马希金,崔生磊,周贯五,张亚琼,张潮
Ma Xijin,Cui Shenglei,Zhou Guanwu,Zhang Yaqiong,Zhang Chao

• 1:兰州理工大学能源与动力工程学院
• 2:甘肃省流体机械及系统重点实验室
• 3:中国机械设备工程股份有限公司

摘要(Abstract)：

针对多相泵空间导叶局部压力过大的现象,以螺旋轴流式油气混输泵的导叶为研究对象,设计工况下以多相泵的扬程和效率提升以及降低导叶局部压力为优化目标,在保证动叶和复合导叶设计参数不变的前提下,通过CFD数值模拟计算不同复合短导叶安放位置与多相泵的水力效率之间的关系,从而寻找效率最优的复合短导叶安放位置。计算结果表明:多相泵复合短导叶的安放位置对多相泵的内流场和多相泵的外特性有重要影响,随着复合短导叶安放位置从流道后置到前置时,存在使泵效率最高的最优安放位置;当复合短导叶位于流道中部时,能有效抑制气液分离情况,削弱复合导叶尾部叶顶处局部压力过大现象以及提高了多相泵的水力效率;随着短导叶从流道出口移动到流道进口时,存在于导叶背部的低速脱流区会前移,且脱流区面积会增大,加重流道的堵塞。揭示了短导叶安放位置与多相泵内流场和外特性的关系,为多相泵导叶的优化设计提供了一定的理论依据。
Considering the phenomenon of excessive local pressure of the guide vanes of a multiphase pump,a relationship between different setting location of compound short guide vanes and hydraulic efficiency was calculated by CFD numerical simulation under the condition that the design parameters of movable vane and compound guide vanes are guaranteed to remain unchanged by taking the guide vanes of the helical axial-flow oil/gas multiphase transport pump as the research object and by taking the head and efficiency improvement of the multiphase pump and reduction of the local pressure of the guide vanes as the optimization objective.The calculation results show that the setting location of the compound short guide vanes has an important influence on the internal flow field and external characteristics of multiphase pump and there is a best setting location of short guide vanes with highest pump efficiency when the setting location of the compound short guide vanes moves from the rear of the flow passage to the front of the flow passage. When the compound short guide vanes are located in the middle of the passage,the separation of gas and liquid can be effectively suppressed,reducing the excessive local pressure on top of the tail of compound guide vanes and improving hydraulic efficiency of the multiphase pump. As the setting location of short guide vanes moves from the outlet of the flow passage to the inlet of the passage,the low-speed flow separation zone existing at the back of the guide vanes will move forward,and the area of the separation zone will expand, which aggravates blockage of the flow passage consequently. The relations between setting location of the short guide vanes and internal flow field and external characteristics of the multiphase pump are revealed,which provides some theoretical basis for the optimization design of guide vanes of multiphase pump.

关键词(KeyWords)： 多相泵;复合短导叶;内流场;脱流
multiphase pump;compound short guide vanes;internal flow field;flow separation

Abstract:

Keywords:

基金项目(Foundation): 甘肃省科技攻关项目(KG954-3-11)

作者(Author): 马希金,崔生磊,周贯五,张亚琼,张潮
Ma Xijin,Cui Shenglei,Zhou Guanwu,Zhang Yaqiong,Zhang Chao

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