基于耦合模型的电容法两相流相含率测量性能分析

Performance analysis of capacitance sensor in two-phase flow phase holdup measurement based on coupled model

对于电学法多相流参数检测系统,电学传感器的结构是影响测量系统性能优劣的关键因素之一。目前,常采用静电场仿真或大量的实测试验来选择传感器结构及参数,然而,静电场仿真只能研究传感器的静态电学特征,并不能结合实际的多相流流动特性,且试验验证需要消耗大量的人力、物力及时间来应对不同对象及应用条件。针对以上问题,该文采用一种流场-电场耦合的三维动态仿真方法,建立混合流体的分布状态与电学传感器输出信号变化之间的关系,结合多相流流动特性综合评估传感器系统的测量性能。该耦合模型以气固两相流相含率检测为研究对象,分别对3种传感器系统的灵敏度和相关系数进行量化分析,以评估它们的测量性能,并在搭建的气固两相流相含率测量平台上验证该耦合模型的有效性。

The structure of the electrical sensor is one of the key factors that affect the performance of the multiphase flow measurement system.At present,electrostatic field simulation or a large number of field tests are often used to decide the sensor structure and parameters.However,the simulation analysis of electrostatic field cannot be combined with the flow characteristics of multiphase flow,and for different application objects and working conditions,the field test requires a lot of manpower,material resources and time.In view of the above problems,a three-dimensional dynamic simulation method of fluid-electric coupled fields is adopted in this paper to establish the relationship between the distribution state of mixed flow and the output signal of electrical sensor,and the measurement performance of the sensor system is comprehensively evaluated by combining the flow characteristics of multiphase flow.Taking gas-solid two-phase flow phase holdup detection as the application object,the sensitivity and correlation coefficients of three types of array sensor systems were quantitatively analyzed to evaluate their measurement performance,and the validity of the coupling model scheme was verified on the built gas-solid two-phase flow phase holdup measurement platform.