Background: In recent years some reactors have experienced significant steam dryer cracking.Studies indicate that the fatigue is due to flow-induced acoustic vibration.Purpose: In this study

sound source behaviors of a single valve on the main steam line are investigated.Methods: Mode and CFD analysis were carried to investigate the acoustic mode and resonance behaviors.Results: The following results can be concluded from this study: various categories of acoustic modes exist in the structure;geometries directly influence acoustic mode;peak excitation occurs around St of some specifically range.Conclusions: The results match theory and experimental studies well

and provide reference for the related researches.