報告書番号

285085

タイトル（和文）

斜交流場における中間熱交換器伝熱管の振動－流動状態と振動の関係の検討－

タイトル（英文）

INTERMEDIATE HEAT EXCHANGER TUBE VIBRATION INDUCED BY CROSS AND PARALLEL MIXED FLOW -ESTIMATION OF RELATIONSHIP BETWEEN FLOW DISTRIBUTION AND VIBRATION-

概要 （図表や脚注は「報告書全文」に掲載しております）

ＦＢＲタンク型炉中間熱交換器はバッフルプレートを設け，胴側冷却材に直交流成分を加えた熱流動設計がとられるため，伝熱間はバッフルプレートのフローホールによる平行噴流と直交流が混合した様々な斜交流にさらされることになる。斜交流においても流動状態によっては，流力振動に起因する伝熱管の疲労やフレッティング等の損傷障害の発生も考えられ，伝熱管の振動を検討しておく必要がある。本報告では，斜交流場における胴側冷却材の流動状態と伝熱交換器の振動を統一的に評価する基本的な手法を求めた。

概要 （英文）

THE CHARACTERISTICS OF POOL TYPE LMFBR INTERMEDIATE HEAT EXCHANGER (IHX) TUBE VIBRATION BY CROSS AND PARALLEL MIXEDFLOW WERE INVESTIGATED IN A FASIWAY. THE SECONDARY COOLANT IN IHX TUBEBUNDLE IS A MIXED FLOW OF PARALLEL JET FLOW ALONG THE TUBE AXIS THROUGH FLOW HOLES IN BAFFLE PLATES AND CROSS FLOW. BY CHANGING THESE TWO FLOW RATES, FLOW DISTRIBUTIONS VARY IN THE TUBE BUNDLE. THE MIXED FLOW ALSO INDUCES VIBRATIONS WHICH CAUSE THE FRETTING WEAR AND FATIGUE OF A TUBE. IT IS THEREFORE VERY IMPORTANT TO EVALUATE THE TUBE VIBRATION CHARACTERISTICS FOR ESTIMATING THE TUBE INTEGRITY. THE RESULTS SHOW THAT THE RELATIONSHIPS BETWEEN TUBE VIBRATIONS AND FLOW DISTRIBUTIONS IN THE TUBE BUNDLE WERE CLEARED, AND MIXED-FLOW-INDUCED TUBE VIBRATION COULD BE EVALUATED ON THE BASIS OF THE CHARACTERISTICS OF BOTH PARALLEL AND CROSSFLOW INDUCED VIBRATION. FROM THESE INVESTIGATIONS, IT COULD BE CONCLUDED THAT THE CHARACTERISTICS OF TUBE VIBRATION FOR VARIOUS FLOW DISTRIBUTIONS CAN BE EVALUATED SYSTEMATICALLY.

報告者

キーワード