Visual measurement method for temperature distribution of annular combustion field

Abstract

The invention relates to a visual measurement method for temperature distribution of an annular combustion field. The method comprises the following specific operation steps: 1, collecting the local admittance rate and temperature data of a flame through an ionic current probe and a thermocouple probe according to the typical working condition of an annular combustor; 2, establishing a mapping model from the admittance rate of the combustion field to the temperature by using the measured data; 3, according to the structure of the annular combustor, designing an annular electrical tomography sensor, measuring mutual impedance of an electrode array distributed around a combustion field, and reconstructing distribution of conductivity and dielectric constant in the annular combustion field; and 4, substituting the reconstructed distribution data into the mapping model from the admittance rate to the temperature to obtain a temperature distribution image. The method provided by the invention is suitable for measuring the temperature distribution in the combustion field of a combustor with a complex annular structure, does not need an optical window, has the advantages of no contact, no radiation, simple structure, low cost and the like, and has important practical value and application prospect.

Description

technical field [0001] The invention relates to a visual measurement method for the temperature distribution of an annular combustion field, which belongs to the field of dynamic monitoring of the combustion field. Background technique [0002] Combustion is the main form of energy conversion and widely exists in industrial processes. Temperature measurement data can be used to improve combustion process control technology and optimize combustion chamber design to meet energy saving and low emission requirements. Thermocouples and pyrometers are the most commonly used equipment for temperature measurement in combustion fields. However, thermocouples and pyrometers are invasive or contact, and a single measurement can only reflect the local temperature information of the entire combustion field. Passive temperature measurement technology based on flame radiation has achieved certain applications in industrial processes. Active spectral analysis technology based on optical in...

AI Technical Summary

Problems solved by technology

Although image reconstruction methods based on sensitivity matrices have been successfully applied, they also have their own limitations. These methods calculate the gray value of all points in the entire area. If only a small part of the entire area needs to be reconstructed, it will increase many unnecessary Necessary amount of calculation

In addition, the method of iteratively updating the sensitivity matrix is ​​very time-consuming, and the convergence has not been confirmed; at the same time, the sensitivity matrix method cannot simultaneously give the distribution information of the two modes

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