The method for 3 D design of fans or pumps in the present paper is presented which is based on the solutions of a quasi 3D inverse method and a 3D N S solver.At beginning the flow rate

the pressure ratio and the geometry of meridian pattern were given. The span height distributions of inlet and exit pitch wise averaged flow angles (or blade circulation) of the blade channel were obtained by the preliminary calculations.They are served to be the target parameters of the present calculation.Successively using a quasi 3D inverse method and a N S solver

a 3 D blade configuration can be obtained.As an example

an axial single rotor fan is shown.