Effect of a Radially Offset Impeller on the Unsteady Characteristics of Internal Flow in a Double-Suction Centrifugal Fan

The impeller of double-suction centrifugal fans may be radially offset from the centerline volute due to faults in assembly or installation. radial results more significant non-uniformity internal flow fan, which is biased designed condition, and deteriorates aerodynamic performances fan. In this paper, we performed Unsteady Reynolds-averaged Navier–Stokes (URANS) simulations on unsteady a fan direction its original position thus closer wall one side away opposite side. Numerical show that changes size gap between collector direction, produces non-uniform distribution static pressure even reversed at inlet impeller. As baffle volute, back into observed, strong circulating vortices form around baffle, weakens diffusing capability volute. However, as close generally improves patterns within impeller, while boundary layer separates surface blades near front disc angle varies; maximum velocity could reach 20 m/s lowers efficiency