615 湿り蒸気流中の液滴が分岐管の共鳴周波数に及ぼす影響

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タイトル別名
  • 615 Influence of Droplets on Resonance Frequency of Branch Piping in Wet Steam Flow

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Flow-induced acoustic resonances of steam piping system containing closed side-branches are one of the phenomena which cause fatigue damage of piping or components in power plants. In the United States, the steam dryer in boiling water reactor had been damaged by high cycle fatigue due to acoustic-induced vibration under a power uprating condition. It is important to evaluate resonance frequency of branch piping, which is one of the parameters for Strouhal number as resonant condition, for design of piping system or prevention of fatigue damage in power plants. Steam piping systems of actual power plants often have wet steam condition (also nearly saturated wet steam condition). Although there are several previous studies about acoustic resonance, most of them are not steam flow but air flow. Authors have been investigated the acoustic resonance under each dry and wet steam flow by conducting experiments under low pressure in single branch. It was clarified that resonance frequency under wet steam could be predicted from theoretical equation as the first mode quarter-wave frequency of branch piping depth with an end correction and sound speed which was assumed to be saturated condition where the range of steam quality was 0.90 < x < 1.0. However, influence of droplets under wet steam flow on resonance frequency is not clarified qualitatively yet. In this study, we conducted theoretical analysis which considered motion of droplets. As a result, the effect of droplets on resonance frequency under wet steam was discussed.

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詳細情報 詳細情報について

  • CRID
    1572824502344340608
  • NII論文ID
    110010054294
  • NII書誌ID
    AA11901770
  • ISSN
    13480235
  • 本文言語コード
    ja
  • データソース種別
    • CiNii Articles

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