Method for measuring hole flow or clearance flow of rotating component of turbine motor

The invention provides a method for testing hole flow or clearance flow of a rotating component, and particularly discloses a method for measuring hole flow or clearance flow of a rotating component of a turbine motor. The method comprises the specific steps that (1) a to-be-measured hole or clearance in the rotating component is sealed, turbine motor flow field parameter testing is carried out, the flow flowing through the labyrinth clearance between a rotor and a stator of the rotating component on different working conditions is measured, and a flow curve is obtained; (2) sealing of the measured hole or clearance in the rotating component is removed, turbine motor flow field parameter testing is carried out again, the total flow flowing through the rotating component on the same working condition as the step (1) is measured, and a flow curve is obtained; (3) according to the flow curves obtained through two tests, interpolation conversion and fitting are carried out corresponding to the same working conditions to obtain a flow difference curve which is the curve of the flow flowing through the measured hole or clearance in the rotating component on the corresponding working conditions. According to the flow curves obtained through the method, part parameters such as the impeller balance hole size and the fir tree blade root clearance size are effectively selected, and effective design, material selection and manufacturing for the turbine motor are facilitated.