Numerical analysis of flow field in centrifugal fan
                                                HE Xiao di, JI Ai min, PENG Li ping, LONG Deng yan, WANG Hao
                                  （College of Mechanical and Engineering, Hohai University, Changzhou 213022, China）

Abstract: Aiming at the problem of large flow loss and low efficiency in the centrifugal fan, the flow field inside the fan was studied by finite element software. Firstly, taking the fan ME103 as an example, the air inlet test was carried out to determine the boundary conditions required by the FLUENT fluid simulation. The three dimensional flow channel model of the fan was established by UG software and meshed by the ICEM software. The 3D numerical simulation results of flow field in ME103 were obtained in FLUENT; Secondly, comparing the exit velocity of ME103 simulation flow field with the experimental data, the two were in good agreement with each other to verify the reliability of the numerical analysis results; Finally, by analyzing the simulation flow field inside the centrifugal fan under working flow and non working flow, the law of flow field inside the fan was obtained and the performance optimization scheme of the fan was proposed. The results indicate that combining the research method of air inlet test and numerical analysis can further explain the characteristics of the flow field inside the fan and provide guidance for the design and manufacture of the same series of highly efficient centrifugal fan.

Key words: centrifugal fan; numerical analysis; flow field; inlet test