Análise numérica da influência de pás auxiliares no desempenho aerodinâmico e acústico de ventiladores centrífugos

Abstract

This work presents a Methodology for Numerical Analysis of Centrifugal Fans with splitter blades through Computational Fluid Dynamics Techniques (CFD), to determine the influence of splitter blades on fan behavior and broadband noise sources. It was considered a rotor with ten main blades in a circle arc shape. A three-dimensional numerical simulations of the complete steady flow field in the whole impeller were considered, the inlet velocity and constant speed rotation as boundary conditions were given based on the experimental test. The numerical results of the rotor without splitter blades was conducted by comparison with the experimental data from the UNIFEI fan test rig. The turbulence model employed k-w SST was suitable to identify viscous effects and energy dissipation by turbulent viscosity provides a good qualitative prediction with the experimental results. Regarding the acoustic power levels results, based on the sound pressure, it was satisfactory based on analysis in the literature. Aerodynamic loading analysis were also performed to quantify the effects on efficiency considering the splitter blades.