Influence of groove on aerodynamic performances and noise of multi-blade centrifugal fan
In order to reduce the noise of a multi-blade centrifugal fan and improve its aerodynamic performances,the effects of groove distribution on the aerodynamic performance and noise of a multi-blade centrifugal fan were studied by numerical simulation.The results show that the grooves weaken the interference between the impeller outlet jet wake and the tongue wall,the high vortic-ity in the channel between the impeller and the tongue decreases,while the flow stability increases.The thickness of the volute wall boundary layer decreases,and reflux and vortex conditions were improved.The flow resistance caused by reverse pressure difference and the flow loss decrease,and the outlet flow kinetic energy and the air volume increase.The air volume of L50G11 model multi-blade centrifugal fan increases by 3.17%,the total pressure efficiency decreases by 4.81%,and the aerodynamic performance changes little.The average noise of the monitoring points is reduced,the maximum average noise reduction is 4.7 dB,and the noise reduction effect is the most prominent.The average noise value of the monitoring point of L75G22 model multi-blade centrifugal fan decreases to 3.51 dB,and the noise condition is improved.The increase of air volume is 4.30%,and the increase of total pressure efficiency is 3.34%,indicating a superior aerodynamic performance.
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