Optimization Research of Centrifugal Fan with Different Blade Number and Outlet Blade Angle

The characteristics of the three-dimension flow field of the G4-73 centrifugal fan were numerically simulated based on the k - epsilon turbulence model with the Fluent, and then verified the simulating result by experiment. Taking the efficiency eta maximizing as a function goal, while the blade number and the angle of blade outlet as the variable quantities, the fan impeller parameters are optimized based on least squares method. The optimizing results showed that the performance of centrifugal fan was improved by lowering the energy loss which caused by the secondary flow vortex, the volute tongue, the wake-jet and the angle of attack. After the optimization, the total pressure and efficiency increased 3.7% and 0.5% respectively.