两相流电磁成像测量正问题研究

应用有限元方法对电磁流动成像测量进行正演仿真,模拟不同测量组合下各种流型的电势分布以及对应流型下各电极的测量电压值,最后模拟6种典型测量敏感场.仿真结果表明:介质分布不同是影响电势分布差异的根本原因;核心流测量电压值曲线呈简单"U"型变化,贴井壁泡流曲线变化规律不明显,层流曲线存在拐点;敏感场分布不均匀,不对称,且存在负值.正演模拟的结果验证了电磁成像测量方法的可行性,并为下一步传感器设计和图像重构奠定基础.

Study on the forward simulation of the two-phase flow electromagnetic tomography

Forward simulation of the two-phase flow electromagnetic tomography is finished by the finite element method (FEM).The potential distribution in pipeline under different flow types and the measured voltage values of poles are calculated,and finally six typical sensitivity fields are simulated.The simulation results show that the different medium distribution is the basic reason for influencing the potential distribution;the shape of the measured voltage curve of the core flow in the pipeline is "U",there is no variation law in the measured voltage curve of the bubble flow has no obvious feature,while that of the laminar flow has inflexion points.The sensitivity field distributions are inhomogeneous and asymmetrical,and some values are minus.The forward simulation results very the feasibility of the electromagnetic tomography measurement method,and they are also useful for the optimal design of the transducer and the reconstruction of the images.