Abstract
A pump is one of the most important machines in the processes and flow systems. The operation of multistage centrifugal pumps could generate pressure fluctuations and instabilities that may be detrimental to the performance and integrity of the pump. In this paper, a numerical study of the influence of pressure fluctuations and unsteady flow patterns was undertaken in the pump flow channel of three configurations with different diffuser vane numbers. It was found that the amplitude of pressure fluctuation in the diffuser was increased gradually with the increase in number of diffuser vanes. The lower number of diffuser vanes was beneficial to obtain a weaker pressure fluctuation intensity. With the static pressure gradually increasing, the effects of impeller blade passing frequency attenuated gradually, and the effect of diffuser vanes was increased gradually.
Highlights
Centrifugal pumps are of vital importance for a variety of commercial and industrial applications [1], which could handle a great quantity of liquids at relatively high pressures [2].For those applications that require extremely high pressures, multistage centrifugal pumps, which usually have more than two or even up to dozens of stages, are used
Pei et al [12] focused on the numerical fluctuation is affected the number of impeller blades, the influence decreased gradually simulation ofmainly unsteady flowby under part-load conditions, the but results shown that the intensity of when the water flowed into the diffuser
It shows that at the impeller outlet and the impeller inlet, the pressure fluctuation is mainly affected by the impeller blade number, and the diffuser vane number has no effect on the pressure fluctuation at these locations
Summary
Centrifugal pumps are of vital importance for a variety of commercial and industrial applications [1], which could handle a great quantity of liquids at relatively high pressures [2]. Khalifa et al [8] investigated the pressure fluctuations and vibration in a single-stage centrifugal pump experimentally under different flow conditions. Dynamics) code TASC flow to study the pressure fluctuations in a centrifugal pump for three different flow rates They found that the volute gap and the arrangement of vanes have the greatest. Pei et al [12] focused on the numerical fluctuation is affected the number of impeller blades, the influence decreased gradually simulation ofmainly unsteady flowby under part-load conditions, the but results shown that the intensity of when the water flowed into the diffuser. [14] carried methods, out an experimental that the unsteady flow the andinfluence pump performance effected position betweenin the measurement to study of rotating mainly speed and flow by ratethe onrelative the pressure fluctuation a diffuser the volute. Solidmodel model of of three three configurations configurations with with different different diffuser vanes number
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