UV Raman Scattering Measurements of a Mach 2 Reacting Flow Over a Piloted Cavity

Combustion test diagnosis has always been one of the most important technologies for the development of aerospace engineering. The traditional methods of measurement have been unable to meet the requirements of accurate capture of the flow field in the development process of the aeroengine combustor. Therefore, the development of high-precision measurement and diagnostic techniques to meet the needs of the aeroengine combustor design is imperative. Laser diagnostics techniques developed quickly in the past several years. They are used to measure the parameters of the combustion flow field such as velocity, temperature, and components concentration with high space and time resolution and brought no disturbance. Planar laser-induced fluorescence, coherent anti-Stokes Raman scattering, tunable diode laser absorption spectroscopy, and Raman scattering were introduced systemically in this paper. After analysis of their own advantages and disadvantages, the authors considered validated Raman scattering system and Tunable Diode Laser Absorption Tomography are more suitable for research activities on aeroengine combustion systems.

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“…The research group at Vanderbilt University also used the UV Raman system [29] to measure the species concentration…”

Section: Validation and Application Of Raman Scattering Systemmentioning

confidence: 99%

The Brief Introduction of Different Laser Diagnostics Methods Used in Aeroengine Combustion Research

et al. 2016

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“…Therefore, optical methods have been developed and used in high-speed flows, as they provide qualitative and quantitative measurements without perturbation. In particular, spontaneous Raman scattering [2] and coherent anti-Stokes Raman spectroscopy [3] can provide species concentration and gas temperature/density. Laser-induced breakdown spectroscopy (LIBS) provides an alternate method of measuring species concentrations and gas density.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous gas density and fuel concentration measurements in a supersonic combustor using laser induced breakdown

Carter

Liu

et al. 2015

Proceedings of the Combustion Institute

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"Simultaneous gas density and fuel concentration measurements in a supersonic combustor using laser induced breakdown" (2015 AbstractLaser-induced breakdown is used for quantitative gas property measurements (gas density and ethylene fuel concentration) in a cavity flameholder in a supersonic crossflow. A plasma is produced by a focused laser beam (Nd:YAG, 532 nm) in the cavity to measure gas properties at the location of the plasma and to ignite cavity flames. Plasma energy (PE), defined by the laser pulse energy absorbed/scattered in the plasma, and plasma emission spectra are recorded for estimating gas density and species concentration, respectively. To obtain correlations of PE vs. gas density and emission spectra vs. fuel concentration, calibration experiments are conducted using a variable-pressure (0-900 mbar)/temperature (300-900 K) chamber and a Hencken burner installed in a variable-pressure (50-900 mbar) combustion chamber. Total measurement time is sufficiently short, $80 ns after laser arrival at the plasma region, to capture the high intensity portion of the emission and to minimize effects of plasma displacement (in the high-speed flow). Specifically, the laser pulse energy incident and transmitted (through the plasma) are measured, and the plasma emission spectra are captured during a 50-ns gate, after an approximate 30-ns time delay (relative to onset of emission from the plasma volume) to avoid strong background emission from the plasma.

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The laser measurement technology of combustion flow field

Wang¹,

Wang²,

Qu³

2014

SPIE Proceedings

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UV Raman Scattering Measurements of a Mach 2 Reacting Flow Over a Piloted Cavity

Cited by 5 publications

References 8 publications

The Brief Introduction of Different Laser Diagnostics Methods Used in Aeroengine Combustion Research

The Brief Introduction of Different Laser Diagnostics Methods Used in Aeroengine Combustion Research

Simultaneous gas density and fuel concentration measurements in a supersonic combustor using laser induced breakdown

The laser measurement technology of combustion flow field

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