Abstract
In order to research the regular pattern of the vortex within the oil-gas multiphase pump with the gas volume fraction changes, the standard K-epsilon turbulence model is selected, the gas-liquid two-phase flow field within the multiphase pump is calculated by the CFD software under the different gas volume fraction, the regular pattern of the vortex motion within the multiphase pump is analyzed under the different gas volume fraction. The results show that, from the impeller hub to the rim, the vortex in the guide vane is gradually become smaller, the vortex within the impeller is gradually obvious, and with the increase of the gas volume fraction, the flow separation, the backflow and the vortex phenomenon within the impeller and the guide vane are gradually increased. It is also found that the flow separation has a greater influence on the turbulent dissipation within the whole flow field, that is, the more serious the area of off flow, the greater the energy loss. The results provide an important theoretical basis for the optimal design of the structure of oil-gas multiphase pump.
Highlights
Vortex generation, development, change is a very complex physical process, the vortex distribution varies greatly with the gas volume fraction
In the oil-gas multiphase pump, due to high gas volume fraction, which leads to the vortex motion within the pump is more complex, often causes oil-gas multiphase pump gas plug and plug flow and so on, results in poor performance, cannot work normally
It can be seen that the effect of flow separation on the turbulence dissipation in the flow path of the multiphase pump is significant, and can be seen from figure7 to figure 9, with the gas volume fraction increases, the region where the maximum turbulent dissipation occurs gradually increases, the maximum turbulent dissipation value decreases
Summary
Development, change is a very complex physical process, the vortex distribution varies greatly with the gas volume fraction. Ma Xijin etc.[4] by using numerical simulation method, detailed analyzed the influence of blade number on the internal flow of axial-flow oil-gas multiphase pump. Zhang Jinya etc.[14] by setting the buffer equalizer in the front of the oil-gas multiphase pump, researched the visualization of the gas-liquid two-phase flow field of the inlet section of the pump, plotted the curves of the bubble diameter of the inlet of the pump with the change of the gas volume fraction and the pump rotating speed. Based on the above study, this paper through the numerical calculation method, the standard K-ε turbulence model is selected, under the gas volume fraction from the flow line distribution and turbulence dissipation analyzed the vortex motion in the flow field within the oil-gas multiphase pump. The turbulent kinetic energy k and the dissipation rate ε equation are as follows,
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