Stall Mechanism in an Ultra-High-Pressure-Ratio Centrifugal Compressor [超高压比离心压气机失速机理探究]

作者：Zhang Y.-J.; Han G.; Li Q.-K.; Zhang Z.-Q.; Zhang Y.-F.; Lu X.-G.

来源：Journal of Engineering Thermophysics, 2022, 43(2): 309-315.

• Backward-traveling rotating stall
• Stall inception
• Ultra-high-pressure-ratio centrifugal compressor

Rotating stall and surge, representing the breakdown of the orderly flow through a compressor, limits the performance of all types of compressors. This paper presents the dynamic process of the stall inception and its development in an ultra-high-pressure-ratio centrifugal compressor based on the full-annulus unsteady simulation. The results indicate that under the condition of supersonic inlet flow, an intensive shock is formed at the radial diffuser throat. In the process of throttling the compressor, the shock-induced boundary-layer separation appears due to the increase of incidence, and thus triggers the stall. In addition, when the stall is mature, the 6 stall cells in the diffuser propagate in the opposite direction of the impeller rotation, which is different from the classic stall model in which the stall cells propagate along the direction of the impeller rotation.

• 单位
  中国科学院大学