Effect of Cavity Coupling Factors of Opposed Counter-Flow Microcombustor on the Methane-Fueled Catalytic Combustion Characteristics

Yan, Yunfei; Liu, Ying; Li, Haojie; Huang, Weipeng; Chen, Yanrong; Li, Lixian; Yang, Zhongqing

doi:10.1115/1.4041405

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…To be specific, current cutting-edge batteries have an energy density of 0.05~0.265 kWh/kg, which is ~1/60th (for the upper energy density limit) of that of typical hydrocarbon fuel, such as methane (CH 4 ) [1,5]. Many physical and chemical processes impact micro-combustion systems; topics such as gas-phase phenomena, surface reactions, species transport, and thermal properties of the combustor material, as well as thermal and mass diffusion, convection, and radiation can all have a dramatic impact on a specific application [1,[5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Ignition and Stability Limits of Premixed Methane/Air Combustion in Micro-Channels

Kutkut,

Ayoobi,

Baumgardner

et al. 2023

Energies

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Understanding and improving the performance of miniature devices powered by micro-combustion have been the focus of continued attention of researchers recently. The goal of the present work is to investigate the behavior of premixed methane–air combustion in a quartz microreactor with an externally controlled wall temperature. Specifically, the impacts of the flow inlet velocity, the equivalence ratio, and the microreactor channel size are examined. This study is conducted by means of computational simulations, and the results are validated against prior experimental data, as well as by other similar studies in the literature. Utilizing simulation results with detailed chemistry, the present work provides more in-depth insight into a variety of phenomena, such as ignition, flame propagation, flames with repetitive extinctions and ignitions (FREI), and flame stabilization. In particular, the ignition, the flame span, and the FREI-related characteristics are scrutinized to understand the underlying physics of the flame stability/instability modes. It is shown that the flames appear stable at higher inlet velocities, while the FREI mode is detected at a lower inlet velocity, depending on the equivalence ratio and the channel size. The findings also explain how different operating conditions impact the flame characteristics in both stability modes.

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Section: Introductionmentioning

confidence: 99%

Investigating the Ignition and Stability Limits of Premixed Methane/Air Combustion in Micro-Channels

Kutkut,

Ayoobi,

Baumgardner

et al. 2023

Energies

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“…Typical hydrocarbon fuels have an energy density around 100 times that of the most modern batteries. Despite the heat losses associated with harvesting energy from fuel combustion, a microscale combustion system has been deemed a potential alternative to batteries [1][2][3][4][5]. Understanding the mechanics of laminar micro-fames is critical for developing such combustion devices because multiple micro-fames may be utilized concurrently to improve a heat source's overall heating efectiveness [6].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Combustion and Flame Characteristics of Laminar Methane/Air and N-Butane/Air Flames in a Micro-Slot Burner

Sheykhbaglou

Robati

2022

International Journal of Chemical Engineering

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Combustion and flame characteristics of laminar methane/air and n-butane/air flames in a 3D-printed micro-slot burner is compared and reported in this study. The stability limit, flame appearance, and emission performance are investigated experimentally. In addition, past research on conventional burners is compared with the results of this study throughout the paper. The construction of this micro-slot burner was met by selective laser melting (SLM) process. Flame characteristics such as lift-off height, length, visible area, maximum width, and neck width are obtained using an image processing algorithm and are examined at different fuel and airflow rates. The results show that the blow-out limits of methane/air and n-butane/air flames are almost the same when compared at the same volume flow rates, although the methane/air flames are more stable than n-butane/air flames at the same thermal input powers. A region of interesting rope-like oscillatory flames (that has never been seen before in conventional burners) is observed in a small portion of a stable region for n-butane with a period ranging from 75.0 to 210.0 m s . It is also observed that the fuel type and fuel and airflow rates affect the flame shape and appearance and the flames formed by heavier fuel (n-butane) have longer length, lift-off height, maximum width, and visible area and lower neck width. Furthermore, methane/air flames exhibit lower values of C O and higher values of N O x in the flue gas when compared to n-butane/air flames.

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Numerical Investigation of Auto-Ignition Characteristics in Microstructured Catalytic Honeycomb Reactor for CH4–Air and CH4–H2–Air Mixtures

Kayed

Mohamed

Yehia

et al. 2019

Journal of Energy Resources Technology

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Stable ranges of auto-ignition for the microcombustion of CH4 and CH4–H2 mixtures are identified numerically in a platinum-coated microcatalytic honeycomb reactor. Steady and transient simulations under pseudo-auto-thermal conditions were performed to investigate the coupling phenomenon between combustion and heat transfer in such microburner using ANSYS 17.2 coupled with a detailed chemkin reaction mechanism. The model was validated utilizing the available data in the literature on a similar microreactor, and the results showed good agreements. A certain amount of heat is furnished from outside at constant temperature from an external electric furnace to investigate the variations of localized self-ignition temperature while changing the flow rate and mixture strength. It was found that the ignition temperature for CH4–air mixtures is not affected by the mass flow rate. However, the ignition temperature of CH4–H2 air mixtures decreases while increasing the flow rate. The effect of equivalence ratio was studied to demonstrate the variations of flammability limits of the present microreactor. The equivalence ratio required for auto-ignition of CH4–air mixtures was found to be in the range from 0.4 up to 0.85 at a flow rate of 9.5 g/s. The reaction front moved from upstream to downstream under transient conditions matching with the reported experimental behavior in the literature.

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Effect of Cavity Coupling Factors of Opposed Counter-Flow Microcombustor on the Methane-Fueled Catalytic Combustion Characteristics

Cited by 5 publications

References 19 publications

Investigating the Ignition and Stability Limits of Premixed Methane/Air Combustion in Micro-Channels

Investigating the Ignition and Stability Limits of Premixed Methane/Air Combustion in Micro-Channels

Comparative Study on Combustion and Flame Characteristics of Laminar Methane/Air and N-Butane/Air Flames in a Micro-Slot Burner

Numerical Investigation of Auto-Ignition Characteristics in Microstructured Catalytic Honeycomb Reactor for CH4–Air and CH4–H2–Air Mixtures

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