实验流体力学2025，Vol.39Issue(2)：38-45,8.DOI:10.11729/syltlx20220099
免标定波长调制吸收光谱技术在高焓流场诊断中的应用
Application of a calibration-free wavelength modulation spectroscopy in the diagnosis of high-enthalpy flow field
摘要
Abstract
Parameters of the high-temperature gas in the high-enthalpy flow field arean important basis for analyzing the thermochemical characteristics of the high-enthalpy flow and its interaction mechanism with exothermic materials.However,due to the high temperature of the flow field and severe chemical reaction,the measurement signals of these parameters are difficult to calibrate,which makes quantitative measurement difficult all the time.Wavelength Modulation Spectroscopy(WMS)is a kind of Tunable Diode Laser Absorption Spectroscopy(TDLAS),which has stronger anti-interference ability and is more suitable for complex environment application compared with the direct absorption method.A calibration-freed data processing method of WMS has been realized by fitting the measured harmonic signal with the theoretical harmonic signal,and applied in the diagnosis of the high frequency induction plasma flow and thearc-heated flow.The results show that the temperature and electronic density in the plasma flow resolved by the WMS are very close to those measured by the direct TDLAS,and the relative error of the specific enthalpy in the arc-heated flow between the WMS and the energy balance method is about 10%,which indicates that the free-calibrated WMS is reliable and can be used as an effective tool in the quantitative measurement of the high-enthalpy flow.关键词
激光吸收/波长调制光谱/高焓流场/电弧加热/高频感应等离子体/免标定Key words
laser absorption/wavelength modulation spectroscopy/high-enthalpy flow/arc-heat/high frequency induction plasma/calibration-free分类
能源科技引用本文复制引用
陈卫,王磊,伍越..免标定波长调制吸收光谱技术在高焓流场诊断中的应用[J].实验流体力学,2025,39(2):38-45,8.基金项目
国家重点研发计划资助项目(2020YFA0405700) （2020YFA0405700）
