LAUSR

Purpose The purpose of this paper is to obtain a better understanding of the rotor-stator interaction in the vaneless region of a centrifugal pump. Design/methodology/approach A third-order SGS model containing the rotation rate tensor named DCNM is used for simulating the flow field in a centrifugal pump with vaned diffuser. The pressure coefficient and velocities distributions are compared with the experimental data. Focusing on the vaneless region, the pressure pulsation, Reynolds stress pulsation and the Reynolds stress transport equation are analyzed. Findings The comparison of the calculating results with the experimental data indicates that DCNM can accurately capture the distributions of pressure and velocity in the vaneless region. Based on the instantaneous pressure signals, the pressure pulsation is analyzed to show that in the vaneless region the dominant frequency near the impeller is twice the blade-passing frequency while it is equal to the blade-passing frequency near the diffuser. Further...