Sliding grid simulation of cascade noise
Wei Ying, Ryu Fattah
Last updated on April 6, 2022
The rotational motion of the fan blades was considered, by applying a high-order hybrid sliding interface between the turbulence injection region and the OGVs. The effect of the advance ratio and turbulence properties of the fanwakes, such as the wake width and turbulent integral length scale, on the sound power level, were investigated. The sound power level obtained are compared to analytical predictions.
The wake rotation speed has no significant effect on the noise generated by the cascade, due to the similar levels of averaged turbulence intensity across each case. This will remain true, as long as the separation between adjacent wakes is a constant. The changes in the wake width have a significant influence on the upstream and downstream sound power levels. Wider wakes tend to increase the PWL at low frequencies and decrease the levels at high frequencies. Similar effects were observed for the downstream PWL spectra.
Reference
1. W. Ying, R. Fattah, S. Zhong*, X. Zhang*, and Gea-Aguilera F., “A numerical investigation of the rotor blockage effect on cascade noise using a sliding mesh method”, Journal of Sound and Vibration, 502, pp.116030, 2021 2. W. Ying, R. Fattah, S. Zhong*, J. Guo, X. Zhang, “An efficient and high-order sliding mesh method for computational aeroacoustics”, Journal of Supercomputing, 1-29, 2022