Quantitative imaging of OH concentrations in a swirling methane jet flame via single-pulse laser-induced predissociative fluorescence

Chao, Yei-Chin; Wu, Der-Chyun; Cheng, T. S.

doi:10.1117/1.602515

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…[1] Measurement of the OH concentration has a great significance for further understanding the chemical reaction mechanism and kinetic model validation. In recent years, a large number of experimental studies and theoretical analyses [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] have been made to accurately determine the OH concentration in a flame by using a variety of laser diagnostic techniques such as coherent anti-Stokes Raman scattering (CARS), degenerate four-wave mixing (DFWM), laser-induced fluorescence (LIF), cavity ring-down spectroscopy (CRDS), and direct absorption spectroscopy. With the exception of LIF, other laser diagnostic techniques can only determine single point or several point OH concentration in flame and hardly give the OH concentration details at different locations.…”

Section: Introductionmentioning

confidence: 99%

Quantitative measurements of one-dimensional OH absolute concentration profiles in a methane/air flat flame by bi-directional laser-induced fluorescence

Yang

Peng

et al. 2015

Chinese Phys. B

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The one-dimensional (1D) spatial distributions of OH absolute concentration in methane/air laminar premixed flat flame under different equivalence ratios at atmospheric pressure are investigated by using bi-directional laser-induced fluorescence (LIF) detection scheme combined with the direct absorption spectroscopy. The effective peak absorption cross section and the average temperature at a height of 2 mm above the burner are obtained by exciting absorption on the Q1(8) rotational line in the A2Σ+ (ʋ′ = 0) ← X2Π (ʋ″ = 0) at 309.240 nm. The measured values are 1.86×10−15 cm2 and 1719 K, respectively. Spatial filtering and frequency filtering methods of reducing noise are used to deal with the experimental data, and the smoothing effects are also compared using the two methods. The spatial distribution regularities of OH concentration are obtained with the equivalence ratios ranging from 0.8 to 1.3. The spatial resolution of the measured result is 84 μm. Finally, a comparison is made between the experimental result of this paper and other relevant study results.

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Section: Introductionmentioning

confidence: 99%

Quantitative measurements of one-dimensional OH absolute concentration profiles in a methane/air flat flame by bi-directional laser-induced fluorescence

Yang

Peng

et al. 2015

Chinese Phys. B

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“…Investigations have taken advantage of laser diagnostic techniques[2， 3] and large-eddy simulations (LES) [4] to understand the chemistry and fluid dynamics of reacting swirling flows. Most of the studies of swirl non-premixed turbulent flames have been performed using burners consisting of a central fuel pipe surrounded by a co-flow of swirling air and a diverging section as quarl [2], a configuration used in industrial burners to improve recirculation and reduce flame length. Other studies of a more fundamental nature used unconfined flames [3], with or without a stabilizing bluff-body, to take advantage of the easier optical access, although the heat release conditions might not be fully representative of a real combustor.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Flow Structure of Non-Premixed Swirl Burner Flows Using PIV

Zang

Guo

2011

AMR

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This paper focuses on investigating the characteristic modes and structures in non-premixed swirling methane/air flames. Using the Particle Image Velocimetry (PIV) technique, the experiment measured the velocity distributions of the swirling flame. Cold flow conditions have been included to provide a picture of the flow field and to demonstrate the modifications induced by combustion. The characteristic lengths, velocity vectors, streamlines, and velocity distributions are presented and discussed. The experiment shows that a large spatial separation at the exit between the central and swirling annular jets can expedite the formation of a recirculation zone. Complex flow structures are found in the recirculation zone. Moreover, the differences between cold swirling flow field and combustion swirling flow are analyzed at length. The data from this experiment is helpful for optimization of the non-premixed burner design, and can be established as benchmarks for the development and validation of combustion numerical simulations.

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Near field flow structure of isothermal swirling flows and reacting non-premixed swirling flames

Olivani

Solero

Cozzi

et al. 2007

Experimental Thermal and Fluid Science

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Quantitative imaging of OH concentrations in a swirling methane jet flame via single-pulse laser-induced predissociative fluorescence

Cited by 3 publications

References 27 publications

Quantitative measurements of one-dimensional OH absolute concentration profiles in a methane/air flat flame by bi-directional laser-induced fluorescence

Quantitative measurements of one-dimensional OH absolute concentration profiles in a methane/air flat flame by bi-directional laser-induced fluorescence

Experimental Study on Flow Structure of Non-Premixed Swirl Burner Flows Using PIV

Near field flow structure of isothermal swirling flows and reacting non-premixed swirling flames

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