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Application of noncontact type of ultrasonic flowmeter for high temperature LBE flow

高温LBE流れに対する非接触式超音波流量計の適用

大林 寛生  ; 八巻 賢一*; 北 智士*; 有吉 玄  ; 佐々 敏信   

Obayashi, Hironari; Yamaki, Kenichi*; Kita, Satoshi*; Ariyoshi, Gen; Sasa, Toshinobu

原子力機構では、LBE流れに対し円管外に2つのセンサーを設置する非接触式の超音波流量計を開発した。解決すべき課題は計測配管内での信号の多重反射と固液界面での濡れ性である。これらに対し、固体-固体境界での臨界角の採用と配管内面に対する鏡面仕上げの改善による対応を実施した。350$$^{circ}$$Cの温度条件における適用試験では、LBE流れに対する有用性が既に実証されているプラグ挿入式に相当する性能を示すことを明らかにするとともに、1500時間以上安定的な信号出力が得られることを実証した。

JAEA developed a non-contact type flowmeter that two ultrasonic sensors were installed on outer surface of a cylindrical-shaped test section. The considerable issue of the realization was multiple reflection of emitted signal in the piping. Furthermore, wettability between LBE and inner surface of the test section was one of the important issue on the ultrasonic technique. To mitigate the multiple reflection, a critical angle as an incident angle not to produce a longitudinal wave on the solid / solid boundary was applied. And fine mirror-finished treatment was applied to the inner surface of the test section to ensure wettability. As a result of experiment at 350 degrees C, the observed correlation value between the non-contact type and the established plug type was 0.9986. Additionally, the developed non-contact type provided its sufficiently stable output during a long-term test more than 1,500 hours.

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