An efficient regulation approach for tomographic reconstruction in combustion diagnostics based on TDLAS method

作     者：Mingyuan XIN Junling SONG Wei RAO Yanji HONG Yajing JIANG Mingyuan XIN;Junling SONG;Wei RAO;Yanji HONG;Yajing JIANG

作者机构：State Key Laboratory of Laser Propulsion&ApplicationSpace Engineering UniversityBeijing 101416China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2020年第33卷第12期

页      面：3158-3166页

核心收录：

学科分类：082502[工学-航空宇航推进理论与工程] 08[工学] 0825[工学-航空宇航科学与技术] 

基　　金：supported by the Beijing Natural Science Foundation(No.1194028) National Natural Science Foundation of China(No.61505263) State Key Laboratory of Laser Propulsion&Application Foundation(Nos.SKLLPA-03 and SKLLPA-15) 

主　　题：Absorption spectroscopy Combustion Number of rays Regulation function Tomographic reconstruction 

摘      要：For tomographic reconstruction in combustion diagnostics,it is usually necessary to solve a rank-deficient problem,where the number of non-linear dependent equations is smaller than the number of *** some reconstructions,there are grids without rays passing *** produces artifacts during the *** this paper,the weight of the regulation equation is modified with the number of the rays crossing the grid *** effect of the neighboring grid values as well as the number of rays crossing the grid cells is considered in the new regulation *** simulation results show that the new regulation method suppresses the reconstruction error of the no rays crossing grid and successfully restrains the corner distortion in four projection *** effects of the weight coefficient and the smoothing factor on the reconstruction are examined through a numerical ***,a combustion experiment demonstrates that the new regulation method can significantly reduce the reconstructed error,especially for the nonray crossing condition,and the results are compared with thermocouple measurements and reconstructions without modified regulation.