Engine power turbine slender cantilever rotor dynamics design method

Abstract

The invention discloses a dynamic design method for a slender cantilever rotor of an engine power turbine, and relates to the technical field of aero-engine rotor dynamics. The structure and dynamic characteristics of the power turbine slender cantilever rotor are combined from the design angle, adverse effects caused by mass increase are reduced to the maximum extent, meanwhile, the rigidity of a shaft is increased, and key sensitive structure parameters are optimized. And the power turbine shaft structure meeting the critical rotating speed can be rapidly iterated. The design method is simple, very suitable for engineering design application, wide in application range and capable of being used for dynamic design of the cantilever rotor-supporting system of an aero-engine and a gas turbine.

Description

technical field [0001] The invention belongs to the technical field of aero-engine and gas turbine rotor dynamics, and relates to a cantilever rotor dynamics design method, in particular to an engine power turbine slender cantilever rotor dynamics design method. Background technique [0002] The power turbine is located downstream of the turboshaft engine core and is mainly composed of a power turbine, a turbine shaft and a power output shaft. Due to the difference in the structure of the power turbine rotor, the mass of the rotor is mainly concentrated at the power turbine end. The rotor-support system is a typical slender cantilever rotor, and its dynamic characteristics have very significant characteristics. [0003] For a slender and flexible rotor system such as a power turbine shaft, in the design process, if the traditional rotor is adopted to enhance the rigidity of the shaft to optimize the dynamic characteristics, the rigidity of the power turbine rotor will be inc...

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Problems solved by technology

[0003]For a slender and flexible rotor system such as the power turbine shaft, if the rigidity of the shaft is enhanced to optimize the dynamic characteristics according to the traditional rotor in the design process, the power turbine rotor Rigidity will increase the mass of the cantilever end at the same time, resulting in a very weak effect on adjusting the critical speed. At the same time, it will also make the rotor rigid body mode shape bending strain energy too large, showing a large bending mode shape, which is not good for vibration

In addition, when the overall scheme of the turboshaft engine has been determined, structural parameter optimization can only be carried out within a limited range, making it more difficult to optimize the critical speed of the power turbine

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