Abstract
Based on the dynamic mesh technology, the moving grids of the double-suction screw multiphase pump were generated by the software SCORG. Then the three-dimensional transient simulation model was established to investigate the two-phase flow mechanism inside the screw pump under different inlet gas volume fraction (IGVF). The results show that the pressure inside the working chamber increases step by step from inlet to outlet and is symmetrical. The pressure drops sharply at the inlet of circumferential clearance and then decrease linearly in the clearance. The curved flow in suction and discharge flow passage causes the gas separation and high gas volume fraction (GVF) area in suction and discharge chamber. Four vortices in cross section of discharge pipe cause four high GVF areas due to the centrifugal force produced by the vortices. The high GVF areas scatter in working chambers and change slightly with the rotation angle except the last chamber under the IGVF 10%. The two-phase leakage flow shows layered flow where the gas concentrates at the bottom of the gap. Thus, the high GVF areas on the surface of the rotors mainly exist at the position of gaps. The work will provide instructions for improving its performance under high IGVF.
Highlights
With the rapid development of the petroleum industry, to develop onshore sight oilfields, satellite oilfields, and desert oilfields, especially offshore oilfields, has received more and more attention
The high gas volume fraction (GVF) areas scatter in working chambers and change slightly with the rotation angle except the last chamber under the inlet gas volume fraction (IGVF) 10%
The high GVF areas on the surface of the rotors mainly exist at the position of gaps
Summary
With the rapid development of the petroleum industry, to develop onshore sight oilfields, satellite oilfields, and desert oilfields, especially offshore oilfields, has received more and more attention. Partil [13] considered the effect of screw rotor rotation in the steady state CFD numerical calculations using the method of translational reference frame and conducted the calculation of three-dimensional flow field of a twin-screw multiphase pump under the condition of 50% IGVF; the accuracy of CFD model was verified by experimental test; and the effect of bubble size and inlet pressure on tip leakage, tooth root leakage and wall pressure distribution was studied and the results showed that the tooth root leakage flow is mainly gas flow. A set of moving mesh of a twin-screw multiphase pump was generated based on a dynamic mesh technology, the three-dimensional transient simulation model was established to investigate the two-phase flow mechanism inside the screw pump under different inlet gas volume fraction (IGVF) The work aims to improve the performance of double suction twin-screw multiphase pump
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