Optimization Design of Centrifugal Fan Impeller Based on Numerical Simulation

The multi-blade centrifugal fan is small in size, compact in structure, which has high pressure coefficient and flow coefficient, but usually has low efficiency. In order to improve the aerodynamic performance of multi-blade centrifugal fan. CFD (Computational Fluid Dynamics) method was used to simulate the flow field of the fan, and the key factors affecting the performance of the fan were analyzed. According to the controllable deceleration method, a new blade profile is designed, two airfoils are used to optimize the blade shape, and the results are compared and analyzed. The results show that the newly designed profile can improve the performance of the fan, and the appropriate airfoil blade can reduce the flow loss caused by the change of Angle of attack, improve the efficiency of the fan, and make the efficiency zone wider.