Session: 34-13 High-fidelity CFD for Compressors II

Submission Number: 178476

Flow Analysis of Compressor Annular Cascade Based on Adapted Scale-Driven DDES Method 

Flow instability in compressors is a critical factor affecting the reliability and efficiency of aero-engines. In this study, an adapted scale driven DDES method (ASD-DDES) suitable for three-dimensional turbomachinery flows is proposed and applied. Using a stationary annular compressor cascade operating near the stall point as the research object, numerical simulations are conducted with a particular focus on the flow structures in the mid-span region. The flow-field resolution capabilities of the Unsteady Reynolds-Averaged Navier–Stokes (URANS) method and the ASD-DDES approach are comparatively evaluated.The results demonstrate that, under identical operating and mesh conditions, ASD-DDES significantly enhances the resolution of vorticity and unsteady turbulent structures compared with URANS. In particular, the method captures small-scale coherent vortices and intermittent disturbance propagation with a much higher level of fidelity, enabling a more physically realistic representation of near-stall flow behavior. Additionally, ASD-DDES provides a clearer distinction of flow-field characteristics among different passages, revealing the intrinsic passage-to-passage variability that becomes increasingly prominent as the operating condition approaches stall. This inter-passage differentiation offers valuable insight into how local geometric or flow non-uniformities may trigger or amplify instability.These findings collectively confirm the efficiency and accuracy of the ASD-DDES method and indicate its suitability for in-depth investigations into the mechanisms by which disturbances contribute to compressor flow instability. The improved ability to resolve unsteady features also highlights the method’s potential for guiding the development of more robust instability prediction and control strategies in future compressor designs.

Presenting Author: Jinze Liang Beihang University

Presenting Author Biography: A Ph.D. candidate at Beihang University, specializing in research on the dynamic stability of internal flow within compressors.

Authors:

Jinze Liang Beihang University
Teng Li Beihang University
Tianyu Pan Beihang University
Qiushi Li Beihang University