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Numerical Design and Parametric Optimization of Centrifugal Fans with Airfoil Blade Impellers

Author Affiliations

  • 1 School of Mechanical and Building Sciences, VIT University, Vellore-632014, Tamilnadu, INDIA

Res. J. Recent Sci., Volume 1, Issue (10), Pages 7-11, October,2 (2012)

Abstract

There are six types of centrifugal fan impellers AF, BI, BC, FC, RT, RB among which the AF i.e. impellers with airfoil blades are considered as highly efficient. The following paper presents the design methodology for the centrifugal fan system with impellers having airfoil blades. The numerical design procedure is developed for it and the CFD optimization has been carried out for volute casing to improve the results which have got from the numerical procedure only. A case is studied from technical bulletin1 for this purpose and the results are correlated with those obtained from the numerical procedure developed. The concept of MRF (moving reference frame) is applied in the CFD analysis of the centrifugal fan as a rotating region around the impeller, keeping the components of the impeller stationary. The volute casing was optimized by decreasing the volute clearances by 10-14% and increasing the cut off height by 5% keeping it at 35% of impeller diameter. Thus the design methodology which includes the assistance of CFD optimization has been developed successfully.

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