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The Investigation of Rotating Instability Under Distortion Based on a Compressor Rotor

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Abstract

The twisted-swept fan is one of the most important components of a high bypass ratio engine. Under clean inlet flow or inlet distortion, the unsteady flow field of the fan rotor near stall condition is obtained by numerical simulation. At the same time, fast Fourier transform (FFT) transformation of the monitors is completed. Fans with different tip clearances are compared and analyzed under intake distortion conditions. Different types of total circumferential pressure distortion are also compared and analyzed. Under inlet distortion, modal analysis of the unsteady flow field was performed using dynamic mode decomposition (DMD) method. The reduced-order decomposition of flow field effectively analyzes structures of flow field under distorted conditions. Finally, Fast Fourier Transform and circumferential mode are applied to inlet distortion flow field of the fan rotor. Rotating instability phenomenon was found in distortion conditions. When inlet flow is clean, there is no rotating instability phenomenon. This shows intake air can cause rotating instability (RI) phenomenon of the flow field under distortion. This provides a new explanation for rotating instability phenomenon different from existing research. The effective application of two analysis methods provides new analysis ideas for the unstable flow field.

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Zhang, K., Park, W.G. The Investigation of Rotating Instability Under Distortion Based on a Compressor Rotor. Int. J. Aeronaut. Space Sci. 23, 471–483 (2022). https://doi.org/10.1007/s42405-022-00467-2

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  • DOI: https://doi.org/10.1007/s42405-022-00467-2

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