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

A three-dimensional temperature and radiation information technology, applied in temperature distribution map, radiation pyrometry, optical radiation measurement, etc., can solve the problems of local optimal solution results, large flame radiation noise, and negative value solutions.

Active Publication Date: 2018-06-29
SOUTHEAST UNIV
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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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  • Flame three-dimensional temperature distribution reconstruction method based on bi-spectral radiation information
  • Flame three-dimensional temperature distribution reconstruction method based on bi-spectral radiation information
  • Flame three-dimensional temperature distribution reconstruction method based on bi-spectral radiation information

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Embodiment Construction

[0078] Below, the present invention will be further described in conjunction with accompanying drawing and specific embodiment:

[0079] Two (Case 1 and Case 2) flames with different temperature and absorption coefficient distributions, the temperature T (K) and absorption coefficient κ (m -1 ) is a symmetrical distribution, satisfying formulas (1) and (3) respectively, the temperature T(K) and absorption coefficient κ(m -1 ) is a symmetrical distribution, satisfying formulas (2) and (4) respectively. The height Z of the flame and the radius R of the bottom surface were set to be 30 mm and 8 mm, respectively.

[0080]

[0081]

[0082]

[0083]

[0084] In the formula, r, x, y and z are the coordinate values ​​in the radial direction, x-axis direction, y-axis direction and z-axis direction respectively,

[0085]The light field camera is used to collect the radiation intensity in different directions of the flame. The parameters of the light field camera are as fo...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/58G01J5/00
CPCG01J5/0018G01J5/58G01J5/485
Inventor 许传龙孙俊张彪王式民
Owner SOUTHEAST UNIV
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