A Numerical Approach to the Design of a New Split-Type Diffuser in a Centrifugal Fan for Improved Performance

This article highlights the influence of a split-type diffuser on the overall performance augmentation of a centrifugal fan equipped with a forward-curved impeller. Computational Fluid Dynamics (CFD) analysis calculates performance metrics like static pressure rise and total pressure coefficients for design and off-design flow circumstances. The split ratio for the diffuser is varied parametrically by providing a splitter type of wall at salient locations of the diffuser passage. The effect of the split ratio on the three-dimensional flow domain is quantitatively studied. The Re-Normalization Group (RNG) k-ε turbulence model is offered in ANSYS, and the fluent is used in the simulation. The transient analysis is performed using the standard moving mesh technique. According to the CFD study, the arrangement with a split ratio 0.5 is the best option for fan performance augmentation. Compared to the conventional fan model, this optimal configuration improves the static pressure increase coefficient by roughly 17.5% on average. Compared to the non-split type base model, this optimized split diffuser arrangement provides a more significant total pressure coefficient of approximately 3.03%, enhancing static pressure recovery. As a result, this CFD study demonstrates the usefulness of appropriately implementing a split-type diffuser of a forward-bladed centrifugal fan for its overall performance enhancement.