Topology of turbulent premixed and stratified LPG/air flames

Sellan, Dhanalakshmi; Balusamy, Saravanan

doi:10.1016/j.ast.2021.107253

Cited by 2 publications

(1 citation statement)

References 55 publications

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“…The developed calibration curves of C 2 */CH* vs. Φ can then be used to track local or transient flame dynamics, such as heat release-rate fluctuations or lean blowout [ 28 , 29 ]. OH* and CH* are also commonly used pairs of radical species for chemiluminescence imaging [ 16 , 25 , 30 , 31 , 32 , 33 ]. Chemiluminescence intensity ratios have been used to examine local variations in the species’ intensities and how they relate to the flame structure [ 15 , 16 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Four-Line C2/CH Optical Sensor for Chemiluminescence Based Imaging of Flame Stoichiometry

Tonarely

Genova

Morales

et al. 2022

Sensors

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In the present work, an optical sensor was developed and calibrated for the purpose of non-intrusive equivalence ratio measurements in combustion systems. The sensor incorporates a unique four-line, single-sensor chemiluminescence imaging-based approach, which relies on the ratio of C2* and CH* radical-species intensities to obtain measurements of equivalence ratios. The advantage of the four-line sensor is the use of additional filtering to mitigate broadband luminescence signals, and its improvements over conventional two-line chemiluminescence diagnostics are discussed. The sensor was calibrated using a premixed bluff-body jet burner with a propane–air flame operating over a wide range of equivalence ratios. The results showed that the four-line processing technique improved the signal-to-noise ratio of the chemiluminescence images for all test cases. Calibrations of C2*/CH* intensity ratio to equivalence ratio were developed for both the four-line and two-line techniques. The calibrations were then used to create maps of local equivalence ratios in the flame-holding region. The maps revealed a non-uniform field of equivalence ratios due to the nature of the radical-species intensity profiles within the flame. Therefore, special consideration is required for calibration in order to accurately quantify equivalence ratios and apply these to diffusion flames.

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Section: Introductionmentioning

confidence: 99%

Four-Line C2/CH Optical Sensor for Chemiluminescence Based Imaging of Flame Stoichiometry

Tonarely

Genova

Morales

et al. 2022

Sensors

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Large eddy simulations of pilot-stage equivalence ratio effects on combustion instabilities in a coaxial staged model combustor

Lv,

Liu,

Zhang

et al. 2023

Physics of Fluids

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In this paper, the effects of pilot-stage equivalence ratio on combustion instabilities in a coaxial staged model combustor are investigated using the Wall-Modeled Large Eddy Simulation. The global equivalence ratio is maintained constant, and the Stratification Ratio of the first main-stage and the second main-stage is set to 1; the dynamic mode decomposition and system identification methods are employed to analyze the flame dynamics, velocity, heat release rate modes, and flame transfer function (FTF) of the model combustor under different pilot-stage equivalence ratios. The results show that when the pilot-stage equivalence ratio is 0.6, the oscillation amplitude of heat release rate (HRR) exceeds 7.5% of the global average HRR, and the velocity oscillation and the global HRR oscillation in the combustor are coupled. As the pilot-stage equivalence ratio increases to 0.8, the oscillation amplitude of HRR decreases to 2.5%, and the oscillation of velocity and global HRR in the combustor are decoupled. Furthermore, the maximum value of FTF decreases from 3.5 to below 1 with the increase in the pilot-stage equivalence ratio.

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Topology of turbulent premixed and stratified LPG/air flames

Cited by 2 publications

References 55 publications

Four-Line C2/CH Optical Sensor for Chemiluminescence Based Imaging of Flame Stoichiometry

Four-Line C2/CH Optical Sensor for Chemiluminescence Based Imaging of Flame Stoichiometry

Large eddy simulations of pilot-stage equivalence ratio effects on combustion instabilities in a coaxial staged model combustor

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Topology of turbulent premixed and stratified LPG/air flames

Cited by 2 publications

References 55 publications

Four-Line C2*/CH* Optical Sensor for Chemiluminescence Based Imaging of Flame Stoichiometry

Four-Line C2*/CH* Optical Sensor for Chemiluminescence Based Imaging of Flame Stoichiometry

Large eddy simulations of pilot-stage equivalence ratio effects on combustion instabilities in a coaxial staged model combustor

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Product

Resources

About

Four-Line C2/CH Optical Sensor for Chemiluminescence Based Imaging of Flame Stoichiometry

Four-Line C2/CH Optical Sensor for Chemiluminescence Based Imaging of Flame Stoichiometry