基于电容层析的LN_(2)-VN_(2)两相流成像经典算法比较研究  

Comparative study of typical imaging algorithm for electrical capacitive tomography applied to LN_(2)-VN_(2) two-phase flow

作　　者：吕海舟 王涛 周凯 谢黄骏 田泽南 朱松强 张小斌[3] Lv Haizhou;Wang Tao;Zhou Kai;Xie Huangjun;Tian Zenan;Zhu Songqiang;Zhang Xiaobin(Zhejiang Energy Natural Gas Group Co.,Ltd.,Hangzhou 310051,China;Aerospace Engineering System Shanghai,Shanghai 201109,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]上海宇航系统工程研究所,上海201109 [3]浙江大学制冷与低温研究所,杭州310027 [4]浙江能源集团有限公司,杭州310027

出　　处：《低温工程》2023年第2期24-31,共8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：针对低温流体液气介电常数接近1的特点,基于八电极电容层析成像(ECT)传感器,通过定量对比图像误差和相关性系数,系统分析了线性反投影算法、Tikhonov正则化算法、Landweber迭代算法、迭代Tikhonov正则化算法、代数重建技术和同步代数重建技术等传统用于室温流体的线性算法,用于LN_(2)-VN_(2)两相流的反演图像精度,并指出了各算法优缺点。通过对比水-空气的反演图像,发现LN_(2)-VN_(2)反演过程ECT线性化误差较小,从而有更好的反演结果。In view of the characteristic that the dielectric constant ratio of liquid to gas for cryogenic fluids was close to 1,the inversion image accuracy of the traditional linear algorithm for room temperature fluid for LN_(2)-VN_(2)two-phase flow was analyzed systematically based on the eight-electrode capacitance tomography(ECT)sensor,through quantitative comparison of image error and correlation coefficient.The advantages and disadvantages of each algorithm were pointed out.These commonly-used algorithms include the linear back-projection algorithm,Tikhonov regularization algorithm,Landweber iterative algorithm,iterative Tikhonov regularization algorithm,algebraic reconstruction technology,and synchronous algebraic reconstruction technology.It is found that the ECT linearization error of cryogenic fluid is small and has better inversion results by comparing the inversion images of water-air and LN_(2)-VN_(2).

关 键 词：ECT 低温流体 相分布 反演算法 

分 类 号：TB613[一般工业技术—制冷工程]