(State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi‘an Jiaotong University, Xi’an 710049, China)
To analyze the blade/case rub-friction process of aero-engine, a blade/case rub-friction model is established based on the finite element method, and the ultratransient friction heat effect at the interface under a single rub is studied. The influence of grid size and time step on simulation results during rub-impact simulation is explored and analyzed. It is found that the ultra-transient heat transfer occurs only in a small range of blade tip due to the high friction speed and short rubbing time between blade and casing. At the same time, the friction heat generated by rubbing is transferred by the order of molecular size in space dimension. During model building, grid size and time step have a significant influence on simulation results. Therefore, by optimizing the grid size and time step in the modeling process, a correct modeling method that can accurately reflect the ultra-transient characteristics of the temperature micro-zone is obtained. The influence of grid size matching with time step on micro-zone super-transient behavior is clarified, which establishes the foundation for the model of blade-case rub-impact friction.