A key ingredient in turbine and compressor forced response analyses is the prediction of wake strength. An empirical wake model and a 3D CFD flow solver have been used for this purpose. The empirical wake model predictions were compared with wake data obtained from low speed turbine and compressor rigs, and from a high speed turbine facility for a high pressure turbine nozzle with cooling flows. The CFD flow solver is used to predict the turbine low speed and high speed wakes, and to provide a basis of comparison for transonic fan wakes. The wake data and predictions were Fourier decomposed to compare the harmonic content of the wakes. Although the empirical wake model adequately predicts the compressor wakes, turbine wake predictions need improvements. The CFD wake model needs additional data for calibration, in particular with regard to turbulence and transition. This paper provides a guide for applying empirical and CFD methods to model turbine and compressor wakes for blade forced response analysis.

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