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Spatially Resolved Water Measurements in a Scramjet Combustor Using Diode Laser Absorption

机译:Scramjet燃烧器中使用二极管激光吸收的空间分辨水测量

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摘要

A two-color tunable diode laser sensor for detection of H_2O absorption near 1.4 μm was used to simultaneously determine temperature, H_2O column density, and velocity in a direct-connect scramjet combustor. Axial and transverse spatial resolutions were achieved by translating the measurement line of sight across and along the flowpath with measurements spanning six axial planes and 24 measurement lines of sight in each plane. Results are presented for a uniform noncombusting H_2O-seeded case as well as for H_2 air combustion at equivalence ratios of 0.17 and 0.46. A combination of wavelength-modulation spectroscopy and scanned-wavelength direct absorption were used to mitigate nonuniform gas conditions along the measurement line of sight present in the combustion cases. Comparisons of tunable diode laser absorption spectroscopy measurements with computational fluid dynamics simulations are included and illustrate the use of line-of-sight tunable diode laser absorption spectroscopy to validate computational efforts. Additional comparisons with coherent anti-Stokes Raman scattering measurements in the same model scramjet corroborate many key findings from tunable diode laser absorption spectroscopy.
机译:用于检测1.4μm附近H_2O吸收的双色可调谐二极管激光传感器用于同时确定直接连接超燃冲压燃烧器中的温度,H_2O柱密度和速度。轴向和横向空间分辨率是通过跨和沿流径平移测量视线获得的,测量跨六个轴向平面,每个平面中有24个测量视线。给出了均质不燃H_2O播种情况以及当量比为0.17和0.46的H_2空气燃烧的结果。结合使用了波长调制光谱和扫描波长直接吸收技术,可减轻燃烧情况下沿测量视线的不均匀气体条件。包括了可调谐二极管激光吸收光谱测量与计算流体动力学模拟的比较,并说明了使用视线可调谐二极管激光吸收光谱来验证计算工作。在同一模型超燃冲压发动机中,相干抗斯托克斯拉曼散射测量的其他比较证实了可调谐二极管激光吸收光谱学的许多关键发现。

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  • 来源
    《Journal of propulsion and power》 |2014年第6期|1551-1558|共8页
  • 作者单位

    Stanford University, Stanford, California 94305,Department of Mechanical Engineering, 452 Escondido Mall;

    Stanford University, Stanford, California 94305,Department of Mechanical Engineering, 452 Escondido Mall;

    Stanford University, Stanford, California 94305,Department of Mechanical Engineering, 452 Escondido Mall;

    Stanford University, Stanford, California 94305,Department of Mechanical Engineering, 452 Escondido Mall;

    University of Virginia, Charlottesville, Virginia 22904,Department of Mechanical and Aerospace Engineering, 570 Edgemont Road;

    University of Virginia, Charlottesville, Virginia 22904,Department of Mechanical and Aerospace Engineering, 570 Edgemont Road;

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