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Abstract Complex turning vanes are commonly implemented within advanced turbomachinery systems used to mitigate or generate secondary velocity distortion for ground testing aircraft engines or fan rigs. The vanes generate large-scale vortex structures at the trailing edge region which shed and convect downstream to the neighboring stages and components. This process, known as trailing edge vortex shedding, can induce unwanted vibrations and performance losses if not accurately characterized during design phases. The current work aims to evaluate a hybrid Reynolds-Averaged Navier-Stokes (RANS) and large eddy simulation (LES) turbulence model in the prediction of trailing edge vortex shedding from StreamVane distortion generators at Reynolds numbers on the order of 105. The results are directly compared to unsteady RANS predictions and time-resolved particle image velocimetry measurements acquired in previous studies. The comparisons reveal significant qualitative differences between the large-scale wake structures due to the resolved integral scales of the hybrid model. For certain vane configurations containing highly unstable wake flows in the spanwise direction, the hybrid model improved the shedding frequency predictions by more than 11%. However, the hybrid model only marginally improved the frequency predictions by 0.4% for more stable, albeit more complex, wake flows.
Hayden et al. (Mon,) studied this question.