Studying the Effect of Geometric Parameters of Axial Fan Twisted Blades Inside Different Cross-Sectional Ducts
Keywords:winglet fan, round and square ducts, CFD simulation
Numerical simulation validated with experimental tests is carried out to study the effects of changing some geometrical parameters concerning the twisted blades of a DC power driven computer-case axial fan having a curved-shape winglet tip including the winglet tip mean bending angle, the winglet tip height and the blade profile leading-edge twisting angle. The winglet tip incidence angle is changed from (90-70) degrees, the blade tip base height is increased by (10) %, and the variation of the blade twisting angle is changed from (35-24) degrees considering the air flow past the rotating fan is isothermal and subsonic, the simulation is performed using the shear stress incorporated K-? turbulence model in the ANSYS-CFX package neglecting the thermal effect considering the flow is passing through rectangular and circular cross-sectional ducts. The results indicated that the fan is more effective using the circular duct regarding that the three investigated parameters have a differential influence on the free stream flow.