Clearance Analysis of Rotor–Stator Coupled Structures Under Maneuver Flight Conditions Considering Multi-Physical Fields

In the previous studies on the clearance between rotors and stators, only a single physical field or part of the physical fields are considered. In fact, multi-physical fields (inertial moment, temperature, centrifugal, and aerodynamic load) significantly affect the clearance analysis results, especially the inertial load caused by maneuver flight. However, few studies have been found in clearance studies that can comprehensively consider the influence of various loads. To reflect the actual service environment and accurately calculate the clearance, a clearance analysis method is proposed which can consider the inertia moment, temperature, centrifugal, and aerodynamic load simultaneously. Firstly, the dynamic model of the rotor–stator coupled structure is created by using the finite element method. The coupling between blade tenons and disk grooves is realized based on the friction contact way. The bolt connection at the stator flange is simulated by the beam element, and the bearing supports at the rotor are simulated by the spring element. Furthermore, the clearance experiment platform of the rotor–stator coupled structure is constructed, and the validity of the proposed method is verified based on the clearance test results. Finally, the influence of multi-physical fields on the clearance of the rotor–stator coupled structure is investigated, and some new clearance variation rules are found.