大口径エルボ管の流動励起振動に関する研究 : 第1報:流動状況と圧力変動特性(J13-6 流体関連振動III,J13 流体関連の騒音と振動)

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  • Flow-induced Vibration of Large-diameter Elbow : (1) Flow Pattern and Pressure Fluctuation

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A flow-induced vibration test facility that simulates a hot leg piping of the Japanese sodium-cooled fast reactor (JSFR) with 1/3 scale is used to investigate the flow pattern and pressure fluctuations of the pipe. As the observation of flow pattern, the velocity distributions measured by LDV show the flow pattern is independent of Reynolds number at high Reynolds number. The maximum velocity is about 15 times the mean velocity in the elbow. A statistical analysis of the pressure fluctuations in a separation region shows the power spectrum is of white noise up to 20Hz, the autocorrelation sharply drops to zero less than 1 sec of time interval and the probability density distribution figures almost the Gaussian distribution, excepting its flatness-3 is 3.

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