METHOD OF ULTRASONIC FLOW METERING

摘要

An ultrasonic flow measurement method according to the present invention includes a step of applying a friction coefficient of a step pipe for obtaining a line average flow rate from an ultrasonic measurement value and converting the line average flow rate into a sectional average flow rate, and a step of calculating a flow from the sectional average flow rate. The step of obtaining the line average flow rate includes a step of measuring a line flow rate in a flow direction of a fluid passing through the pipe by using an ultrasonic measurement method, and a step of obtaining the line average flow rate from the measured line flow rate. The friction coefficient of the pipe becomes zero at the central axis of the pipe and can reflect the shear stress distribution of the internal flow field of the pipe having a value on a pipe wall surface.