Shrouded stator cavity flow is a major source of aerodynamic loss that limits the compressor pressure rise capability. This paper analyzes the loss mechanisms of cavity leakage flow by examining the mean flow phenomenon and the entropy generation under a broad range of compressor operating conditions. In the first place, the effectiveness of the numerical method is validated using the experimental data of the detailed flowfield. Then, the disfavored mean flow phenomenon, the entropy-based loss of efficiency, and the irreversible entropy generation rate with and without the cavity are analyzed. Results show that the cavity generally reduces the compressor isentropic efficiency by about 0.5–0.9% in the investigated case. The extra entropy loss generation mainly comes from the stator passage rather than the cavity passage. The nature of the extra irreversible entropy generation is mostly turbulent viscous dissipation rather than the mean flow terms and the irreversible heat flux terms. The mean flow phenomena associated with the extra loss are mainly the partitioning of the stator inlet profile, the circumferential and radial migration of leakage flow, and the changes in the separated flow topology. These understandings provide useful guidance for the aerodynamic design of the shrouded stator.
Loss Mechanisms of Shrouded Stator Cavity Flow in an Axial Compressor
01.03.2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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