Optimization Design of Centrifugal Fan Inlet Collector by Response Surface Methodology

Optimization design method for the inlet collector of a centrifugal fan with highefficiency and low-noise is investigated.The aerodynamic performances of the centrifugal fan are obtained by numerical simulation in the original parametric design,including the divergence angle and shrinking angle of the fan inlet collector,and the length of the divergent section.The numerical calculation is compared with the experimental result to validate the accuracy of the algorithm.To improve the aerodynamic and acoustic performances of the centrifugal fan,quadratic polynomial regression is considered to analyze the function relation of the centrifugal fan performance and the fan inlet collector parameters,and the optimal structure parameters of centrifugal fan inlet collector are obtained.The results indicate that the three fan inlet collector parameters exert remarkable effects on the aerodynamic performances,but slight effect on sound power level.The divergence angle and shrinking angle of the fan inlet collector obviously affect the aerodynamic performances,while divergent section length does not.After optimizing the centrifugal fan inlet collector,the efficiency and static pressure ratio increase by 3.6% and4.1%,respectively,and the sound power level decreases by 1.7dB.