In order to ensure flight safety, the stall test is one of the most important steps in the airworthiness certification phase of civil aircraft. The twisted-swept fan is one of the most important components of the high bypass ratio engine. The unsteady flow field of the fan rotor stall condition is obtained by numerical simulation. At the same time, the time series flow field data of the stall condition flow field is acquired. The modal analysis of the unsteady flow field at stall condition was performed using the dynamic mode decomposition and proper orthogonal decomposition methods. Through modal identification of a large number of unsteady flow field data, the eigenvalues and corresponding modal information about the unsteady flow field change process are obtained. Finally, the evolution process of the unsteady flow field of the fan rotor under stall condition is visually demonstrated, and the coherent structures of different scales in the complex flow field under stall condition are revealed.

中文翻译：

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基于适航审定的高涵道风机转子动态失速流场分析

为确保飞行安全，失速测试是民用飞机适航审定阶段最重要的步骤之一。双绞风扇是高涵道比发动机最重要的部件之一。通过数值模拟得到风机转子失速状态下的非定常流场。同时获取失速状态流场的时间序列流场数据。使用动态模态分解和适当的正交分解方法对失速条件下的非定常流场进行模态分析。通过对大量非定常流场数据进行模态识别，得到非定常流场变化过程的特征值和相应的模态信息。最后，