The Thermal-mechanical Coupling Of Aeroengine Rotor

As the most important composition of national defence, aviation industry makes great devotion to national security. Aeroengine as the "heart" of aircraft, has been the research focus of China aviation industry research topics for many years. Rotor is main components of aeroengine, is the most important parts of the engine, running in the most harsh conditions, to some extent, the life of rotor determines the life of areoengine. As the working characteristics of rotor, temperature seizes an important position in the harsh working conditions, the change of temperature often affect the other parameters of rotor. Many fault of the rotor, such as rubbing, thermal bending, cracking, having temperature factors. The study of thermal mechanical coupling of aeroengine rotor will provide important theoretical foundations and suggestion for better understanding the running of areoengine, more indepth study in fault feature of aeroengine, finding the relationship between temperature and fault, also contributing to preventing the fault and structural optimization of the rotor. This paper mainly studied thermal mechanical coupling of aeroengine rotor, the model is dual rotor aeroengine. The works are as follows:(1)An overview of the structural characteristics of aircraft engines, conbined the structural characteristics of aircraft engines discussed the principle of thermal bending fault of rotor.(2)Deduced and analyzed theory application of the finite element method in thermal mechanical coupling, established one dimensional analytical model and two-dimensional difference model of rotor.(3)Established the model of thermal-mechanical coupling temperature field, also established a three-dimensional model of dual rotor. With ANSYS software, did simulations of rotor through the temperature field and stress field. With the graphics and data, studied the temperature cloud picture and stress cloud picture.(4)Established a mathematical model of rotor rubbing, a model of thermal bending rubbing in temperature field, a model of rubbing force. Explored the feasibility of Newmark integration method in the numerical solution in nonlinear problems(5)Studied the affection of temperature changing to the natural characteristics of rotor by ANSYS simulation. Carried out the modal analysis and dynamics simulation of the dual rotor.(6)Based on the radial deformation of stator is the elastic deformation and the friction between rotor and stator is satisfied Coulomb friction assumption, studied the dynamic behavior caused by the change of rubbing clearance, rubbing stiffness, and rubbing temperature by ANSYS simulation.(7)Explored the generation mechanism of rotor-to-stator rub, thermal bending fault, friction heating bending fault, the relationships between these faults and temperature, and the mutual influence among the faults.