Thermoacoustic analysis of lean premixed hydrogen flames in narrow vertical channels

Veiga-López, Fernando; Martínez-Ruiz, Daniel; Кузнецов, М.; Sánchez–Sanz, Mario

doi:10.1016/j.fuel.2020.118212

Cited by 22 publications

(4 citation statements)

References 39 publications

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“…However, small-amplitude flame oscillations are preserved in domains where the channel height h and the flame thickness δ T hold a moderate scale relation h/δ T 10 ( Petchenko et al 2007). This effect, directly related to viscous damping, has been reported for thermoacoustic instabilities of lean hydrogen-air mixtures in Hele-Shaw cells (Veiga-López et al 2020), where thinner channels drastically reduce the acoustic coupling. In turn, small-diameter tubes show the same behaviour in suppressing and extinguishing premixed flames under parametric instabilities (Dubey et al 2021).…”

Section: Introductionmentioning

confidence: 64%

Non-adiabatic modulation of premixed-flame thermoacoustic frequencies in slender tubes

et al. 2022

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This paper presents an experimental study of the influence of heat losses on the onset of thermoacoustic instabilities in methane–air premixed flames propagating in a horizontal tube of diameter, $D = 10$ mm. Flames are ignited at the open end of the tube and propagate towards the closed end undergoing strong oscillations of different features owing to the interaction with acoustic waves. The frequency of oscillation and its axial location are controlled through the tube length $L$ and the intensity of heat losses. These parameters are respectively modified in the experiments by a moveable piston and a circulating thermal bath of water prescribing temperature conditions. Main experimental observations show that classical one-dimensional predictions of the oscillation frequency do not accurately describe the phenomena under non-adiabatic real scenarios. In addition to the experimental measurements, a quasi-one-dimensional analysis of the burnt gases is provided, which introduces the effect of heat losses at the wall of the tube on the interplay between the acoustic field and the reaction sheet. As a result, this analysis provides an improved description of the interaction and accurately predicts the excited flame-oscillation harmonics through the eigenvalues of the non-adiabatic acoustics model. Unlike the original one-dimensional analysis, the comparison between the flame oscillation frequency provided by the non-adiabatic extended theory and the frequencies measured in our experiments is in excellent agreement in the whole range of temperatures considered. This confirms the importance of heat losses in the modulation of the instabilities and the transition between different flame oscillation regimes.

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Section: Introductionmentioning

confidence: 64%

Non-adiabatic modulation of premixed-flame thermoacoustic frequencies in slender tubes

et al. 2022

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“…The influence of the equivalence ratio on the azimuthal instabilities of an annular laboratory-scale burner fueled by methane-hydrogen mixtures was studied by Ahn et al [33]. López et al [34] studied the thermoacoustic instabilities of lean hydrogen-air premixed flames in a quasi-2D geometry, highlighting the importance of the equivalence ratio and the role of channel thickness. Jin Kim et al [35] observed using dynamic pressure sensors and OH planar laser-induced fluorescence (OH PLIF), the multi-mode combustion instabilities in GE7EA combustor fueled by mixture enriched with hydrogen by means of a partial premixed flame that can restrict flashback.…”

Section: Introductionmentioning

confidence: 99%

Thermoacoustic Combustion Stability Analysis of a Bluff Body-Stabilized Burner Fueled by Methane–Air and Hydrogen–Air Mixtures

et al. 2023

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Hydrogen can play a key role in the gradual transition towards a full decarbonization of the combustion sector, e.g., in power generation. Despite the advantages related to the use of this carbon-free fuel, there are still several challenging technical issues that must be addressed such as the thermoacoustic instability triggered by hydrogen. Given that burners are usually designed to work with methane or other fossil fuels, it is important to investigate their thermoacoustic behavior when fueled by hydrogen. In this framework, the present work aims to propose a methodology which combines Computational Fluid Dynamics CFD (3D Reynolds-Averaged Navier-Stokes (RANS)) and Finite Element Method (FEM) approaches in order to investigate the fluid dynamic and the thermoacoustic behavior introduced by hydrogen in a burner (a lab-scale bluff body stabilized burner) designed to work with methane. The case of CH4-air mixture was used for the validation against experimental results and benchmark CFD data available in the literature. Numerical results obtained from CFD simulations, namely thermofluidodynamic properties and flame characteristics (i.e., time delay and heat release rate) are used to evaluate the effects of the fuel change on the Flame Response Function to the acoustic perturbation by means of a FEM approach. As results, in the H2-air mixture case, the time delay decreases and heat release rate increases with respect to the CH4-air mixture. A study on the Rayleigh index was carried out in order to analyze the influence of H2-air mixture on thermoacoustic instability of the burner. Finally, an analysis of both frequency and growth rate (GR) on the first four modes was carried out by comparing the two mixtures. In the H2-air case the modes are prone to become more unstable with respect to the same modes of the case fueled by CH4-air, due to the change in flame topology and variation of the heat release rate and time delay fields.

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“…Notably, the hydrogen flame is also shown to follow the point of high shear stress when propagating against the inflow, which is considerably faster than its unstretched burning velocity. The flame in a channel has been widely studied in the past with focus on meso-scale combustion [37], symmetrical and asymmetrical flames [38], flame acoustics [39], effect of gas compressibility [40], and flame propagation behaviour [41,42]. In this study, we add another example where the flame in a channel configuration yields important insights on flame physics, owing to its simplicity yet covering also complex effects of dynamic flame stabilization.…”

Section: Introductionmentioning

confidence: 99%

Dynamic stabilization of a hydrogen premixed flame in a narrow channel

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Goey

et al. 2023

Combustion and Flame

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Thermoacoustic analysis of lean premixed hydrogen flames in narrow vertical channels

Cited by 22 publications

References 39 publications

Non-adiabatic modulation of premixed-flame thermoacoustic frequencies in slender tubes

Non-adiabatic modulation of premixed-flame thermoacoustic frequencies in slender tubes

Thermoacoustic Combustion Stability Analysis of a Bluff Body-Stabilized Burner Fueled by Methane–Air and Hydrogen–Air Mixtures

Dynamic stabilization of a hydrogen premixed flame in a narrow channel

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