Effect of three dimensional blade technology on aerodynamic performance in centrifugal fan

Three dimensional blade technology of bowed-swept blade was applied to centrifugal fan. According to the changes of stacking line in the circumferential and meridian surface, eight blades were taken into numerical simulation, including positive-bowed blade, negative-bowed blade, forward-swept blade, afterward-swept blade, forward-skewed blade, afterward-skewed blade, forward-swept positive-bowed blade and afterward-skewed positive-bowed blade. By comparing the three different dimensional design blades on aerodynamic parameters, distribution of total pressure loss and relative velocity contour map of different height in the impeller, the effects of different kinds of blade on aerodynamic performance was studied. It can be seen from numerical simulation results that positive-bowed blade, forward-swept blade, after-skewed blade, forward-swept positive-bowed blade and afterward-skewed positive-bowed blade have a positive effect on aerodynamic performance of fan which decreasing the total pressure loss of the corner and controlling separation flow. However, negative-bowed blade, afterward-swept blade and forward-skewed blade have a negative effect on aerodynamic performance which increasing the total pressure loss along the spanwise and making the flow field of full annular somewhat deteriorated.