Abstract
Vane number is an important parameter of IGV device, which indirectly affects hydraulic performance and pressure pulsation characteristics of the attached pump. In this study, based on an IS pump, the influences of vane number on hydraulic performance and pressure pulsation characteristics were considered. Four set of IGV devices were generated to assemble to the pump with 5, 6, 7 and 9 vanes, respectively. Then the three-dimensional unsteady flow fields were simulated using RNG k-ε turbulence model and sliding mesh by Fluent-16.0. The numerical results showed good agreement with the experimental data, which validated the numerical models. The effects of vane number on pump head and efficiency are different. 6 vanes IGV device can produce higher head while 7 or 9 vanes can bring about higher efficiency. Similarly, the influences of vane number on pressure pulsation in time domain and frequency domain are also complex. 6 vanes IGV device can remarkably decrease power spectral density at all flow rate conditions, but 7 vanes IGV device can improve pump pressure pulsation characteristics and realize better hydraulic stability. Therefore, it is hard to determine the best vane number, but 6 vanes IGV device is suggested for engineering application to obtain better hydraulic performance.
Highlights
Centrifugal pump is widely applied in petrochemical industry, irrigation, aerospace, urban water supply and drainage, water conservancy, hydropower engineering and other areas of national economy due to its relatively compact structure and wide application field
In order to reduce the influence of boundary condition on final solution at inlet and outlet using Computational Fluid Dynamics (CFD) method, five times of its diameter is extended at inlet guide vane (IGV) inlet and volute outlet
In the work, the point is taken as the unique monitoring point to study the effect of vane number of IGV device such as 0, 5, 6, 7 and 9 on pressure pulsation characteristic
Summary
Centrifugal pump is widely applied in petrochemical industry, irrigation, aerospace, urban water supply and drainage, water conservancy, hydropower engineering and other areas of national economy due to its relatively compact structure and wide application field. The pre-whirl regulation technique using inlet guide vane (IGV) has been validated in industry such as centrifugal compressor and fan [2, 3]. A CFD STUDY OF IGV VANE NUMBER ON HYDRAULIC CHARACTERISTICS AND PRESSURE PULSATION OF AN IS CENTRIFUGAL PUMP. In this study, based on the previous research [22,23,24], the pressure pulsation for an IS centrifugal pump, installed with different sets of pre-whirl regulation devices with vane number being 5, 6, 7 and 9, was investigated by means of Computational Fluid Dynamics (CFD) method. The influence of vane number on pre-whirl regulation effect on whole pump was given from the view of head and hydraulic efficiency under three selected flow rate conditions. The time domain and frequency domain characteristics analysis of pressure pulsation under different vane numbers were investigated
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