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ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
DESIGN AND IMPLEMENTATION OF AN AERODYNAMIC BALANCE AND VALIDATION BY ANALYZING AIRFOILS IN A SUBSONIC WIND TUNNEL
Submission Author:
Daniel Martínez , Paraguay , Paraguay
Co-Authors:
DARIO ALVISO, Igor Alejandro Fleischer, CESAR MEAURIO
doi://10.26678/ABCM.ENCIT2016.CIT2016-0163
Abstract
In the present work, we describe the construction of an aerodynamic external force balance for a subsonic wind tunnel, and its implementation by means of an automation of the equipment and data acquisition scheme. Experiments were carried out, performing measurements of lift and drag forces over several airfoil configurations, at different angle of attacks as well as different Reynolds numbers. Validations were made by numerical analysis using CFD software. The results obtained from experiment and numerical modeling were compared. Variations on tail end geometry are studied to determine effects on the drag and lift coefficient curves and aerodynamic efficiency. The airfoils analysed are the symmetric NACA 0012, -0018 and the EPPLER 193 of a chord length of 70mm. with variations of the trailing edge besides the original, truncated at 20% of the chord and truncated and rounded at 20% of the chord. The purpose of these modifications is to determine if any of them are useful as a means to reduce turbulent drag in a passive manner, and thus improve the lift to drag ratio with simple geometric variations. All blades are machined using a CNC mill out of Nylon plastic for high accuracy and low frictional drag owing to imperfections in construction or material.
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