Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Design of a Low-Speed, Closed Test-Section Wind-Tunnel for Aeroacoustic and Low-Turbulence Experiments
Submission Author:
Filipe Amaral , SP
Co-Authors:
Juan Carlos Serrano Rico, Filipe Amaral, Christian Bresci, Marcello Augusto Faraco de Medeiros
Presenter: Marcello Augusto Faraco de Medeiros
doi://10.26678/ABCM.COBEM2017.COB17-2591
Abstract
This paper shows an overview of design criteria and facility specifications of the low-speed, closed circuit wind-tunnel located at the University of Sao Paulo, Sao Carlos School of Engineering (USP-EESC). Experimental investigations of flow-induced sound and sources of sound require an adequate environment of low-background acoustic noise and low-turbulence flow. The new wind-tunnel includes features intending to improve the flow-quality through the reduction of turbulent and acoustic disturbances and an increased flow uniformity. Such features suit the wind-tunnel for pure aerodynamic characterization as well as for aeroacoustic experiments. A long settling chamber, an hexagonal honeycomb and five nylon screens were included to minimize flow disturbances in the test-section. The turning vanes are filled with insulation, aiming the reduction and absorption of unwanted noise, whereas dense foam were installed on the corners walls, floor and ceiling to provide secondary means of background noise suppression. The wind-tunnel endue a closed test-section of 1000 × 1000 mm cross-sectional area and 3000 mm length, with 7 : 1 contraction ratio. A variable-speed DC motor of 110 kW powers a 13-bladed axial fan containing 6 stators and the expected maximum flow-speed in the test-section is 60 m/s. The wind-tunnel measurement instrumentation includes a Microphone Phased Array, Particle Image Velocimetry and Hot-Wire Anemometry.
Keywords
Wind Tunnel, Aerodynamics, Aeroacoustics, Low-turbulence
