Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Numerical Investigation of the Aerodynamics and Aeroacoustics Effects of a Zigzag Tripping on an Aeronautical Propeller
Submission Author:
Mateus Grassano Lattari , SC , Brazil
Co-Authors:
Gabriel Caldeira Vicente, Mateus Grassano Lattari, Cesar Deschamps, Julio Cordioli
Presenter: Gabriel Caldeira Vicente
doi://10.26678/ABCM.COBEM2023.COB2023-2357
Abstract
The use of VLES-based Lattice Boltzmann methods in Computational Aeroacoustics (CAA) has gained attention due to their lower computational time compared to classical LES. However, these methods face challenges in accurately predicting the transition from laminar to turbulent flow. To address this, a zigzag-shaped protuberant structure is added to the propeller walls to disturb the boundary layer and transition from modeled turbulence to scaled turbulence calculations. In this study, a numerical investigation using VLES Lattice Boltzmann is conducted on a three-bladed NACA 5868-9 propeller to analyze the aerodynamic and acoustic effects of the zigzag tripping at different chord positions along the propeller radius. The tripping position was predicted using a low-order aerodynamic method based on the panel technique. The CAD model of the propeller was simulated in PowerFLOW, which uses the VLES Lattice Boltzmann method. The predictions without the zigzag tripping were validated and showed agreement with experimental data. With the inclusion of zigzag tripping, thrust and torque differed by approximately 10-20%, indicating its potential to alter the boundary layer and influence propeller loads. The study aims to provide preliminary insights into fluid mechanisms, spectral analysis of propeller noise emissions, and assess the advantages and disadvantages of the zigzag tripping strategy for improving CAA accuracy.
Keywords
Lattice Boltzmann method, Zigzag tripping, NACA 5868-9, Aerodynamics, Aeroacoustics
