关键词: 轴流压气机；非定常；确定应力；相位延迟；叶片约化；非线性谐波法

Abstract: In order to analyze the precision of different unsteady simulation methods in prediction of deterministic stress field and provide guidance for the determining stress modeling and calibration，the deterministic stress obtained using the nonlinear harmonic，phase lag and domain scaling method respectively are compared to results predicted by a conventional half annulus unsteady simulation. Numerical results indicate that the nonlinear harmonic method usually obtains higher deterministic stress，phase lag and domain scaling method can all achieve high accuracy level in prediction of deterministic stress field，however，both three solutions fail to accurately capture the circumferential distribution of that. By including more number of harmonics，the calculation precision of frequency-spectrum characteristics gained with nonlinear harmonic method can be improved，and a growing trend in deterministic stress can be observed also，whereas it has a negligible effect on the prediction accuracy of time-averaged parameters of flow field.

Key words: Axial flow compressor；Unsteady；Deterministic stress；Phase lag；Domain scaling；Nonlinear harmonic method