고레이놀즈수에서의 유량측정 정확도

다국어 초록 (Multilingual Abstract)

Calibration facility at high Reynolds number flow was designed and fabricated, for calibrating the flowmeter used for feedwater flow measurement in a nuclear power plant. Conditions of the feedwater flow are under the temperature 230 ℃ and the pressure 8 M Pa. Four ultrasonic flowmeters, which have 3000 m3/h maximum flowrate respectively, were calibrated against both gravimetric flow calibrator and pipe type ball prover. We have achieved the maximum flowrate 12000 m3/h with parallelly connected four ultrasonic flowmeters. To get the high Reynolds number flow, the fluid temperature was controlled up to 90 ℃. Then we can get Reynolds number 2.5x107, which was coincide with that of APR 1400(Advance Power Reactor 1400 ㎿) nuclear power plant model. Two different principle flow calibrator, gravimetric system and ball prover, which have the traceability from national standard of mass and volume respectively, were crossly used and checked for the estimation of ultrasonic flowmeters. The target uncertainty of this calibrator was 0.08 %, which was estimated with ISO recommendations. For increasing the reliability of estimated uncertainty, the inter comparison with other calibrator at high Reynolds number was planned. The system will be apply to solve the MUR(Measurement Uncertainty Recapture) issue in feedwater flow measurement.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 연구배경
• 3. 교정설비의 건설
• 4. 유량시험 및 불확도 추정
• 5. 결론
• 참고문헌