Flashback of H2-enriched premixed flames in perforated burners: Numerical prediction of critical velocity

Fruzza, Filippo; Lamioni, Rachele; Tognotti, Leonardo; Galletti, Chiara

doi:10.1016/j.ijhydene.2023.04.252

Cited by 15 publications

(8 citation statements)

References 49 publications

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“…The flame moves along the channel, burning the reactants in a zone increasingly downstream until it "blows off" (possibly self-extinguishing) when the fuel flow rate exceeds a certain limit. The research paper by Fruzza et al [44] studies the flashback of different H 2 /CH 4 mixtures and uses 2D unsteady simulations with detailed kinetics and considers the fundamental role of the combustor wall by considering the Conjugate Heat Transfer. Different flashback regimes were studied for different H 2 contents which highlights the significant difference between the critical flashback velocity and laminar flame speed at high H 2 contents.…”

Section: Flashback and Blow-offmentioning

confidence: 99%

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

Dias,

Resende,

Afonso

2024

Energies

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This work presents a state-of-the-art review of micro-combustion flame dynamics and micro propulsion systems. In the initial section, we focus in on the different challenges of micro-combustion, investigating the typical length and time scales involved in micro-combustion and some critical phenomena such as flammability limits and the quenching diameter.We present an extensive collection of studies on the principal types of micro-flame dynamics, including flashback, blow-off, steady versus non-steady flames, mild combustion, stable flames, flames with repetitive extinction, and ignition and pulsatory flame burst. In the final part of this review, we focus on micropropulsion systems, their performance metrics, conventional manufacturing methods, and the advancements in Micro-Electro-Mechanical Systems manufacturing.

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Section: Flashback and Blow-offmentioning

confidence: 99%

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

Dias,

Resende,

Afonso

2024

Energies

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“…Compared with traditional combustion technology, porous media combustion technology has the advantages of a compact structure, better combustion stability, higher combustion efficiency, and lower pollutant emission. − Kıymaz et al investigated the effects of different wall temperatures and hydrogen blending ratios on the phenomenon of hydrogen-enriched natural gas flashback. Fruzza et al found that the occurrence of flashback in hydrogen-enriched natural gas is closely related to the flame and burner structure. Arrieta et al studied the effects of mixtures with different hydrogen doping ratios and equivalent ratios on temperature distribution, radiation efficiency, and pollutant emissions in porous media burners.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Combustion Characteristics and Environmental Effects of Hydrogen-doped Natural Gas for Domestic Water Heaters

Chen,

Long,

Niu

et al. 2023

ACS Omega

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The addition of hydrogen to natural gas is an effective approach to broaden the range of applications for hydrogen and address the issue of global warming. However, the inclusion of hydrogen alters the combustion properties of natural gas. The paper established a simplified mechanism consisting of 19 components and a 67-step reaction for hydrogen-doped natural gas combustion. With this simplified mechanism, the effects of hydrogen doping and the utilization of porous media combustion techniques on the combustion characteristics of natural gas were investigated numerically. The results suggested that the utilization of porous media combustion technology is beneficial for achieving the complete combustion of hydrogen-doped natural gas and reducing pollutant emissions. Additionally, the total gas cost and environmental impact of domestic gas water heaters with hydrogen-doping natural gas were estimated. The findings show that the use of 20% hydrogen-doped natural gas contributes to a decrement in fuel costs and reduced emissions of CO by 25.4%, NO X by 53.9%, and CO 2 by 6.78%.

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“…In the homogeneous porous medium material, flame stabilization is most commonly attained when the flame speed matches the upstream flow velocity of the air and fuel mixture, but this condition is usually difficult to achieve. More often, the flame will move within the burner, which will lead to a potential risk of blow-out or flashback [14]. The two-layer porous media burner is an ingenious design.…”

Section: Introductionmentioning

confidence: 99%

Study on Oxy-Methane Flame Stability in a Cylindrical Porous Medium Burner

et al. 2023

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Combustion in a porous medium can be beneficial for enhancing reaction rate and temperature uniformity. Therefore, considering the combination with oxy-fuel combustion can address some shortcomings in oxy-fuel burners, a cylindrical two-layer porous burner model is established based on OpenFOAM in this paper. A two-temperature equation model is adopted for the simulation of the heat transfer process. The CH4 skeletal kinetic mechanism is adopted for complex chemistry integration based on OpenSMOKE++. Corresponding experimental methods were used for complementary studies. The walls of the burner are wrapped with three types of thermal insulation materials to present different levels of heat loss. The results show that considering the convection and radiative heat loss of the burner wall, the temperature near the wall is reduced by more than 300 K compared to the adiabatic condition. As a result, the flame propagation speed and CO oxidation rate slowed down. The stable range will be destructively narrowed by more than 50%, and CO emissions will increase by more than 10 times. These defects will be aggravated by increasing the diameter of the burner. It is observed that when the diameter of the burner increases from the initial 5 cm to 10 cm, the effect of heat loss on the stable range is insignificant.

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Flashback of H2-enriched premixed flames in perforated burners: Numerical prediction of critical velocity

Cited by 15 publications

References 49 publications

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

Investigation on the Combustion Characteristics and Environmental Effects of Hydrogen-doped Natural Gas for Domestic Water Heaters

Study on Oxy-Methane Flame Stability in a Cylindrical Porous Medium Burner

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