Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
Investigation of Flow Patterns in Finite Cylinders
Submission Author:
Henrique Leite , PR
Co-Authors:
Ana Cristina Avelar
Presenter: Henrique Leite
doi://10.26678/ABCM.ENCIT2016.CIT2016-0667
Abstract
The flow patterns over finite cylinders will be analyzed experimentally in a subsonic wind tunnel using the techniques of Time Resolved Particle Image Velocimetry (TR-PIV) and Pressure sensitive paint (PSP). The measurements are being carried out in the TA-3 wind tunnel, which is a closed circuit wind tunnel with an open test section. The maximum speed through its empty test section is around 38m/s and the turbulence level around 2%. The near wake flow structures, vortex shedding characteristics and surface pressure will be investigated for two different aspect ratios, 3 and 6. Tests were performed at speeds from 10m/s to 30m/s, with cylinders with circular and square cross sections. The cylinders diameters are 20mm. For the wind tunnel tests, the cylinders will be fixed on a blunt flat plate in order to reduce the boundary layer thickness and consecutively its interaction with the cylinder wake. The cylinders are instrumented also with pressure taps for comparison with PSP data. The 2D PIV measurements will be conducted in vertical and horizontal planes, including regions close to the flat plate, in order to investigate interactions between the wake and the boundary layer. Due to the complexity of the phenomena, the flow will be characterized in terms of both average behavior and time-resolved velocity fields. The aim of this work is to understand the flow patterns around the cylinder and the pressure fluctuations on the wall and flow structure coupling by relating the two-dimensional velocity field with pressure field obtained with PSP.
Keywords
PIV method application, Pressure Sensitive Paint, Finite Cylinders, Unsteady Flow, Time Resolved PIV
