Effects of oxygen enrichment on laminar burning velocities and Markstein lengths of CH4/O2/N2 flames at elevated pressures

Cai, Xiao; Wang, Jinhua; Zhang, Weijie; Xie, Yongliang; Zhang, Meng; Huang, Zuohua

doi:10.1016/j.fuel.2016.07.011

Cited by 61 publications

(10 citation statements)

References 35 publications

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“…To further improve the accuracy of the simulated values, Figure 3b shows the deviation of uL measured by different groups from that predicted by the simulation based on GRI_mech 3.0. The results show that the difference in uL between the simulated data (0.3 MPa and 323 K) and HASSAN's [32] and Halter's [9] (0.3 MPa and 298 K) is found to be within 4.7 cm/s at a temperature difference of 25 K. Good agreement is found between our data and Cai's [33] measurements except for the Φ of 0.7, where our uL is 2.9 cm/s (error 9%) higher, as the temperature difference is 5 K. The deviation in numerical data is only slightly larger than that of Hinton's [34], especially when the equivalent is relatively high, but the maximum difference is only 5 cm/s. It can be seen that the simulation model maintains good consistency with the experimental results and literature data and can be used for analysis under certain working conditions.…”

Section: Chemical Kinetic Modelsupporting

confidence: 78%

The Equivalent Effect of Initial Condition Coupling on the Laminar Burning Velocity of Natural Gas Diluted by CO2

Wang

Zhu

et al. 2021

Energies

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Initial temperature has a promoting effect on laminar burning velocity, while initial pressure and dilution rate have an inhibitory effect on laminar burning velocity. Equal laminar burning velocities can be obtained by initial condition coupling with different temperatures, pressures and dilution rates. This paper analysed the equivalent distribution pattern of laminar burning velocity and the variation pattern of an equal weight curve using the coupling effect of the initial pressure (0.1–0.3 MPa), initial temperature (323–423 K) and dilution rate (0–16%). The results show that, as the initial temperature increases, the initial pressure decreases and the dilution rate decreases, the rate of change in laminar burning velocity increases. The equivalent effect of initial condition coupling can obtain equal laminar burning velocity with an dilution rate increase (or decrease) of 2% and an initial temperature increase (or decrease) of 29 K. Moreover, the increase in equivalence ratio leads to the rate of change in laminar burning velocity first increasing and then decreasing, while the increases in dilution rate and initial pressure make the rate of change in laminar burning velocity gradually decrease and the increase in initial temperature makes the rate of change in laminar burning velocity gradually increase. The area of the region, where the initial temperature influence weight is larger, gradually decreases as the dilution rate increases, and the rate of decrease gradually decreases.

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Section: Chemical Kinetic Modelsupporting

confidence: 78%

The Equivalent Effect of Initial Condition Coupling on the Laminar Burning Velocity of Natural Gas Diluted by CO2

Wang

Zhu

et al. 2021

Energies

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“…The USC 2.0 29 mechanism includes 111 substances and 784 basic chemical reactions, which contains detailed sub mechanisms such as the H 2 or CO and C 1 –C 4 dynamical models. San Diego‐Mech 30 is suitable for combustion flame under high temperature ignition and explosion conditions. The model has perfect performance in simulating small hydrocarbons with only 50 compounds and 247 elements.…”

Section: Validation Of Chemical Mechanismmentioning

confidence: 99%

Numerical study on the effects of CO₂/H₂O dilution on the ignition delay time of methane

Shen

Xie

et al. 2022

Int J of Chemical Kinetics

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In this study, the effects of CO2/H2O dilution on the ignition delay time (IDT) of methane under different conditions were studied by the method of sensitivity analysis, mole fraction analysis and reaction path analysis. The predictions of six published kinetic models were first compared with experimental data from the literature; the kinetics of the model judged best were then analyzed in greater detail to investigate coupling effects of different ratios of CO2/H2O dilution, temperature, pressure, and equivalence ratios on the IDT of methane. Through this research, it was found that under high temperature conditions (1700–2000 K), the IDT increases with CO2/H2O ratios increasing. At the equivalence ratio of 2.0 and low to medium temperatures (1000–1700 K), the diluent gas at the ratio of CO2/H2O = 0.4/0.6 has the maximum suppression effect on methane ignition, and the inhibitory effect of diluted gas in the IDT can be enhanced by 4.9% compared with other cases. Through the path analysis, it was found that the reaction path under the condition of CO2/H2O = 0.4/0.6 is changed into the O radicals generation reactions and CH3 consuming Reactions (R155, R106, and R158) comparing with the condition of CO2/H2O = 0.8/0.2. By providing insight into the factors affecting the IDT of methane under a wide variety of conditions, the present study extends our understanding of methane combustion and can be used to guide the development of a combined application of EGR and in‐cylinder water injection.

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“…Flame radiation, which will also inherently influence the extraction of unstretched flame propagation speed, is another factor that should be taken into account. Yu et al [26] proposed the following implicit expression to evaluate the effect of flame radiation…”

Section: Schlieren Photographingmentioning

confidence: 99%

Laminar flame characteristics of natural gas and dissociated methanol mixtures diluted by nitrogen

Zhu

Liang

Zeng

et al. 2020

Journal of the Energy Institute

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Effects of oxygen enrichment on laminar burning velocities and Markstein lengths of CH4/O2/N2 flames at elevated pressures

Cited by 61 publications

References 35 publications

The Equivalent Effect of Initial Condition Coupling on the Laminar Burning Velocity of Natural Gas Diluted by CO2

The Equivalent Effect of Initial Condition Coupling on the Laminar Burning Velocity of Natural Gas Diluted by CO2

Numerical study on the effects of CO₂/H₂O dilution on the ignition delay time of methane

Laminar flame characteristics of natural gas and dissociated methanol mixtures diluted by nitrogen

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Effects of oxygen enrichment on laminar burning velocities and Markstein lengths of CH4/O2/N2 flames at elevated pressures

Cited by 61 publications

References 35 publications

The Equivalent Effect of Initial Condition Coupling on the Laminar Burning Velocity of Natural Gas Diluted by CO2

The Equivalent Effect of Initial Condition Coupling on the Laminar Burning Velocity of Natural Gas Diluted by CO2

Numerical study on the effects of CO2/H2O dilution on the ignition delay time of methane

Laminar flame characteristics of natural gas and dissociated methanol mixtures diluted by nitrogen

Contact Info

Product

Resources

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Numerical study on the effects of CO₂/H₂O dilution on the ignition delay time of methane