Measurement of Fuel Concentration Distribution in a Sooting Flame through Raman Scattering

Hayashida, Kazuhiro; Amagai, Kenji; Satoh, Keiji; Arai, Masataka

doi:10.1299/jsmeb.49.512

Cited by 4 publications

(3 citation statements)

References 22 publications

(23 reference statements)

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“…Data collection was done with DAVIS Flowmaster 7.1.1 (Lavision, Göttingen, Germany) and 50 images with 30 bursts per image were taken at each measurement position with the Nanostar camera for two different polarization directions of the laser beam. Before data evaluation was done, the background emissions were subtracted to obtain more reliable results [18,19].…”

Section: Raman Scatteringmentioning

confidence: 99%

Frequency-resolved interferometric measurement of local density fluctuations for turbulent combustion analysis

Köberl

Fontaneto

Giuliani

et al. 2010

Meas. Sci. Technol.

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A validation of a novel interferometric measurement technique for the frequency-resolved detection of local density fluctuation in turbulent combustion analysis was performed in this work. Two laser vibrometer systems together with a signal analyser were used to obtain frequency spectra of density fluctuations across a methane-jet flame. Since laser vibrometry is based on interferometric techniques, the derived signals are path-integrals along the measurement beam. To obtain local frequency spectra of density fluctuations, long-time-averaged measurements from each of the two systems were performed using correlation functions and cross spectra. Results were compared to data recorded by standard interferometric techniques for validation purposes. Additionally, Raman scattering and laser Doppler velocimetry were used for flame characterization.

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Section: Raman Scatteringmentioning

confidence: 99%

Frequency-resolved interferometric measurement of local density fluctuations for turbulent combustion analysis

Köberl

Fontaneto

Giuliani

et al. 2010

Meas. Sci. Technol.

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“…Considering that LIF and LII signals are depolarized [10], clean RS signals can be obtained by subtracting signals from different polarization directions. The RS signals with different polarization directions can be excited by two sequential superimposed laser beams with different polarization directions [11,12] or captured by two imaging systems for signals with different polarization directions [8,9,[13][14][15]. Nevertheless, this strategy has some limitations considering that (1) the LIF/LII signals are not 100% depolarized, indicating some remaining LIF/LII signals still exist after processing the collected RS signals; (2) the data processing needs two measurements to get clean RS signal.…”

Section: Introductionmentioning

confidence: 99%

In-situ temperature and major species measurements of sooting flames based on short-gated spontaneous Raman scattering

et al. 2023

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Spontaneous Raman scattering is a conventional in-situ laser-diagnostic method that has been widely used for measurements of temperature and major species. However, utilization of Raman scattering in sooting flames suffers from strong interference including laser-induced fluorescence, laser-induced incandescence, and flame luminosity, which has been a challenge for a long time. This work introduces an easy-to-implement and calibration-free Raman scattering thermometry in sooting flames based on a 355-nm nanosecond-pulsed laser beam. Several strategies were utilized to increase the signal-to-noise ratio and suppress the interference: (1) nanosecond intensified CCD gate width; (2) optimized intensified CCD gate delay; (3) specially designed focused laser beam; (4) ultraviolet polarizer filter. The temperature was obtained by fitting the spectral profile of Stokes-Raman scattering of N2 molecules without any calibrations. Based on the measured temperature, the mole fraction of major species can be evaluated. This method was applied to measure the temperature and major species profiles in a steady ethylene–air counterflow diffusion flame with a spatial resolution of 1.2 mm × 10.8 mm × 0.13 mm. The experimental results agree well with the simulation results in both sooting and non-sooting regions, demonstrating the feasibility of this method for quantitative diagnostics of temperature and major species in multiphase reacting flows.

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“…Considering that the LIF and LII signals are depolarized due to the collision between molecules in the emission process [8], the clean Raman scattering signal can be obtained by two sequential superimposed laser beams with different polarizations [9,10] or using two imaging systems with a polarization filter with different directions [6,7,[11][12][13]. Nevertheless, this technique has limitations because the LIF/LII signals are not 100% depolarized, which means some LIF/LII signals remain in the processed Raman signal.…”

Section: Introductionmentioning

confidence: 99%

In-situ temperature and major species measurements of sooting flames based on short-gated spontaneous Raman scattering

Meng¹,

Ren²,

Pitsch³

2022

Preprint

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Spontaneous Raman scattering is a conventional in-situ laser-diagnostic method that has been widely used for measurements of temperature and major species. However, utilization of Raman scattering in sooting flames suffers from strong interference including laser-induced fluorescence, laser-induced incandescence, and flame luminosity, which has been a challenge for a long time. This work introduces an easy-to-implement and calibration-free Raman scattering thermometry in sooting flames based on a 355-nm nanosecond pulsed laser beam. Several strategies were utilized to increase the signal-to-noise ratio and suppress the interference: (1) nanosecond intensified CCD gate width; (2) optimized intensified CCD gate delay; (3) specially designed focused laser beam; (4) ultraviolet polarizer filter. The temperature was obtained by fitting the spectral profile of Stokes Raman scattering of N2 molecules, which does not require additional calibration. Based on the measured temperature, the mole fraction of major species can be further evaluated. As a demonstration, this method was applied to measure the temperature and major species profiles in a steady ethylene-air counterflow diffusion flame. The experimental results agree well with the simulation results in both sooting and non-sooting regions, demonstrating the feasibility of this method for quantitative diagnostics of temperature and major species in multiphase reacting flows.

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Measurement of Fuel Concentration Distribution in a Sooting Flame through Raman Scattering

Cited by 4 publications

References 22 publications

Frequency-resolved interferometric measurement of local density fluctuations for turbulent combustion analysis

Frequency-resolved interferometric measurement of local density fluctuations for turbulent combustion analysis

In-situ temperature and major species measurements of sooting flames based on short-gated spontaneous Raman scattering

In-situ temperature and major species measurements of sooting flames based on short-gated spontaneous Raman scattering

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