Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
FLOW VISUALIZATION AND DETERMINATION OF AERODYNAMICS COEFFICIENTS IN AIRFOILS WITH PROTUBERANCES ON THE LEADING EDGE BY CFD-OPENFOAM
Submission Author:
DANIEL BARCONI , SP , Brazil
Co-Authors:
DANIEL BARCONI, ALUISIO PANTALEAO
Presenter: DANIEL BARCONI
doi://10.26678/ABCM.COBEM2021.COB2021-1467
Abstract
One of the main applications of computational fluid dynamics, which have been used in several engineering fields since the end of the 20th century, is the understanding of phenomena linked to vehicular hydrodynamics and aerodynamics, especially those related to increased performance of hydrofoils, airfoils and wings through passives devices inserted on the surface of these bodies. Thus, in the present work, a methodology was developed using CFD (Computational Fluid Dynamics) techniques to investigate and understand the hydrodynamics of Humpback whale fin-inspired airfoils, in which protuberances located on the leading edge possibly promote performance improvement. For this study, four different types of leading edge protuberances were projected on a NACA 634-021 baseline profile through a 3D-CAD open-source software. Using the OpenF OAM® platform, transient numerical simulations were performed to record the flow topology for different Reynolds numbers, angles of attack, and types of protuberance. Qualitative results obtained for stream lines, detachment point and vortex generation were compared with flow visualization photographs taken in previous experimental work found in the literature, in order to evaluate the numerical simulation. Numerical results obtained using the k-ω SST turbulent model, within a pertinent Reynolds number range, were expected to be close to the flow topology reported by experimental literature. In fact, there was good agreement between numerical and experimental qualitative results. Using aerodynamics concepts, these results allowed to infer and indicate improved performance by the modified airfoils, to the extent that there were certain disagreements between the flow detachment points of baseline profiles and those with leading edge protuberances. Such disagreements actually corresponded to flow detachment point delays, which may indicate lift gains. In this sense, for an an angle and attack of 2º and at 1900 Reynolds number, it were obtained numerical results suggesting lift gains by the 4S, 8S and 8M airfoils. Further studies are being developed to evaluate the implementation of modified airfoils in engineering applications, such as hydraulic turbines.
Keywords
CFD, OpenFOAM, Humpback whale fins, Lift gains, Performance improvement of airfoils
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