Frontiers in Energy
>> 2008,
Volume 2,
Issue 2
doi:
10.1007/s11708-008-0040-3
Investigation of flow dynamics and decrease of
vortex noise inside volute of centrifugal fans
Department of Power Engineering, North China Electric Power University;
Available online: 2008-06-05
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Abstract
The characteristics of three-dimension flow dynamics inside the volute of a G4-73No.8D centrifugal fan was simulated numerically using a computational fluid dynamics(CFD) technique. The generation, evolution, and noise of the vortex were investigated when cylinder-shaped and cone-cylinder-shaped anti-vortex rings were added separately. Numerical results showed that large-scale vortices were broken effectively and the flow fields inside the fan were more uniform with the two anti-vortex rings installed. Experimental results indicated A-sound level and spectrum noise of the refitted fan decreased and the two anti-vortex rings were effective in decreasing vortex noise. The cone-cylinder-shaped anti-vortex ring was more effective than the cylinder-shaped one in breaking large-scale vortexes and decreasing vortex noise.
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