Dilution effect of different combustion residuals on laminar burning velocities and burned gas Markstein lengths of premixed methane/air mixtures at elevated temperature

Duva, Berk Can; Chance, Lauren Elizabeth; Toulson, Elisa

doi:10.1016/j.fuel.2020.117153

Cited by 28 publications

(11 citation statements)

References 32 publications

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“…Mechanism validation was necessary to ensure that the predicted values by numerical model settings and the mechanism used in this study agreed well with the experimental data. Three kinetic mechanisms, including the San Diego mechanism, 25 GRI Mech 3.0 mechanism, 26 and DTU mechanism, 27 were used to calculate laminar burning velocity and compared with the experimental data in the literature. Because there is a rare experiment using H 2 O 2 in the CH 4 /air premixed flame, the numerical model will validate with the CH 4 /air-O 2 enrichment flame experiment of Han et al, 11 Mazas et al, 28 and de Persis et al 29 and the CH 4 /H 2 /air flame experiment of Nilsson et al, 30 Cai et al, 31 Donohue et al, 32 Khan et al, 33 Shang et al 34 and Hu et al 35 to accommodate the two scenarios used in this study.…”

Section: Methodsmentioning

confidence: 99%

Numerical Analysis of Hydrogen Peroxide Addition and Oxygen-Enriched Methane Combustion

2023

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Methane (CH4)/air lean combustion can be enhanced by increasing the concentration of the oxidizer, like oxygen (O2) enrichment, or adding a strong oxidant to the reactant. Hydrogen peroxide (H2O2) is a strong oxidizer that yields O2, steam, and appreciable heat after decomposition. This study numerically investigated and compared the effects of H2O2 and O2-enriched conditions on the adiabatic flame temperature, laminar burning velocity, flame thickness, and heat release rates of CH4/air combustion using the San Diego mechanism. The result showed that in fuel-lean conditions, the adiabatic flame temperature changed from H2O2 addition > O2-enriched scenario to O2-enriched scenario > H2O2 addition with increasing α. This transition temperature was not affected by the equivalence ratio. Adding H2O2 enhanced the laminar burning velocity of the CH4/air lean combustion more than the O2-enriched scenario. The thermal and chemical effects are quantified in various H2O2 additions, and it is found that the chemical effect has a noticeable contribution to the laminar burning velocity compared with the thermal effect, especially in higher H2O2 addition. Further, the laminar burning velocity had a quasi-linear correlation with (OH)max in the flame. The maximum heat release rate was observed at lower temperatures for H2O2 addition and higher temperatures for the O2-enriched scenario. The flame thickness was significantly reduced upon adding H2O2. Finally, the dominant reaction to the heat release rate changed from the reaction of CH3 + O ↔ CH2O + H in the CH4/air or O2-enriched scenario to the reaction of H2O2 + OH ↔ H2O + HO2 in the H2O2 addition scenario.

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Section: Methodsmentioning

confidence: 99%

Numerical Analysis of Hydrogen Peroxide Addition and Oxygen-Enriched Methane Combustion

2023

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“…This method was employed to comprehend the features of flames in small combustion spaces based on their flame propagation qualities, and the results were good when compared to the literature. According to Duva et al [30], the LBV values of CH4/air mixtures diluted with actual combustion residuals are comparable to those of N2 and H2O dilution, but the LBV of CH4 flames diluted with CO2 is much slower. Kochar et al [31] used the Bunsen burner method and the expanding spherical flame method.…”

Section: Laminar Flame Speed and Burning Velocitymentioning

confidence: 97%

“…Duva et al [30] Constant volume bomb The LBV of CH4 flames diluted with CO2 is much slower comparison with N2, H2O.…”

Section: Dong Et Al [27] Stagnation Flow Configurationmentioning

confidence: 99%

Flame Speed and Laminar Burning Velocity in Syngas/Air Mixtures: A Review

Mahdi¹,

Al-Dulaimi²

2022

I2M

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Flame speed and laminar burning velocity (LBV) are important properties of fuel combustion. Both have an impact on how combustion systems are designed and operated. As a result, understanding how LBV and flame speed fluctuate as a function of thermodynamic conditions is critical for understanding the impact of practical applications in all combustion systems. Working pressures and temperatures are far higher than those found in the environment. Several studies on flame speed and LBV have been conducted. This study, however, includes a thorough literature analysis of approaches and procedures used to measure these two parameters, as well as the effects of operational factors for various fuels, with a focus on biofuels, for the sake of review simplicity.

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“…As mentioned previously, in the case of beforehand emissions, the increase in the CO 2 content of the fresh mixture strongly affects the reactivity by modifying the stability limits of the combustors. To investigate the thermodynamics and kinetics effect of such CO 2 enrichment on the flame speed, several experimental and numerical laminar flame investigations have been performed in the literature (Halter et al, 2009;Galmiche et al, 2011;Chan et al, 2015;Chen et al, 2020;Duva et al, 2020;Xie et al, 2020). Xie et al (2020) numerically isolated different contributions that compete for such laminar flame speed (LFS) reduction, showing that CO 2 is far from being inert from the kinetics perspective.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a two-step CH4/air reaction mechanism in a CO2-enriched environment for high-fidelity combustion simulations

Castellani,

Nassini,

Andreini

2023

Front. Mech. Eng.

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In the gas turbine framework, the adoption of carbon capture and storage (CCS) systems coupled with strategies to improve the exhaust CO2 content is a promising technology to abate the carbon footprint of such machines. However, any departure of the oxidant from the air can compromise the accuracy of the conventional models to represent the combustion process. In this work, the effect of the CO2 enrichment of the mixture on an atmospheric premixed swirled flame is investigated by means of large eddy simulation (LES), comparing the numerical predictions with the experimental results. The high-fidelity numerical model features a dedicated global reaction mechanism derived through an in-house optimization procedure presented in this study. The chemical scheme is obtained by optimizing a widely used CH4–air two-step mechanism to improve key flame parameters such as the laminar flame speed and thickness and the resistance of the flame to the stretch with moderate CO2 dilution. The numerical results are analyzed in terms of flame shape, heat losses, and pressure fluctuations, showing a promising agreement with the experimental measurements and demonstrating the capabilities of the numerical model for CO2-diluted combustion.

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Dilution effect of different combustion residuals on laminar burning velocities and burned gas Markstein lengths of premixed methane/air mixtures at elevated temperature

Cited by 28 publications

References 32 publications

Numerical Analysis of Hydrogen Peroxide Addition and Oxygen-Enriched Methane Combustion

Numerical Analysis of Hydrogen Peroxide Addition and Oxygen-Enriched Methane Combustion

Flame Speed and Laminar Burning Velocity in Syngas/Air Mixtures: A Review

Optimization of a two-step CH4/air reaction mechanism in a CO2-enriched environment for high-fidelity combustion simulations

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