Laser diagnostic techniques play an important role in combustion research. Four laser-based measurement techniques are developed for harsh combustion environments. In the measurements of aeroengine turbine combustor, two dimension temperature distribution of a interior cross-section was obtained by self-designed 2D-scan coherent anti-stokes Raman scattering (CARS) system, and the main species concentration in the region above the primary hole were measured by spontaneous vibration Raman scattering (SVRS). In the investigations of a supersonic combustor, the line-of-sight averaged temperature was on-line acquired by tunable diode laser absorption spectroscopy (TDLAS) technique, and the velocity components near the exit of combustor were obtained by single line hydroxyl tagging velocimetry (HTV). These measurement activities demonstrate that laser diagnostic techniques have well performance in harsh environments, such as unclean combustion, strong vibration and high background emission. These diagnostic techniques can provide useful experimental data for validating computational fluid dynamics (CFD) model and evaluating combustor characteristics.
Laser diagnostic techniques play an important role in combustion research. Four laser-based measurement techniques are developed for harsh combustion environments. In the measurements of aeroengine turbine combustor, two dimension temperature distribution of a interior cross-section was obtained by self-designed 2D-scan coherent anti-stokes Raman scattering (CARS) system, and the main species concentration in the region above the primary hole were measured by spontaneous vibration Raman scattering (SVRS). In the investigations of a supersonic combustor, the line-of-sight averaged temperature was on-line acquired by tunable diode laser absorption spectroscopy (TDLAS) technique, and the velocity components near the exit of combustor were obtained by single line hydroxyl tagging velocimetry (HTV). These measurement activities demonstrate that laser diagnostic techniques have well performance in harsh environments, such as unclean combustion, strong vibration and high background emission. These diagnostic techniques can provide useful experimental data for validating computational fluid dynamics (CFD) model and evaluating combustor characteristics.
A mobile diagnostic system based on Unstable-resonator Spatially Enhanced Detection Coherent anti-Stokes Raman
Scattering (USED CARS) geometry was established, which was used for temperature measurements in a model
supersonic combustor. The temporal and spatial resolution of this mobile CARS system are 10ns and Ф0.1mm×5mm
respectively. Single pulse nitrogen CARS spectrum with high signal to noise ratio(SNR) were obtained at the exhaust of
model combustor through high stability optical design, and the temperatures were acquired by Levenberg-Marquarat
fitting algorithm. The mean temperature of the unstable combustion is 1412K, and the mean temperature of the stable
combustion is 1705K.
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