Abstract: A reversible axial flow fan is required to run with high aerodynamic performance both in forward direction and in backward direction. S-type blades are usually used in such fans because of the absolute geometrical symmetry. A new S-type blade with high aerodynamic performance is constructed based on the NACA digital airfoil series. By simulating the flow field in the fans based on Reynolds-Averaged Navier-Stokes equations, the method of orthogonal design is implemented to design the flow path of a reversible axial flow fan with S-type blade. Choosing the parameters of blade shape, torsional angle and clamping angle as design variable parameters, an optimum flow path of a reversible axial flow fan with S-type blade is obtained.

Key words: Design, Fan, Navier-Stokes equations