Resumo:
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.
