researchers have conducted studies on the reduction of noise in
centrifugal fans and blowers, but most of these have focused on
noise prediction and flow analysis using CFD. Therefore, further
studies must be carried out from the point of view of noise reduction,
including the prediction of actual noise and evaluation of
noise emitted by the noise source [5–9]. Meanwhile, additional
analytical studies of the aerodynamic noise caused by the impeller
also need to be conducted that integrate the two fields of fluid
dynamics and acoustics. Most of the suction housing’s apparent
noise is generated when the aerodynamic noise generated by the
impeller is emitted outside [10,11]. The exhaust pipe is also one
of main noise sources of the suction housing. For the exhaust pipe,
the use of a silencer is quite useful, offering noise reduction that is
quite economical in terms of cost and production availability. The
silencer’s noise reduction performance can be quantified easily by
calculating the transmission loss using the transfer matrix method
[12]. Thus, conducting acoustic analysis of the aerodynamic noise
caused by the impeller and studying the silencer’s exhaust noise
reduction is an effective way to identify opportunities for noise
reduction. In general, it is expensive to manufacture prototypes
for verification after the design of low-noise impellers.
researchers have conducted studies on the reduction of noise incentrifugal fans and blowers, but most of these have focused onnoise prediction and flow analysis using CFD. Therefore, furtherstudies must be carried out from the point of view of noise reduction,including the prediction of actual noise and evaluation ofnoise emitted by the noise source [5–9]. Meanwhile, additionalanalytical studies of the aerodynamic noise caused by the impelleralso need to be conducted that integrate the two fields of fluiddynamics and acoustics. Most of the suction housing’s apparentnoise is generated when the aerodynamic noise generated by theimpeller is emitted outside [10,11]. The exhaust pipe is also oneof main noise sources of the suction housing. For the exhaust pipe,the use of a silencer is quite useful, offering noise reduction that isquite economical in terms of cost and production availability. Thesilencer’s noise reduction performance can be quantified easily bycalculating the transmission loss using the transfer matrix method[12]. Thus, conducting acoustic analysis of the aerodynamic noisecaused by the impeller and studying the silencer’s exhaust noisereduction is an effective way to identify opportunities for noisereduction. In general, it is expensive to manufacture prototypesfor verification after the design of low-noise impellers.
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