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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
UNBALANCED FREE TO OSCILLATE TANDEM CYLINDERS IN A TURBULENT CROSSFLOW
Submission Author:
Patrick Habowski , RS , Brazil
Co-Authors:
Patrick Habowski, Guilherme Henrique Fiorot, Alexandre Vagtinski de Paula, Sergio Viçosa Möller
Presenter: Patrick Habowski
doi://10.26678/ABCM.ENCIT2020.CIT20-0371
Abstract
This article presents an experimental study in an aerodynamic channel using two circular cylinders in tandem position. The two cylinders are positioned between two circular tables aligned with the walls of the aerodynamic channel. The first cylinder is centered while the second is positioned at a distance given by a p/d spacing ratio = 1.26. The set shaft is provided with low friction bearings. When subjected to a transversal flow, the set aligns in a tandem configuration with the flow and begins to oscillate. Hot wire anemometry technique was employed with the wavelet analysis to evaluate the results of velocity and energy content of the wake flow. The angular movement of the system was analyzed using a high-speed camera. Matlab and Tracker software were used to generate time series of the angular position of the cylinder oscillation. Time series of three proposed cases of velocity and angular position were analyzed. In each case, three velocities were imposed. Two cases involved the insertion of obstacles to accelerate the flow close to the cylinders, while the remaining one was carried out without obstacles. Results showed velocity fluctuations due the oscillatory movement developed by the setup, presenting higher levels of velocity for the cases with obstacles. The energy content analysis presented higher levels of energy where the experiment has the higher levels of velocity and velocity fluctuations. Angular position analysis pointed out the oscillatory movement developed by all the three cases.
Keywords
: aerodynamic channel, hot wire anemometry, Tandem cylinders, Turbulent flow, wavelets
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