基于变转速控制的对旋轴流泵混输特性分析  

Analysis of Mixed Transportation Characteristics of Counter Rotating Axial Flow Pump Based on Variable Speed Control

作　　者：韩伟[1] 徐俊 史凤霞[1] 黄心愿 李志雄 米建东 HAN Wei;XU Jun;SHI Feng-xia;HUANG Xin-yuan;LI Zhi-xiong;MI Jian-dong(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《液压气动与密封》2022年第9期6-13,共8页Hydraulics Pneumatics & Seals

基　　金：国家自然基金(2018YFB0606100);甘肃省水利科学研究与技术推广项目(甘水建管发[2021]71号)。

摘　　要：由前置叶轮和后置叶轮反向旋转组成的对旋轴流泵有设计结构更紧凑、效率更高、性能更好的特点。由于气液混输泵是现代石油勘探及输送技术的一个重要研究方向,因此有必要研究对旋轴流泵的气液混输特性。应用计算流体力学的方法对不同工况下的对旋轴流泵进行数值模拟。分析对旋轴流泵的载荷分布以及变转速控制对其内部流动结构、气相分布的影响。计算结果表明:气相向轮毂侧移动,液相向轮缘侧流动,后置叶轮的气相聚集现象比前置叶轮更明显,气相聚集在逆压力梯度区域。分析了变转速控制法对混输泵性能的影响,两种变转速控制方法均能提高扬程和效率。在前置叶轮转速控制法(CFS)中湍动能变化曲线是单峰曲线;在后置叶轮转速控制法(CRS)中湍动能变化是双峰曲线。比较两种叶轮控制方法的湍流动能轴向分布曲线,发现前置叶轮控制方法的湍动能曲线均高于后叶轮控制方法的湍动能曲线,表明前置叶轮转速控制法湍流扩散程度更剧烈。The counter rotating axial flow pump composed of front impeller and rear impeller has the characteristics of more compact design structure,higher efficiency and better performance.As the oil-gas mixed transportation pump is an important research direction of modern oil production and transportation technology,it is necessary to study the gas-liquid mixed transportation characteristics of counter rotating axial flow pump.The numerical simulation of counter rotating axial flow pump under different working conditions is carried out by using the method of computational fluid dynamics.The load distribution of counter rotating axial flow pump and the influence of variable speed control on its internal flow structure and gas phase distribution are analyzed.The calculation results show that the gas phase moves to the hub side and the liquid phase flows to the rim side.The gas phase accumulation phenomenon of the rear impeller is more obvious than that of the front impeller,and the gas phase accumulates in the area of reverse pressure gradient.The influence of variable speed control method on the performance of mixed transport pump is analyzed.Both variable speed control methods can improve the head and efficiency.In the front impeller speed control method(CFS),the change curve of turbulent kinetic energy is a single peak curve;In the post impeller speed control method(CRS),the change of turbulent kinetic energy is a bimodal curve.Comparing the axial distribution curves of turbulent kinetic energy of the two impeller control methods,it is found that the turbulent kinetic energy curves of the front impeller control method are higher than those of the rear impeller control method,indicating that the turbulent diffusion degree of the front impeller speed control method is more intense.

关 键 词：对旋轴流泵 混输特性 数值模拟 变转速控制 气相聚集 

分 类 号：TH137[机械工程—机械制造及自动化]