Effect of transverse perforations on fluid loading on a long, slender plate at zero incidence

Journal of Hydrology and Hydromechanics

Bossi Filippo Carlo¹  Malavasi Stefano¹  Barannyk Oleksandr²  Rahimpour Mostafa²  Oshkai Peter² 

[1] Department of Civil and Environmental Engineering, Hydraulic Section, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133, Milano, Italy;Department of Mechanical Engineering, Institute for Integrated Energy System, P.O. Box 1700, Stn. CSC, Victoria, BC V8W 2Y2, Canada;

关键词: perforated plate;    flow-induced loading;    flow-induced vibration;   

DOI  :  10.1515/johh-2017-0025

来源: DOAJ

【 摘 要 】

This paper reports the results of experimental investigations of flow-induced loading on perforated and solid flat plates at zero incidence with respect to the incoming flow. The plates had a streamwise length to transverse thickness ratio of 23.5. The effect of the perforations was investigated for three different perforation diameters. The results corresponding to the perforated plates were compared with the reference case of the solid plate (no perforations) at five inflow velocities. We quantified the effect of the perforations on the unsteady fluid loading on the plate in terms of the variations of the corresponding Strouhal number, the mean drag coefficient and the fluctuating lift coefficient as functions of the Reynolds number and the perforation diameter. The results indicate that the loading was dominated by the dynamics of the wake. In particular, increasing the perforation diameter resulted in a wider wake, corresponding to the increase in mean drag coefficient and the decrease in the Strouhal number. Onset of coupling between the vortex shedding and the transverse oscillations of the plate was manifested as a rapid increase in the fluctuating lift coefficient, as the perforation diameter exceeds the plate thickness.

【 授权许可】

Unknown