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电弧加热器高温流场激光吸收光谱诊断

曾徽 陈连忠 林鑫 欧东斌 董永辉

曾徽, 陈连忠, 林鑫, 等. 电弧加热器高温流场激光吸收光谱诊断[J]. 实验流体力学, 2017, 31(4): 28-33. doi: 10.11729/syltlx20160179
引用本文: 曾徽, 陈连忠, 林鑫, 等. 电弧加热器高温流场激光吸收光谱诊断[J]. 实验流体力学, 2017, 31(4): 28-33. doi: 10.11729/syltlx20160179
Zeng Hui, Chen Lianzhong, Lin Xin, et al. Laser absorption spectroscopy diagnostics in the arc-heater of an arcjet facility[J]. Journal of Experiments in Fluid Mechanics, 2017, 31(4): 28-33. doi: 10.11729/syltlx20160179
Citation: Zeng Hui, Chen Lianzhong, Lin Xin, et al. Laser absorption spectroscopy diagnostics in the arc-heater of an arcjet facility[J]. Journal of Experiments in Fluid Mechanics, 2017, 31(4): 28-33. doi: 10.11729/syltlx20160179

电弧加热器高温流场激光吸收光谱诊断

doi: 10.11729/syltlx20160179
详细信息
    作者简介:

    曾徽:曾 徽(1989-), 男, 湖南益阳人, 工程师。研究方向:气动热试验分析、吸收光谱、发射光谱燃烧诊断。通信地址:北京市云岗西路17号中国航天空气动力技术研究院(100074)。E-mail:zenghuikeda@outlook.com

    通讯作者:

    林鑫, E-mail:linxin_bit@163.com

  • 中图分类号: V556.4

Laser absorption spectroscopy diagnostics in the arc-heater of an arcjet facility

  • 摘要: 气流温度和组分粒子数密度是定量评估电弧加热器运行参数和流场品质的关键,常规测试手段难以适应电弧加热器内高温气流的恶劣环境,电弧加热器等离子体气流诊断研究一直缺乏有效手段。本研究应用激光吸收光谱技术,选用原子O(777.19nm)谱线,基于局部热化学平衡等离子体假设,对电弧加热器内高温离解空气(>5000K)试验气流进行在线诊断。试验测得了总焓H0=15.8,17.4MJ/kg 2组工况下,电弧加热器内等离子体气流温度和原子O粒子数密度。2组工况获得平均气流温度分别为5843和6047K,对应高温平衡气流表获得气流温度为5950和6335K。测得加热器运行稳定后2组工况的原子O总粒子数密度在(1.1~1.2)×1018cm-3之间,低能级5S20粒子数密度在(1.0~1.6)×1010cm-3之间,2组工况原子O总粒子数密度的差异与NASA-CEA平衡计算结果一致,验证了电弧加热器气流局部热力学平衡假设的有效性。本研究工作验证了激光吸收光谱技术可作为高焓电弧加热器常规诊断手段。
  • 图  1  (2, 6)×105Pa压力下空气平衡等离子体组分浓度随温度的变化

    Figure  1.  Equilibrium gas composition for air plasma at different temperatures and at 2 and 6 atmospheric pressures

    图  2  电弧风洞及LAS光路系统示意图

    Figure  2.  Schematic of the experimental setup of the arc-heated wind tunnel and the LAS system

    图  3  单一工况下原始吸收信号,H0=15.8MJ/kg

    Figure  3.  Raw absorption signal under an operation condition, H0=15.8MJ/kg

    图  4  单个周期吸收信号及拟合结果

    Figure  4.  Results of absorbance and Voigt fitting in one period

    图  5  2组工况下测得的弧室等离子体气流温度

    Figure  5.  Measured temperature in the arc heater under two operation conditions

    图  6  2个工况下测得的弧室原子O粒子密度

    Figure  6.  Measured number density of atomic oxygen in the arc heater under two operation conditions

    表  1  原子O吸收跃迁(5P35S20)光谱参数

    Table  1.   Fundamental spectroscopic data for the O (5P35S20) transition

    λ0/nm Aul/106s-1 El/cm-1 Eu/cm-1 gl gu
    777.2 36.9 73768 86631 5 7
    下载: 导出CSV

    表  2  电弧加热器运行工况

    Table  2.   The operation conditions for the arc heater

    Test condition Bulk enthalpy H0/(MJ·kg-1) Chamber pressure p/105Pa Total temperature T0/K
    59-A 17.4 3.2 6335
    59-B 15.8 3.1 5950
    下载: 导出CSV
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    Ou D B, Chen L Z, Dong Y H, et al. Measurements of gas temperature and atomic oxygen density in the arc-heated wind tunnel based on TDLAS[J]. Joural of Experiments in Fluid Mechanics, 2015, 29(3):62-67. http://www.syltlx.com/CN/abstract/abstract10845.shtml
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  • 被引次数: 0
出版历程
  • 收稿日期:  2016-11-25
  • 修回日期:  2017-01-03
  • 刊出日期:  2017-08-25

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