层析吸收光谱法用于具有逆浓度梯度的层流射流中 HO 传递。

Tomographic Absorption Spectroscopy for HO Transport in a Laminar Jet with Inverse Concentration Gradient.

机构信息

School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China.

Key Laboratory of Low-Grade Energy Utilization Technologies and Systems and School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.

出版信息

Sensors (Basel). 2022 Aug 9;22(16):5939. doi: 10.3390/s22165939.

DOI:10.3390/s22165939

PMID:36015709

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9412338/

Abstract

We report a tomographic absorption spectroscopy (TAS) study of water vapor transport in a laminar jet issuing into the ambient. The jet was generated using compressed dry air that was straightened by a honeycomb and a smooth contraction nozzle. A TAS scheme using the water vapor in the ambient as absorbing species and the absorption line near 1368.598 nm was proposed to study the HO transport in the laminar jet with an inverse concentration gradient. One-dimensional tomography was conducted at various heights above the nozzle, and the results were validated by the predictions from computational fluid dynamics (CFD) simulations. Particularly, the variations in the concentration gradient in the shear layer at different heights were captured. The 2D distribution of water concentration in the dry laminar jet was obtained experimentally. The present study shows that TAS has great potential in the research of mass transfer and scalar field of gaseous flows.

摘要

我们报告了一项层析吸收光谱（TAS）研究，该研究针对的是水蒸气在进入环境时的层流射流中的传输。射流是使用压缩干燥空气产生的，空气通过蜂窝状结构和平滑收缩喷嘴进行了拉直处理。我们提出了一种使用环境中的水蒸气作为吸收物质、并利用 1368.598nm 附近的吸收线的 TAS 方案，以研究具有逆浓度梯度的层流射流中的 HO 传输。在喷嘴上方的不同高度进行了一维层析成像，结果通过计算流体动力学（CFD）模拟的预测进行了验证。特别是，在不同高度处捕捉到了剪切层中浓度梯度的变化。实验获得了干燥层流射流中水蒸气浓度的二维分布。本研究表明，TAS 在气态流的传质和标量场研究中具有巨大的潜力。