低温流体电容层析成像空间分辨率研究  

Research on spatial resolution of capacitive tomography imaging for cryogenic fluids

作　　者：吕海舟 王涛 周凯 高鑫鑫 张小斌[2] 朱松强 Lv Haizhou;Wang Tao;Zhou Kai;Gao Xinxin;Zhang Xiaobin;Zhu Songqiang(Zhejiang Energy Natural Gas Group Co.,Ltd.,Hangzhou 310051,China;Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou 310027,China;Zhejiang Provincial Energy Group Company Ltd.,Hangzhou 310027,China)

机构地区：[1]浙江能源天然气集团有限公司,杭州310051 [2]浙江大学制冷与低温研究所,杭州310027 [3]浙江能源集团有限公司,杭州310027

出　　处：《低温工程》2023年第5期8-16,共9页Cryogenics

基　　金：国家自然科学基金(51976177)资助;国家重点研发计划(2022YFB4002900)。

摘　　要：为了深入探究电容层析成像(ECT)在用于低温流体(液汽介电常数比比室温介质小1个数量级以上)的两相流反演成像时的成像性能,基于数值模拟,对比确认最佳成像方法后,通过对比图像质量和成像定量指标研究了低温流体在4种两相流型下的成像空间分辨率。结果表明成像分辨率在测量中心区域为直径比0.2,边缘区域为0.1,影响因素包括主流体相对介电常数、两相介质的介电常数比、数据噪声等,其中分辨率对测量噪声尤为敏感。研究定量验证了ECT用于低温流体测量时的分辨率性能,并为未来传感器的优化指明了方向。In order to deeply explore the imaging performance of electrical capacitance tomography(ECT)in the inversion imaging of two-phase flow in cryogenic fluids(permittivity is more than 1 order of magnitude smaller than that of room temperature media).Based on numerical simulation,after comparing and confirming the best reconstruction method,the imaging spatial resolution of cryogenic fluid under four two-phase flow patterns was studied by comparing imaging quality and quantitative indicators.The results showed that the imaging resolution is about 0.2 times diameter in the central area and about 0.1 at the edge area during measurement.Influencing factors include the permittivity of the main fluid,the permittivity ratio of the two-phase medium,and data noise.Among them,resolution is particularly sensitive to measurement noise.The resolution performance of ECT for cryogenic fluid measurements is quantitatively validated and the directions for sensor optimization in future is pointed out.

关 键 词：电容层析成像 低温流体 空间分辨率 信噪比 介电常数 

分 类 号：TB613[一般工业技术—制冷工程] TB663