Numerical study on jet-wake flow and its evolution in a centrifugal pump with alternating stall

• DOI: 10.1063/5.0169031
• Publication Date: 2023-11-02T11:54:40Z
• Authors: Benqing Liu; Wei Yang; Li Cheng; Xianbei Huang; Weixuan Jiao
• Keywords: Stall (fluid mechanics)

Stall and jet-wake flow are two typical forms of unstable phenomena in centrifugal pumps, significantly affecting their stability. This paper investigates the interaction mechanisms between stall a impeller under different working conditions. The unsteady numerical study utilizes partially averaged Navier–Stokes (PANS) model with new dynamic fk expression derived from rotation-corrected energy spectrum. results reveal four stages field evolution pump In stage I, no vortices present, occurs. velocity distribution at outlet depends on pressure difference suction sides within passage. As rate decreases, increases, intensifying phenomenon. Under part-load conditions (stages II, III, IV), presence becomes main factor flow. These influence local downstream fields, thus altering jet-wake. When vortex is side, it reduces near weakening intensity On other hand, when enhancing