混输泵半螺旋形吸入室不同含气率下的速度分析

Analysis of the Velocity Flow-field in the Semi-Volute Suction Chamber of a Multiphase Pump for Different Void Fractions

利用CFD模拟分析软件———STAR-CD,对油气混输泵半螺旋形吸入室在不同含气率下的流场进行了三维模拟分析。模拟结果显示流场速度变化较为均匀,表明这种半螺旋形吸入室作为混输泵的吸入室是合适的,只是在隔舌处会发生漩涡,出现气体滞留现象,并与流速大小和气体的含气量有关。根据分析结果,增大了隔舌处的圆弧半径,减小了出口端隔舌的厚度。样机试验表明,泵效率和含气率均明显提高,说明措施有效。

By using simulation-analysis software CFD(Computational Fluid Dynamics),STAR-CD,a three-dimensional simulation analysis was conducted of the semi-volute suction chamber of a gas-oil multiphase pump for flow fields at different void fractions.The results of the simulation indicate that the variation of flow field velocity is relatively uniform,showing that it is proper to use this kind of semi-volute suction chamber to serve as the suction chamber of a multi-phase pump. However,at a partition tongue location eddies may occur with the phenomenon of gas stagnation emerging,which is related to the magnitude of flow speed and the void fraction of gas.On the basis of analysis results the circular arc radius at the partition tongue location has been augmented and the thickness of the outlet-end partition tongue decreased.The test of a sample machine indicates that there is a significant enhancement of pump efficiency and void fraction,demonstrating the effectiveness of the measures being taken.