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首页> 外文期刊>Journal of Spacecraft and Rockets >Near-Surface Carbon-Dioxide Tunable Diode Laser Absorption Spectroscopy Concentration Measurements in Hypervelocity Flow
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Near-Surface Carbon-Dioxide Tunable Diode Laser Absorption Spectroscopy Concentration Measurements in Hypervelocity Flow

机译：超高速流动中的近表面二氧化碳可调谐二极管激光吸收光谱浓度测量

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摘要

Measurements of carbon-dioxide concentration are made in the LENS-XX expansion tunnel at the CalspanUniversity at Buffalo Research Center to investigate the effects of surface catalysis in hypersonic flows. A tunable diode laser absorption spectroscopy setup probes the P36e CO2 absorption line of the 1+3 combination band at 2.7153m. Numerical simulations are computed with data-parallel line relaxation using the specified reaction efficiency surface catalysis model. Absorption measurements adjacent to the surface of an aluminum cylinder correlate well with simulations indicating low catalytic efficiency at the surface. The velocity, density, freestream temperature, specific enthalpy, and stagnation point pitot pressure of the run are 4.6km/s, 1.53g/m3, 1328.4K, 11.75MJ/kg, and 31.6kPa, respectively. Simulation of the absorption spectrum is performed using a nonhomogeneous line-by-line code using the high-resolution transmission molecular absorption database for spectroscopic parameters. Input data for the code are obtained from computational fluid dynamics simulations of the cylinder and facility. The specified reaction efficiency for the mechanism CO+OCO2 is determined inversely using detailed computational fluid dynamics and comparisons to experimental measurements. The best agreement was found for CO=0.00025 to 0.0005, indicating that the coupled line-by-line code and computational fluid dynamics approach is useful for assessing near-surface composition using tunable diode laser absorption measurements of hypersonic flows.
机译：在布法罗研究中心的Calspan大学的LENS-XX膨胀隧道中进行了二氧化碳浓度的测量，以研究表面催化在高超声速流动中的作用。可调二极管激光吸收光谱仪可在2.7153m处探测1 + 3组合谱带的P36e CO2吸收线。使用指定的反应效率表面催化模型，通过数据平行线松弛计算数值模拟。靠近铝制圆柱体表面的吸收测量值与模拟结果密切相关，模拟结果表明该表面的催化效率较低。运行的速度，密度，自由流温度，比焓和驻点皮托管压力分别为4.6km / s，1.53g / m3、1328.4K，11.75MJ / kg和31.6kPa。吸收光谱的模拟是使用非均匀的逐行代码，使用高分辨率透射分子吸收数据库进行光谱参数执行的。该代码的输入数据是从气缸和设施的计算流体动力学模拟中获得的。使用详细的计算流体动力学并与实验测量值进行比较，可以确定机理CO + OCO2的指定反应效率。对于CO = 0.00025至0.0005，发现了最佳协议，这表明逐行编码和计算流体动力学相结合的方法可用于使用高超声速流的可调二极管激光吸收测量来评估近地表成分。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2015年第6期|1551-1562|共12页
  • 作者

    Weisberger Joshua M.; DesJardin Paul E.; MacLean Matthew; Parker Ronald; Carr Zakery;

  • 作者单位

    SUNY Buffalo, Mech & Aerosp Engn, Buffalo, NY 14260 USA;

    SUNY Buffalo, Mech & Aerosp Engn, Buffalo, NY 14260 USA;

    Calspan Univ Buffalo Res Ctr, Buffalo, NY 14225 USA;

    Calspan Univ Buffalo Res Ctr, Buffalo, NY 14225 USA;

    Calspan Univ Buffalo Res Ctr, Buffalo, NY 14225 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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