基于CH<sup>*</sup>发射光谱的火焰二维温度分布测量

doi:10.3964/j.issn.1000-0593(2025)11-3098-07

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摘要：温度是燃烧诊断领域中的关键参数之一，获取火焰温度具有重要的科学意义和实用价值。分子发射光谱测温技术因其具备非接触测量，高测温上限，测量系统简便等优势，使得其常被用于高温高压等恶劣环境下的火焰温度测量。由于光栅光谱仪狭缝的维度限制，近年来关于该技术的研究多数仅限于零维和一维测量，难以达成通过单次测量获得火焰二维温度场的目标。因此在传统发射光谱测温系统的基础上加入一种二维转一维模块，对发射光谱二维测温技术展开研究。首先，根据分子发射光谱测温原理建立发射光谱拟合测温算法，形成发射光谱测温流程，并将2 500 K转动温度下的CH^*发射光谱仿真结果与分子发射光谱模拟软件LIFBASE生成的结果进行比对，得到二者间的决定系数R²=0.96，验证了光谱拟合测温算法的可行性；其次，对二维转一维模块进行设计，建立二维分布还原算法，形成火焰二维温度分布信息的获取过程，并基于二维转一维模块搭建发射光谱二维测量系统；最后，利用发射光谱二维测量系统对模型火箭发动机中局部火焰的CH^*发射光谱进行二维测量，对累加后的CH^*发射光谱进行去噪去基线处理，将仿真光谱与实测光谱进行拟合得出不同空间位置的温度，再利用二维分布还原算法得到局部火焰二维温度分布情况和对应光谱拟合决定系数R²分布。从局部火焰二维温度分布测量结果中可得出本论文建立的测温系统能够对空间间隔为0.50 mm的两个温度数据点进行分辨，且二维温度分布测量结果符合火焰形态；在光谱拟合R²二维分布中所有R²＞0.8，且R²＞0.9的位置占比达76.5%，验证了温度测量结果的可靠性。

关键词：发射光谱；二维测温；光谱拟合

Abstract：Temperature is one of the critical parameters in combustion diagnostics, and obtaining flame temperature holds important scientific significance and practical value. Molecular emission spectra thermometry, owing to its non-contact measurement capability, high upper temperature measurement limit, and simple system configuration, is frequently employed for flame temperature measurement in harsh environments characterized by high temperature and pressure. Constrained by the dimensional limitation of the slit in the grating spectrometer, most of the recent research on this technique has been confined to zero-dimensional (0D) and one-dimensional (1D) measurements, making it difficult to achieve the goal of obtaining a two-dimensional (2D) temperature field of flame through a single measurement. Therefore, this paper incorporated a 2D-to-1D conversion module into the traditional emission spectra temperature measurement system and investigated 2D emission spectra thermometry. Firstly, the emission spectral fitting thermometry algorithm was established based on the principle of molecular emission spectra thermometry, and the process of emission spectra thermometry was formulated. The simulated result of the CH^* emission spectrum at a rotational temperature of 2 500 K was compared with the spectrum generated by the molecular emission spectrum simulation software LIFBASE, yielding the coefficient of determination (R²) of 0.96. This verified the feasibility of the emission spectral fitting thermometry algorithm. Secondly, the 2D-to-1D conversion module was designed, a 2D distribution reconstruction algorithm was established, and the process for acquiring the 2D temperature distribution of the flame was developed. Furthermore, a 2D emission spectra measurement system was constructed based on the 2D-to-1D conversion module. Finally, the 2D emission spectra measurement system was employed to conduct 2D measurement of CH^* emission spectra from the local flame within a model rocket engine. The accumulated CH^*emission spectra were subjected to denoising and baseline removal. The temperatures at different spatial positions were derived by fitting simulated spectra to the measured spectra. Subsequently, the 2D distribution reconstruction algorithm was applied to obtain the local flame's 2D temperature field and the corresponding R² profile of spectral fitting. From the measurement result of the 2D temperature distribution of local flame, it can be concluded that the temperature measurement system constructed in this paper is capable of resolving two temperature data points with the spatial interval of 0.50 mm, and the measurement result of 2D temperature distribution is consistent with the flame morphology. In the 2D distribution of spectral fitting R², all R² values are greater than 0.8, and positions with R²>0.9 account for 76.5%, which validates the reliability of the temperature measurement result.

Key words：Emission spectra;2D temperature measurement;Spectral fitting

收稿日期: 2025-07-10 修订日期: 2025-09-14

中图分类号:

O433.4

基金资助: 国家自然科学基金项目（62305087）资助

通讯作者: 杨超博 E-mail: yangchaobo@hit.edu.cn

作者简介: 王绎嘉，2001年生，哈尔滨工业大学航天学院及光电子技术研究所，激光空间信息全国重点实验室硕士研究生
e-mail: Wangyj123000@163.com

引用本文:

王绎嘉，杨超博，曹振，彭江波，俞南嘉，韩明宏，李蔚然，张续腾，于欣. 基于CH^*发射光谱的火焰二维温度分布测量[J]. 光谱学与光谱分析, 2025, 45(11): 3098-3104.
WANG Yi-jia, YANG Chao-bo, CAO Zhen, PENG Jiang-bo, YU Nan-jia, HAN Ming-hong, LI Wei-ran, ZHANG Xu-teng, YU Xin. Measurement of Flame 2D Temperature Distribution Based on CH^* Emission Spectra. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2025, 45(11): 3098-3104.

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