Study on vibration phenomena of guide vane inside bend by fluid structure interaction analysis

Vibration phenomena of a guide vane seem to be generated by a fluid exciting force working on the guide vane in unsteady flow field. Thus, in order to understand the vibration mechanism of the guide vane, it is important to reveal unsteady field inside a bend having the guide vane. In this paper, vibration phenomena of the guide vane inside the bend were considered by using numerical simulation. In order to decide analysis conditions of Large Eddy Simulation (LES), the results of LES were compared to the ones of Particle Image Velocimetry (PIV) for the downscaling model. Moreover, Fluid-Structure Interaction (FSI) analysis was conducted for the mitre bend having the guide vane modelled in actual scale. As a result, stress fluctuation at the centre of the trailing edge of the guide vane was largest. This result indicates that vibration phenomena are possible to occur on the trailing edge of the guide vane.