Method for determining feasible region of aero-engine fan with blade tip

The invention provides a method for determining a feasible region of an aero-engine fan with a blade tip, which comprises the following steps of: 1, selecting a rotating speed and a pressure ratio, and carrying out S2 flow field calculation of different guide blade pre-rotation angles and rotor hub taper angles to obtain a contour map of a rotor blade root Mach number and a stator blade root airflow turning angle; step 2, on the basis of the Mach number of the rotor blade root and the limit value of the airflow turning angle of the stator blade root, marking a feasible region boundary in the contour map of the Mach number of the rotor blade root and the airflow turning angle of the stator blade root; 3, converging feasible region boundaries in the Mach number of the rotor blade root and the airflow turning angle contour map of the stator blade root into the same map to obtain feasible regions of the guide vane pre-rotation angle and the rotor hub taper angle under the selected rotating speed and pressure rati