Abstract:

The phase-isolation technology of multiphase flow in-pipe is widely used in scientific research and engineering area. Based on the application of the phase-isolation technology on single-phase flow measurement, the mechanism of radial differential pressure used in multiphase flow measurement was studied by taking oil-water two-phase flow as an example, and the experimental verification was carried out. The theoretical analysis showed that the radial differential pressure between the pipe wall and pipe center of a cross section downstream of the swirler has a functional relationship between the mass flowrate and oil cut. Once measuring the radial differential pressure between the pipe wall and pipe center of a cross section downstream of the swirler, the mass flowrate and oil cut can be determined if either of the two parameters was known. The experimental results showed that the relative error of oil cut was less than 8.02% for the cross section of 0.075 m or 0.115 m downstream of the swirler, and mass flowrate was less than 1.44%, which provides a theoretical basis for further study of the two-parameter measurement of multiphase flow.

Key words: phase-isolation in-pipe, radial differential pressure, multiphase flow

摘要：

在管内相分隔技术产生的径向压差应用在单相流测量的基础上，以油水两相流为例，系统地研究了基于管内相分隔产生的径向压差在多相流测量的理论机理，并进行了实验验证。理论分析表明，在管内相分隔状态下，旋流器下游某截面壁面和管中心的径向压差与油水两相流的总质量流量和体积含油率呈一定函数关系，当测量出旋流器下游某截面壁面和管中心的径向压差后，若油水两相流的总质量流量和体积含油率中的任一参数已知，就可以求出另一参数。实验结果显示，在旋流器下游0.075 m和0.115 m的截面上，体积含油率的实验值与理论值的相对误差均在±8.02%以内，此时油水两相流总质量流量的实验值与理论值的相对误差均在±1.44%以内。

关键词: 管内相分隔, 径向压差, 多相流