Airflow diagnostics of HEK-X expansion tube flows using multi-pass laser absorption spectroscopy installed in the test chamber

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-05-26 DOI:10.1016/j.vacuum.2025.114448

Hayato Nogami , Hotaka Matsumoto , Makoto Matsui , Shuto Yatsuyanagi , Hideyuki Tanno

引用次数: 0

Abstract

Airflow diagnostics of the Japan Aerospace Exploration Agency (JAXA) HEK-X expansion tube were performed using laser absorption spectroscopy, targeting the molecular oxygen line at 763 nm. A multi-pass cell was constructed inside the test chamber to increase the sensitivity by a factor of 166. The entire measurement system was fixed to the chamber with an antivibration gel to suppress the mechanical vibration caused by recoil at the beginning of the operation. Consequently, the absorption signal was detected at a flow velocity of 5.6 km/s. For the profile analysis, conventional Voigt fitting could not be applied to the measured profile because of the poor signal-to-noise ratio. The absorption profile was analyzed using the area method with measured static pressure. The translational temperature and specific enthalpy were estimated as 900 ± 40 K and 16.7 ± 0.7 MJ/kg, respectively.

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利用安装在测试室内的多通激光吸收光谱对HEK-X膨胀管流动进行气流诊断

利用激光吸收光谱对日本宇宙航空研究开发机构（JAXA） HEK-X膨胀管进行气流诊断，目标是763 nm的分子氧谱线。在测试室内构建了一个多通道细胞，将灵敏度提高了166倍。整个测量系统用防振凝胶固定在腔室上，以抑制操作开始时后坐力引起的机械振动。因此，在5.6 km/s的流速下检测到吸收信号。在剖面分析中，由于实测剖面信噪比较差，传统的Voigt拟合无法应用于实测剖面。采用实测静压面积法分析了吸收剖面。结果表明，转化温度为900±40 K，比焓为16.7±0.7 MJ/kg。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.