宽量程高速电阻层析成像系统设计与实验研究  

Design and experimental study of electrical resistance tomography system with wide range and high speed

作　　者：贡益明 孔德仁[2] 商飞[2] GONG Yiming;KONG Deren;SHANG Fei(College of Aeronautical Engineering,Jiangsu Aviation Technical College,Zhenjiang 212134,China;College of Mechanical Engineering,Nanjing University of Science and Tech,Nanjing 210094,China)

机构地区：[1]江苏航空职业技术学院航空工程学院,江苏镇江212134 [2]南京理工大学机械工程学院,江苏南京210094

出　　处：《实验技术与管理》2024年第4期147-154,共8页Experimental Technology and Management

基　　金：江苏航空职业技术学院2022年度院级课题(JATC22010103);国家自然科学基金项目(61401211)。

摘　　要：为准确识别水下冲压发动机工作管道截面气液两相流流型,该文提出将电阻层析成像(ERT)技术用于管道截面的图像重建。基于现场可编程门阵列(FPGA)控制器设计了一套12电极的管道截面高速ERT成像系统,系统采用线性反投影算法对截面图像进行重建,通过实验验证了系统测量结果的正确性以及图像重建的可行性。实验结果表明系统量程可达10 k?、实时测速可达51 f/s,能够准确测量管道截面敏感场内的边界电压,可对模拟环境中的水下冲压发动机管道截面进行图像重建。[Objective]The operation of underwater two-phase flow ramjet engines generates several bubbles,and the combined flow of gas and water produces a gas-liquid two-phase flow.If bubbles in a gas-liquid two-phase flow can be uniformly distributed on the inner side of a ramjet engine pipeline,it is beneficial for bubbles to work on water,which can effectively increase the engine thrust.When high-pressure gas is introduced into the engine pipeline,it is necessary to obtain real-time cross-sectional images to ensure that the generated gas-liquid two-phase flow pattern is a bubbly flow.Electrical resistance tomography(ERT)is an important method used for multiphase flow detection.The excitation source circuit of traditional imaging systems designed based on the ERT principle mostly uses digital synthesis chips to directly generate sinusoidal currents.The maximum load capacity of the constant-current source circuit can only reach 2 kΩ.This scheme requires the addition of filtering circuits and phase-sensitive demodulation circuits in subsequent data processing circuits,which significantly improves the signal delay and slows down the measurement speed of the system,usually only reaching 27 frame/s.Due to the special working environment of an underwater two-phase ramjet engine,it generates a load of up to 6 kΩ.To improve the load capacity and measurement speed of the imaging system,it is necessary to design a wide-range and high-speed resistance tomography imaging system.[Methods]First,based on the working principle of the ERT system,the design circuit is divided into four basic modules:an excitation signal generation module(DC/AC switching unit,excitation constant-current source unit),a 12-electrode array module,a data acquisition module,and a main control module with a data processing function.The functional units of the measurement system are implemented within each module.Second,the system is calibrated,and reliability tests are conducted to ensure that the measurement range reaches the expected 10 kΩand can operate st

关 键 词：水下冲压发动机 管道截面 电阻层析成像 现场可编程门阵列(FPGA) 线性反投影算法 图像重建 

分 类 号：TM93[电气工程—电力电子与电力传动]