Steady-State Stress Prediction of Engine Components Using the State Function Method

In order to obtain the steady-state stress of the critical component for engine preliminary design, this paper performs a comprehensive investigation on the stress estimation using the proposed state function method. The basic principle is the implementation of the engine similarity criteria. To be specific, the steady-state temperature and stress fields of engine components are solely functions of height (H), Mach number (Ma), and rotational speed (N) for the specified engine. Therefore, it is possible to accurately determine the temperature and stress of the components under the desired operating condition. Four coefficients need to be calculated using the sampling points. Results show that the predicted stress of the critical part of HPT and HPC are within 5% errors compared to the finite element analysis results. The proposed method would significantly reduce computational workload and provide good reference for engine preliminary design. This method has significant practical value in engine component life prediction and management.