发动机篦齿-橡胶涂层碰摩转子振动特性实验研究

Rotor-stator rubbing is common in aero-engines，and the induced rotor vibrational characteristics are affected by the rubbing materials. The soft coating made by vulcanized rubber is considered for rubbing case，followed by the experimental investigations on the kind of progressive rubbing between the seal-labyrinth and the seal-case of aero-engine booster. The rotating speed，vibrational displacement waveforms，shaft orbits and whirl features during the rubbing process are analyzed. In the results，four variation-phases are observed for the investigated rubbing，wherein the rotating speed experiences a period of uncontrolled-deceleration，super-acceleration，oscillating-recovery，and excessive-deceleration. The most significant changes of vibrational displacement waveform are captured in the uncontrolled-deceleration phase. The shaft orbit varies from stable to unstable，and recovers to be stable finally. High-order superharmonics（corresponding to the resonance of the rotor and stator），the modulations of the fundamental frequency and low-order harmonics of forward whirl and backward whirl are excited by the soft rubbing. The vibrations at the turbine end are slightly impacted by the rubbing at the booster end.