Research on Influence of Non-harmonic Splitter Blade on Aerodynamic Noise Characteristics of Centrifugal Compressor Impeller
In order to investigate the feasibility and noise reduction degree of non-harmonic design on cen-trifugal impeller,aerodynamic noise characteristics of four kinds of diffused vane non-harmonic impels and original uniform impels were compared and analyzed by using unsteady numerical simulation and FW-H aerodynamic noise model.The influence mechanism of non-harmonic design on aerodynamic noise was re-vealed through the spectrum characteristics of pressure pulsation and turbulent kinetic energy distribution of blade surface.Results show that the circumferential angular non-harmonic design of splitter blade can reduce the discrete monophonic noise while ensuring the aerodynamic performance.In the comparison schemes adopted,the noise reduction effect of impeller Al is the most obvious.At the 1st,2nd and 3rd order,the sound spectral density of the blade passing frequency decreases by 43 percentage points,44 per-centage points and 50 percentage points respectively,and the corresponding pressure pulsation amplitude decreases by 25 percentage points,25 percentage points and 30 percentage points respectively.At the same time,the broadband noise level increases significantly compared with the original uniform impeller.
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