Based on the computation and analysis of three-dimensional unsteady flow induced by rotor/stator-interaction

the characteristics of flow excitation to bladed disk were studied

including frequency-components and circumferential wave-components in the wake of stator. By combining the resonant condition of bladed disk

a design principle was given for determining the stator-structural period from the view of avoiding resonance

namely

the stator-structural period should ensure that in the wake excitation there was neither modal frequency-component of bladed disk nor circumferential wave-component corresponding to the nodal diameter of the bladed disk. The formula was given to predict frequency-components and circumferential wave-components in wake of stator

making it easier to determinate stator-structural period in design phase. It is shown by numerical analysis that this method can determinate the rationality (inducing the resonance or not) of stator-structural period without need of performing numerical simulation of three-dimensional unsteady flow induced by rotor/stator-interaction.