12 ◽

Cited By ~ 3

Author(s):

Sanehiro Wada ◽

Kenichi Tezuka ◽

Weerachon Treenuson ◽

Nobuyushi Tsuzuki ◽

Hiroshige Kikura

Keyword(s):

Velocity Profile ◽

Ultrasonic Velocity ◽

Flow Rate ◽

Estimation Method ◽

Velocity Profiles ◽

Optimal Number ◽

Wave Number ◽

Pipe Diameter ◽

Rate Measurement ◽

Flow Rate Measurement

This paper presents a new estimation method to determine the optimal number of transducers using an Ultrasonic Velocity Profile (UVP) for accurate flow rate measurement downstream of a single elbow. Since UVP can measure velocity profiles over a pipe diameter and calculate the flow rate by integrating these velocity profiles, it is also expected to obtain an accurate flow rate using multiple transducers under nondeveloped flow conditions formed downstream of an elbow. The new estimation method employs a wave number of velocity profile fluctuations along a circle on a pipe cross-section using Fast Fourier Transform (FFT). The optimal number of transducers is estimated based on the sampling theorem. To evaluate this method, a preliminary experiment and numerical simulations using Computational Fluid Dynamics (CFD) are conducted. The evaluating regions of velocity profiles are located at 3 times of a pipe diameter () for the experiment, and 1 and for the simulations downstream of an elbow, respectively. Reynolds numbers for the experiment and simulations are set at and , respectively. These results indicate the efficiency of this new method.

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