Flame three-dimensional temperature distribution reconstruction method based on bi-spectral radiation information

Abstract

The invention discloses a flame three-dimensional temperature distribution reconstruction method based on bi-spectral radiation information. The flame three-dimensional temperature distribution reconstruction method is characterized by comprising the following steps: 1) dividing a flame microelement according to acquired flame bi-spectral radiation information and establishing a flame radiation transfer equation; 2) setting a target function, iteratively updating a flame absorption coefficient according to a reconstruction algorithm and reconstructing a flame three-dimensional temperature field. The flame three-dimensional temperature distribution reconstruction method based on the bi-spectral radiation information, disclosed by the invention, has the benefits that in the iterative solution process of the algorithm, a non-negative least squares algorithm is used, so that the non-negativity of the spectral radiation intensity of each of parts of flame can be guaranteed; the absorption coefficient of each of the parts of the updated flame is also mapped to a set interval, so that the non-negativity of the absorption coefficient is guaranteed; the algorithm has stronger robustness, isindependent of an initial value and can still maintain higher accuracy and better convergence under the situations that inputted data is larger in error, and a random numerical value is set without providing a priori iterative initial value.

Description

technical field [0001] The invention relates to a flame three-dimensional temperature distribution reconstruction method based on dual-spectrum radiation information, and belongs to the technical field of flame temperature measurement. Background technique [0002] Temperature is one of the most important parameters to characterize the combustion flame. The measurement of the three-dimensional temperature field of the flame plays a decisive role in the comprehensive analysis of the combustion reaction speed, three-dimensional structure, component formation, and overall characteristics of the flame. Engineering design improvement and operation optimization will ultimately have great significance for efficient use of energy and low pollution emissions. Therefore, the measurement of the three-dimensional temperature field of the flame is an important topic in the study of combustion flames. [0003] Temperature measurement technologies such as laser spectroscopy have disadvan...

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Problems solved by technology

However, currently proposed inversion algorithms such as LSQR-CG have no constraints on the non-negativity of the solution results. When solving the linear equation of radiative transfer of an actual flame, the flame radiation obtained by the measurement system (mainly a digital camera) exists Large noise, the solution result is easy to fall into local optimum or even produce negative value solution

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