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DETERMINATION OF THE GAS TEMPERATURE PROFILE IN A LARGE-SCALE FURNACE USING A FAST/EFFICIENT INVERSION SCHEME FOR THE SRS TECHNIQUE

DOI: 10.1615/ICHMT.2004.RAD-4.370
11 pages

Hyun Keol Kim
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon, Korea

Tae-Ho Song
Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea

Abstract

Measurements of gas temperature profiles in a large-scale test furnace are made by inverting the measured spectral data at 4.3micron band with inversion algorithms. A 3.4m-long stainless steel tube is employed as the test furnace through which flue gas flows. Three inversion algorithms are tested: Modified Constrained Inversion Method (MCIM), Base Function-based Inversion Method (BFIM) and BFIM-based MCIM (BCIM). The CK-based WNB model is employed for calculation of spectral intensities during the inversion process. The overall performances of algorithms are scrutinized with the inversion results. To verify the accuracy, the inverted temperatures are compared with measured ones using thermocouples. BFIM is good for initial guess and MCIM is good for fine touch, while BCIM gives fairly good results for all cases considered. Thus, BCIM is considered to be applicable, with good accuracy and capability, to inverse problems in large-scale furnaces.

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