悬臂型箔片轴承应用于高速透平的实验研究

In order to evaluate the operation performance of the multi-leaf foil bearings and their application potential in high-speed turbo-machinery, an experimental research of multi-leaf foil bearings was conducted. At first, static and transient tests of the multi-leaf journal bearings with different foil thickness were performed on the journal bearing test rig, and the load-deflection, start-up and operating friction torque characteristics, as well as the bearing Coulomb friction and friction torque, under different foil thickness and bearing loads were obtained. Afterwards, both multi-leaf foil journal and thrust bearing were applied in the high-speed turbo-machinery with a rotor diameter of 25 mm. The transient speed-up, high speed, and speed-down experiments of the rotor-bearing system were conducted on the high-speed turbo-machinery test rig. The transient characteristics and stability of the rotor with the support of the aerodynamic multi-leaf foil bearings were analyzed. The experimental results indicate that: the start-up torque (0.6×10^-2- 1.8×10^-2 N•m) and steady operation frictional torque (0.25×10^-2- 0.5×10^-2 N•m) of the multi-leaf foil journal bearing is relative small; the maximum rotor speed of the turbo-machinery reaches 93.9×10³ r/min under the support of the aerodynamic multi-leaf foil bearings; small main frequency vibration amplitudes (<6 μm) and low-frequency swirling vibration amplitudes (<0.5 μm), as well as clear rotor orbit, were observed in all the transient speed-up, high speed and speed-down processes, showing a good stability. The experimental research provides the feasibility for the application of multi-leaf foil bearings in high-speed turbo-machinery.