Abstract
To study the effect of inner guide vanes on the grease particle separation performance of multi-blade centrifugal fan (MCF), numerical simulations are executed under the working condition. The inner guide vanes are arranged in a ring with even space at the blade outlet. The turbulent airflow field is modelled with the renormalization group (RNG) k-ε turbulence model. For the particulate phase, discrete phase model (DPM) is employed to track greases particles migration. The comparison of grease particles separation efficiency suggests that the potentially benefit effects induced by inner guide vanes is efficient and reliable. The predicated results show that the total separation efficiency of MCF with inner guide vanes is higher by 4.5% than that of the original MCF for the particle of diameter between 1 μm to 10 μm. In addition, the separation efficiency of volute is higher than that of the original MCF and it mainly separates grease particles for the diameter in the range of 1 μm to 4 μm.
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