이동근*1)⋅조용*⋅고재명*⋅박태진*⋅박종호**2) A Study on Performance Characteristics of Wetted-type Multi Path Ultrasonic Flowmeter

Key Words: Wetted-type multi path ultrasonic flow meter(습 식 다회 선 초음파유량계), Flow-rate error(유 량 오차율), 90 ° double elbow pipe(90 ° 연 속 곡관), Gate valve(게이 트 밸브), Butterfly valve(버터플라 이 밸브) An experimental investigation has been carried out in order to evaluate characteristics of wetted-type multi-path ultrasonic flowmeters. The multi-path ultrasonic flowmeters were installed at various entrance and exit locations for several cases of pipe fitting(straight, 90 ° double elbow) and valve(gate valve, butterfly valve). We measured the flow-rate at each location. The measurement data of test flowmeter were compared with the measured data of reference flowmeter. The uncertainties of reference flowmeter and test flowmeter are 0.3 %, 0.4 %, respectively. The results demonstrate the effects of flowmeter location as well as the measurement errors in flow rate. The distance between the flow disturbance factor and a flowmeter was a