CFD Analysis on the Effect of Radial Gap on Impeller-Diffuser Flow Interaction as well as on the Flow Characteristics of a Centrifugal Fan

Table 2

Computed flow parameters at design point operation of the fan.

Configuration type	Radial gap ratio 𝑅gr	Flow coefficient (Φ)	Max. efficiency 𝜂(%)	Head coefficient (Ψ)
A	0.05	0.085	22.84	0.235
B	0.10	0.073	24.59	0.304
C	0.15	0.066	27.37	0.360
D	0.20	0.074	22.63	0.333
E	0.25	0.078	22.02	0.3324
F	0.30	0.076	20.99	0.372