关键词: 叶尖间隙;流-固-热耦合;数值分析;

Abstract: Blade tip clearance of gas-turbine engine has an effect on its performance and reliability. So a lot of numerical analyses and tests on the tip clearance control system are developed in many research institutes. Mixed-compressor tip clearance was simulated, considering the thermal load,mechanical load and aerodynamic load, while thermal-fluid-structure coupled method was adopted, and tip clearance at different steady working state was gained. The results show that displacement tendency of rotor and casing along axial-direction is identical.The maximum displacement is located at the maximum curvature point of casing. At the maximum mechanical load, tip clearance is lower than the one at the design point, but the situation is opposite at the maximum thermal load.

Key words: Tip clearance；Thermal -fluid-structure coupled method；Numerical analysis