ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Multi-spectral measurement method for high-temperature surface temperature field through emissivity pre-recognition and White Shark optimization algorithm
Received date: 2024-12-13
Revised date: 2025-02-12
Accepted date: 2025-03-04
Online published: 2025-03-06
Supported by
National Natural Science Foundation of China(52376158);Innovation Capacity Building of Lianyungang City Science and Technology Plan Project(CX2207)
Multispectral thermometer is widely used for temperature measurement of high temperature components in gas turbines such as turbine blades and combustion chambers. However， without the prior emissivity information of the measured target， the multi-spectral thermometer often results in large measurement error， which limits its practical application. In this paper， a multi-spectrum radiation-based temperature inversion method integrating emissivity pre-recognition is proposed. This method transforms the underdetermined radiation equations into a constrained optimization problem of the objective function. Based on the grey body hypothesis and generalized inverse matrix method， the range of emissivity is firstly obtained and added to the objective function as a constraint. The White Shark optimization algorithm is further used to achieve the high-precision temperature solution of the constrained objective function. The key parameters and reconstruction performance of the proposed algorithm are discussed on the six simulated emissivity models at different temperatures. The simulation results showed that the maximum error of the temperature inversion is 1.95% at 800-1 000 K. Finally， the temperature measurement experiments are carried out on a high temperature surface in the lab. The maximum deviation of the measured temperature between the proposed method and the thermocouple is 2.01%， verifying that the proposed multi-spectral measurement method has high accuracy and stability.
Zhengjun ZHANG , Yizhi HUANG , Yan LIU , Biao ZHANG , Xiang XU , Chuanlong XU . Multi-spectral measurement method for high-temperature surface temperature field through emissivity pre-recognition and White Shark optimization algorithm[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(16) : 131662 -131662 . DOI: 10.7527/S1000-6893.2025.31662
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