Volumetric imaging of flame refractive index, density, and temperature using background-oriented Schlieren tomography

作     者：LIU HeCong HUANG JianQing LI Lei CAI WeiWei LIU HeCong;HUANG JianQing;LI Lei;CAI WeiWei

作者机构：School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2021年第64卷第1期

页      面：98-110页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 51706141&51976122) 

主　　题：Schlieren tomography combustion diagnostics temperature 

摘      要：Volumetric imaging represents one of the major development trends of flow diagnostics due to both the advancement in hardware and the requirement for more information to further understand complicated turbulent and/or reactive flows. Backgroundoriented Schlieren tomography(BOST) has become increasingly popular due to its experimental simplicity. It has been demonstrated to be capable of simultaneously recovering the distributions of refractive index, density, and temperature of ***, its capability in thermometry has only been demonstrated under the axisymmetric assumption, which greatly limits its applicability. In this work, we dedicated to developing a cost-effective BOST system for the simultaneous retrieval of refractive index, density, and temperature distributions for the asymmetric flame. A few representative tomographic inversion algorithms were assessed as well. Both numerical and experimental demonstrations were conducted and the results show that our implemented BOST can successfully reconstruct the three-dimensional temperature distribution with a satisfactory accuracy.