Wind tunnel experiments were conducted on a series of two-dimensional perforated plates normal to an air stream to study the characteristics of unsteady wake pressures and to ascertain the parameters amongst which a certain level of correlation can be established. The velocity ranged from 5 m/s to 15 m/s in the present study. The pressure field gets significantly modified as the perforation level increases. The present study is concerned with three plates with perforation level of 0%, 25% and 35%. There appears to be a correlation between the maximum normalized value of the RMS pressure fluctuation levels, base pressure and the perforation level of the normal plate.

Yaragal, S.C.Govinda Ram, H.S.Tamura, Y.2026-02-05ExperimentJournal of the Institution of Engineers (India): Civil Engineering Division, 2005, 86, NOV., pp. 109-1123731995https://idr.nitk.ac.in/handle/123456789/279062005Bleed flowsTwo dimensional platesUnsteady characteristicsWake pressuresCorrelation methodsParameter estimationPlates (structural components)Pressure measurementWakesWind tunnelsWind tunnel experiments were conducted on a series of two-dimensional perforated plates normal to an air stream to study the characteristics of unsteady wake pressures and to ascertain the parameters amongst which a certain level of correlation can be established. The velocity ranged from 5 m/s to 15 m/s in the present study. The pressure field gets significantly modified as the perforation level increases. The present study is concerned with three plates with perforation level of 0%, 25% and 35%. There appears to be a correlation between the maximum normalized value of the RMS pressure fluctuation levels, base pressure and the perforation level of the normal plate.