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COBEM 2023
27th International Congress of Mechanical Engineering
NUMERICAL ANALYSIS FOR THE DEVELOPMENT OF HIGH-LIFT LOW REYNOLDS NUMBER AIRFOILS USING INVERSE DESIGN GEOMETRIC MODIFICATIONS
Submission Author:
João Victor Lopes Marchiori , PR , Brazil
Co-Authors:
João Victor Lopes Marchiori, Ayrton Cavallini Zotelle, Renato Siqueira
Presenter: João Victor Lopes Marchiori
doi://10.26678/ABCM.COBEM2023.COB2023-0966
Abstract
In the last decades, the development of Unmanned Aerial Vehicles (UAV) was accentuated all over the world, due to the lower cost, reduced size, as well as the absence of a crew. The operating conditions of UAVs typically involve low Reynolds, limiting aspects such as load capacity and also providing complexities such as extensive transition zones. A way to increase load capacity and decrease the runway length for landing and takeoff is by a higher lift coefficient. The present study proposes the development of high-lift low Reynolds airfoils, using as a basis the inverse design by potential flow theory and the widely used airfoil S1223, aiming to increase lift without compromising stall. The inverse design was carried out maximizing the pressure distribution around the airfoil and controlling the transition, obtaining the geometry as an output. The aerodynamic verification was carried out by CFD technique using two-dimensional simulations with the Spalart-Allmaras turbulence model. Furthermore, three-dimensional simulations were carried out with a hybrid URANS/LES turbulence model combined with Transition SST. Two high-lift low Reynolds airfoils were developed, with lift gains up to 15% despite an increase drag is associated. It was observed that the transition significantly influences in the prediction of aerodynamic coefficients, in particular the drag coefficient, besides to the three-dimensional methodology and URANS/LES model having shown greater capacity for predicting the region stall and maximum lift coefficient. It was shown that the design philosophy was successful and that the inverse design combined with the CFD technique for prediction of aerodynamic coefficients can be a powerful tool for airfoil development.
Keywords
UAV, airfoil design, high lift airfoil, Low Reynolds Airfoils, inverse design
