关键词: 涡轮转子, 排气机匣, 轴向包容, 冲击载荷, 等效试验

Abstract: Aeroengine casings were typical thin-walled frame structure, aiming at complicated impact loads due to axial and circum-torsional impacts by turbine rotors caused by shaft breaks, the numerical simulation models were established involving key components of turbine rotors and exhaust casings. On the basis of the complicated impact loads and energy dissipations of the exhaust casings in the simulation results, the dynamic responses of complicated impact loads and energy dissipations in the processes of complicated impacts were obtained. It is pointed out that the initial rotation velocity has little influences on impact loads and energy dissipations under the conditions of certain axial forces in the term of the complex movements of turbine rotors. Furthermore, the relative motion relation between the turbine rotor and the exhaust casing was converted. The analysis results show that the impact load and energy dissipation results after conversion remain highly similar to those before conversion. In the subsequent equivalent test methods, these conclusions might be used as a reference for simplifying the structural design of test bed.

Key words: turbine rotor, exhaust casing, axial containment, impact load, equivalent test