A Review of Pressure Fluctuations in Centrifugal Pumps without or with Clearance Flow

Abstract

As crucial equipment in the industrial field, the stable operation of centrifugal pumps has drawn noteworthy attention. Relevant studies in the open literature have shown that intense pressure fluctuations have a major effect on the reliability and lifetime of centrifugal pumps. In the present paper, the pressure fluctuations in the centrifugal pumps are discussed in detail from different perspectives. The details of the studies are as follows. Firstly, the pressure fluctuation characteristics in centrifugal pumps are studied without considering clearance flow. Secondly, the pressure fluctuation property is investigated in detail for the pumps, with consideration for clearance flow. The pressure fluctuation characteristics in the wear ring, the pump-chamber clearance region, and the main stream region are studied, and the effect of clearance flow on the external performance of the pumps is analyzed. Thirdly, measures to reduce the pressure fluctuations and forces are summarized to improve the operational reliability of centrifugal pumps. Finally, conclusions and future research perspectives in the field of centrifugal pumps are presented. This review presents the research highlights and progress in the field of pressure fluctuations, which is beneficial to the stable operation of centrifugal pumps in engineering.

Analysis of Pressure Pulsation and Structural Characteristics of Vertical Shaft Cross-Flow Pumps

“…Liu et al [8] conducted experiments and numerical simulations to characterize the energy and pressure pulsation of centrifugal pumps and explained the influence of axial distance on the pressure pulsation of the pump device. At the same time, in order to reduce the impact of pressure fluctuations on centrifugal pumps, Zheng et al [9] summarized measures to reduce pressure fluctuations and stress. Feng et al [10] found through research that the rotor-stator interaction in axial flow pumps can generate pressure pulsation and further vibration.…”

Research on the influence of fluid viscosity on the inlet flow parameters of wiped film molecular distillation

“…It is important to study the total pressure and pressure pulsation behind the impeller of the centrifugal pump for evaluating the dynamic radial force and hydraulic turbulence and noise. In recent years, domestic and foreign scholars have studied the unsteady flow, pressure pulsation and radial force pulsation of centrifugal pumps at different positions such as inside the shell wall and outlet of the impeller on the surface under different working conditions through calculation methods such as high-frequency pressure sensor, LDV laser measuring instrument and CFD program [4][5][6]. However, in these calculations, the fluid is all water.…”