Pressure Pulsation Caused by Vortex Shedding from a Perforated Plate with Holes : Effects of Parameters on Lock-in Phenomenon

Abstract

The pressure fluctuation caused by the ring vortex shedding from a perforated plate with holes installed in a pipe was investigated experimentally.Measurements were made using pressure transducers at Reynolds numbers from 6.74×103 to 4.02×104 based on the velocity at the hole.A significant lock-in phenomenon is caused by the flexural rigidity of the perforated plate.When this phenomenon occurs, the amplitude of the pressure fluctuation increases markedly.While the velocity range generating the lock-in phenomenon shifts to a higher velocity as the plate thickness increases, the frequency of the pressure pulsation is independent of it.It was also found that the pipe length both upstream and downstream of the plate exerts a major influence.