Measurements and Modeling of Air Plasma Radiation in the VUV

IF 1.1 4区工程技术 Q4 ENGINEERING, MECHANICAL

Journal of Thermophysics and Heat Transfer Pub Date : 2023-05-21 DOI:10.2514/1.t6768

S. McGuire, C. Jacobs, Pierre B Mariotto, C. Grimaldi, A. Tibère-Inglesse, C. Laux

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Abstract

Measurements of high-temperature air emission spectra between 150 and 250 nm (VUV/UV) are presented. These measurements are calibrated in absolute intensity. The high-temperature air was produced using an atmospheric pressure plasma torch facility. The centerline temperature of the plasma jet is approximately 6700 K. A VUV emission spectroscopy system was adapted to the plasma torch facility to acquire spectra from 150 to 250 nm. Absolute intensity spectra were obtained in this wavelength range. They were compared with numerical predictions of the line-by-line spectroscopy code SPECAIR. The overall agreement between the SPECAIR predictions and measurements is good, particularly above 180 nm. Several modifications to the SPECAIR radiation code were carried out in order to improve agreement with experiments. These modifications significantly improved agreement though, at lower wavelengths, the data indicate that a source of emission remains unaccounted for by SPECAIR. Several possibilities for this missing source of emission are discussed, including photodissociation of the nitric oxide molecule.

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VUV中空气等离子体辐射的测量和模拟

给出了150和250nm之间的高温空气发射光谱（VUV/UV）的测量结果。这些测量值以绝对强度进行校准。高温空气是使用大气压等离子体炬设备生产的。等离子体射流的中心线温度约为6700K。VUV发射光谱系统适用于等离子体炬设备以获得150至250nm的光谱。在该波长范围内获得了绝对强度光谱。它们与逐行光谱代码SPECAIR的数值预测进行了比较。SPECAIR预测和测量之间的总体一致性良好，特别是在180nm以上。对SPECAIR辐射代码进行了几次修改，以提高与实验的一致性。这些修改显著改善了一致性，尽管在较低的波长下，数据表明SPECAIR仍然无法解释发射源。讨论了这种缺失发射源的几种可能性，包括一氧化氮分子的光解。

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来源期刊

Journal of Thermophysics and Heat Transfer 工程技术-工程：机械

CiteScore

3.50

自引率

19.00%

发文量

审稿时长

3 months

期刊介绍： This Journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. The Journal publishes qualified papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include aerothermodynamics; conductive, convective, radiative, and multiphase modes of heat transfer; micro- and nano-scale heat transfer; nonintrusive diagnostics; numerical and experimental techniques; plasma excitation and flow interactions; thermal systems; and thermophysical properties. Papers that review recent research developments in any of the prior topics are also solicited.