Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
THE PRESSURE AND VELOCITY FLUCTUATIONS AFTER A ROW OF CYLINDERS IN FLOW WITH TURBULENCE INTENSITY VARIATION
Submission Author:
Roberta Fatima Neumeister , DF
Co-Authors:
Murillo Centenaro, Sergio Viçosa Möller
Presenter: Roberta Fatima Neumeister
doi://10.26678/ABCM.ENCIT2016.CIT2016-0232
Abstract
The present experimental study analizes the velocity and pressure fluctuations in the wake of smooth cylinder row with diameter of 25.1 mm and spacing ratio of 1.26 submitted to a constant velocity air flow. Analysis is executed with signals obtained from flows with turbulence intensity equal to 1% and 11% and Reynolds number equal to 2.6 x 104, based on the cylinder diameter and free flow velocity. The velocity signals are obtained using hot-wire anemometry technique and the pressure fluctuations using condenser microphones, positioned on the wall of the aerodynamic channel in two positions of the wake. Data are correlated and evaluated by continuous wavelets and Fourier analysis. Results show that the increase on the turbulence intensity impacts on the wake dispersion, which, due the momentum increase, reduces the downstream wake length, but does not changes the flow main characteristics.
Keywords
cylinders, Turbulent flow, Pressure flutuations, Velocity flutuations
