Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 05, 2021 - September 08, 2021
Clamp-on ultrasonic flowmeter is a powerful tool for measuring flow rate in an existing pipes. However, measuring flow rate of wet steam flow has not been established yet. It is important to investigate the various error factors caused by the wetness fraction. The authors investigated the effects of sound speed and the void fraction in the wet steam flow using an ultrasonic flow meter. The results show that flow rates in wet steam could be determined within a 10 % error under general conditions in a steam piping system, although the conversion factor from line-average to area-average velocities was calibrated in superheated conditions, and the speed of sound in saturated conditions at each pressure was used. However, the error of the flow rates tended to increase with the wetness fraction and was biased toward positive values. The speed of sound and liquid volume fraction were evaluated at different wetness fractions.
