Flame structure and laminar burning speed of gas to liquid fuel air mixtures at moderate pressures and high temperatures

Wang, Ziyu; Alswat, Mohammed; Yu, Guangying; Al-lehaibi, Moaz; Metghalchi, Hameed

doi:10.1016/j.fuel.2017.08.009

Cited by 35 publications

(7 citation statements)

References 55 publications

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“…Metghalchi and co-workers − improved the laminar burning speed calculation using measured pressure rise in a constant volume vessel. They developed a multishell thermodynamic model and later modified it by considering effects of the thermal boundary layer, preheat zone, burned gas temperature gradient, and conductive and radiative energy losses.…”

Section: Experimental Methodologiesmentioning

confidence: 99%

Effects of Carbon Dioxide on Laminar Burning Speed and Flame Instability of Methane/Air and Propane/Air Mixtures: A Literature Review

Wang

Yelishala

et al. 2019

Energy Fuels

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This work reviews the impact of carbon dioxide (CO 2 ) on laminar burning speed and stability of the flame for methane (CH 4 ) and propane (C 3 H 8 ) combustion with air. Mixtures of CH 4 and CO 2 , also known as biogas, are considered as low-cost alternative fuels. Biogas is widely used in various industrial and residential applications. Mixtures of C 3 H 8 and CO 2 are considered as alternative refrigerants with low global warming potential and low flammability. Laminar burning speeds were reported using different experimental methods. Laminar burning speeds have also been numerically calculated by onedimensional steady code using three chemical kinetic mechanisms. Results depict a decrease in equilibrium flame temperature and laminar burning speed of both CH 4 /air and C 3 H 8 /air mixtures with the existence of CO 2 in those mixtures. The maximum laminar burning speeds of neat CH 4 and C 3 H 8 are observed to be in the vicinity of an equivalence ratio of 1.1; however, as the percentage of CO 2 increases, the maximum laminar burning speeds shift toward stoichiometric mixtures. Carbon dioxide also increases flame thickness and suppresses flame instability by the combination of thermal-diffusive and hydrodynamic effects.

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Section: Experimental Methodologiesmentioning

confidence: 99%

Effects of Carbon Dioxide on Laminar Burning Speed and Flame Instability of Methane/Air and Propane/Air Mixtures: A Literature Review

Wang

Yelishala

et al. 2019

Energy Fuels

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“…The unburned gas temperature range of methane-air mixture is calculated with an assumption of an isentropic process, using the Equation 3. The indices 1 and 2 represent the primary and secondary thermodynamic states, respectively [35].…”

Section: Lean Flammability Limitmentioning

confidence: 99%

Investigation of the Effect of Electrode Surface Roughness on Spark Ignition

Morovatiyan

Shahsavan

Shen

et al. 2018

Volume 1: Large Bore Engines; Fuels; Advanced Combustion

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Lean-burn engines are important due to their ability to reduce emissions, increase fuel efficiency, and mitigate engine knock. In this study, the surface roughness of spark plug electrodes is investigated as a potential avenue to extend the lean flammability limit of natural gas. A nano-/micro-morphology modification is applied on surface of the spark plug electrode to increase its surface roughness. High-speed Z-type Schlieren visualization is used to investigate the effect of the electrode surface roughness on the spark ignition process in a premixed methane-air charge at different lean equivalence ratios. In order to observe the onset of ignition and flame kernel behavior, experiments were conducted in an optically accessible constant volume combustion chamber at ambient pressures and temperatures. The results indicate that the lean flammability limit of spark-ignited methane can be lowered by modulating the surface roughness of the spark plug electrode.

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“…[5,6] The fuel spray and atomization characteristics are the main factors affecting the combustion and emission performances of internal combustion engines. [7] Good dispersion atomization can affect the fuel distribution in the burner to a certain extent, thereby improving the ignition, [8] combustion, [9] and emission characteristics [10,11] of the fuel. Moreover, the formation of fuel-air mixture, which is an important factor in controlling the combustion rate to reduce emissions, is influenced by the fuel atomization characteristics.…”

Section: Introductionmentioning

confidence: 99%

Dynamic evolution of low-viscosity fuel particle distribution driven by constant flow

Yang

et al. 2023

Chinese Phys. B

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In a constant-volume chamber, the atomization characteristics of low-viscosity fuel sprays were studied under the effects of mass concentration and injection pressure. Microscopic spray parameters were measured via laser diffraction downstream of the nozzle at various axial and radial positions. The results showed that an increase in the mass concentration suppressed the atomization effect in a linear manner. The increase in injection pressure promoted droplet breakup; however, the trend gradually weakened and became more noticeable at high concentrations. Compared to the concentration, the influence of the injection pressure on the atomization characteristics was dominant. Although low concentration and high injection pressure promoted droplet breakup, they also increased the probability of droplet collision, resulting in droplet aggregation. This was more evident in low-viscosity fuels. The droplet size increased in the axial direction owing to the aggregation. However, the diameter decreased in the radial direction owing to the outward deflection of small droplets caused by air turbulence and entrainment. In addition, the high-velocity airflow significantly promoted droplet breakup near the nozzle and spray axis regions and suppressed the aggregation effect. Nevertheless, lower-viscosity fuels maintained smaller droplet sizes and better atomization throughout the spraying process, which was easier to achieve than that in higher-viscosity fuels. Overall, low concentration, high injection pressure and low viscosity of the fuel have beneficial effects on the droplet breakup. This is important to enhance the atomization effect of the fuel.

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Flame structure and laminar burning speed of gas to liquid fuel air mixtures at moderate pressures and high temperatures

Cited by 35 publications

References 55 publications

Effects of Carbon Dioxide on Laminar Burning Speed and Flame Instability of Methane/Air and Propane/Air Mixtures: A Literature Review

Effects of Carbon Dioxide on Laminar Burning Speed and Flame Instability of Methane/Air and Propane/Air Mixtures: A Literature Review

Investigation of the Effect of Electrode Surface Roughness on Spark Ignition

Dynamic evolution of low-viscosity fuel particle distribution driven by constant flow

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