Investigation of modal evolution and flow instability characteristics during radial diffuser stall in high-load centrifugal compressor with a throttle model

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This investigation reveals flow instability dynamics in radial diffusers, indicating influences of stall frequency on performance.

Flow instability in radial diffusers significantly restricts the stable operating range for compressors, impacting efficiency.
The stall frequency rises from 396.3 Hz to 684.2 Hz as the flow transitions from stall development to stable stall.
Analysis using dynamic mode decomposition identifies critical mechanisms driving instability during the stall process.
The energy of low-frequency modes becomes predominant during stable stall, contributing majorly to instability in the diffuser.

Yang et al. (2025) studied this question.

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