ANALYSIS OF INFLUENCING FACTORS IN A ROTATING BLADE EXCITATION TEST DEVICE

Carrying out blade excitation vibration tests in the rotating state is an important method for studying the dynamic characteristics of rotor blades. The characteristics of the blades are obtained by simulating the excitation under actual operating conditions, thereby allowing the study of fatigue life and damping structure design. Therefore, it is necessary for the excitation energy applied to the blade in the test to be sufficient. In this paper, an analysis of the test device, which generates excitation through aerodynamic turbulence is carried out, in order to provide references for increasing the excitation energy of the device. The dynamic characteristics of the aerodynamic excitation acting on the blades in the rotating test are studied by numerical simulation. Then, the influence of the test device design parameters on the distribution and intensity of aerodynamic excitation is analysed. The results show that increasing the rotational speed, increasing the molar mass of the fluid medium, shortening the axial distance, and improving the shape of the turbulator all contribute to raising the intensity of aerodynamic excitation.