The Effect of profile of inlet velocity on the pressure fluctuation on the inside wall of short-elbow

小野 綾子; 田中 正暁; 小林 順; 上出 英樹

Proceedings of 9th Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-9) (CD-ROM), 7 Pages, 2014/11

The flow induced vibration (FIV) is concerned at the hot-leg piping of JSFR because of large Reynolds number in it. The pressure fluctuation in the piping causes FIV as the excitation force, which relates to velocity fluctuation. In this study, the measurement of pressure fluctuation in the elbow piping revealed that inlet velocity condition affect to the area of separation flow and the pressure fluctuation generated by the traversing of separation region. And, the measurement revealed that the pressure fluctuation with higher frequency significantly attenuated during the flow passed in the elbow.