On the impact of H<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si4.svg"><mml:msub><mml:mrow/><mml:mn>2</mml:mn></mml:msub></mml:math>-enrichment on flame structure and combustion dynamics of a lean partially-premixed turbulent swirling flame

Agostinelli, Pasquale Walter; Laera, Davide; Chterev, Ianko; Boxx, Isaac; Gicquel, Laurent; Poinsot, Thiérry

doi:10.1016/j.combustflame.2022.112120

Cited by 27 publications

(6 citation statements)

References 116 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The combustor walls and the bluff body plane are set to no-slip isothermal walls with a fixed temperature of 600 0.25em K. The combustor wall temperature is an estimated value based on measurements of a similar burner configuration as mentioned in Tay-Wo-Chong et al 48 , Previous studies 61–63 show that wall heat transfer in the combustion chamber is very important for correct modeling of the flame shape (and therefore the flame dynamics) in swirl-stabilized combustors. Uncertainty in wall temperature in the experiment might cause deviations in the flame response evaluation with LES 64 .…”

Section: Turbulent Premixed Swirl Burnermentioning

confidence: 99%

“…For a better agreement in the close vicinity of the combustion chamber entry, a more advanced modeling approach for the wall temperature boundary conditions (i.e. conjugate heat transfer) at the backplane has to be used in LES 62,63 . However, a correct modeling is very challenging because there is no reliable data on wall temperatures from the experiment.…”

Section: Unforced Flow/flame Validationmentioning

confidence: 99%

See 1 more Smart Citation

Incompressible versus compressible large eddy simulation for the identification of premixed flame dynamics

Eder

Silva

Haeringer

et al. 2023

International Journal of Spray and Combustion Dynamics

View full text Add to dashboard Cite

The present work compares the respective advantages and disadvantages of compressible and incompressible computational fluid dynamics (CFD) formulations when used for the estimation of the acoustic flame response. The flame transfer function of a turbulent premixed swirl-stabilized burner is determined by applying system identification (SI) to time series data extracted from large eddy simulation (LES). By analyzing the quality of the results, the present study shows that incompressible simulations exhibit several advantages over their compressible counterpart with equal prediction of the flame dynamics. On the one hand, the forcing signals can be designed in such a way that desired statistical properties can be enhanced, while maintaining optimal values in the amplitude. On the other hand, computational costs are reduced and the implementation is fundamentally simpler due to the absence of acoustic wave propagation and corresponding resonances in the flame response or even self-excited acoustic oscillations. Such an increase in efficiency makes the incompressible CFD/SI modeling approach very appealing for the study of a wide variety of systems that rely on premixed combustion. In conclusion, the present study reveals that both methodologies predict the same flame dynamics, which confirms that incompressible simulation can be used for thermoacoustic analyses of acoustically compact velocity-sensitive flames.

show abstract

Section: Turbulent Premixed Swirl Burnermentioning

confidence: 99%

Section: Unforced Flow/flame Validationmentioning

confidence: 99%

Incompressible versus compressible large eddy simulation for the identification of premixed flame dynamics

Eder

Silva

Haeringer

et al. 2023

International Journal of Spray and Combustion Dynamics

View full text Add to dashboard Cite

show abstract

“…Gadalla et al [25] analyzed by LES the impact of tri-fuel (diesel-methanol-hydrogen) combustion for marine applications. For what concerns methane enrichment with hydrogen, e.g., Laera et al [26] focused on the stabilization of CH 4 flames with H 2 injection, Agostinelli et al [27] studied the impact of H 2 -enrichment on the flame structure and combustion dynamics of a CH 4 -air swirling flame, and Afarin et al [28] investigated methane/hydrogen mixtures in MILD regime. Also ammonia blended with hydrogen has been studied with particular attention to the NO production [29].…”

Section: Introductionmentioning

confidence: 99%

NOx pathways in lean partially premixed swirling H2‐air turbulent flame

Capurso

Laera

Riber

et al. 2023

Combustion and Flame

Self Cite

View full text Add to dashboard Cite

“…As a promising technique to decarbonising the existing gas turbine engines, direct injection (or addition in a non-premixed way) of hydrogen has gained much attention 8,9 . Thus, understanding the interaction between hydrogen diffusion flame and vortical structures in turbulent flow is necessary for such techniques to be applied in next-generation gas turbines.…”

Section: Introductionmentioning

confidence: 99%

Direct numerical simulations of the Taylor-Green Vortex interacting with a hydrogen diffusion flame: Reynolds number and non-unity Lewis number effects

Xu¹,

Chen²

2023

Preprint

View full text Add to dashboard Cite

Understanding the interactions between hydrogen flame and turbulent vortices is important for developing the next-generation carbon neutral combustion systems.In the present work, we perform several direct numerical simulation (DNS) cases to study the dynamics of a hydrogen diffusion flame embedded in the Taylor-Green Vortex (TGV). The evolution of flame and vortex is investigated for a range of initial Reynolds numbers up to 3200 with different mass diffusion models. We show that the vortices dissipate rapidly in cases at low Reynolds numbers, while the consistent stretching, splitting and twisting of vortex tubes are observed in cases with evident turbulence transition at high Reynolds numbers. Regarding the interactions between the flame and vortex, it is demonstrated that the heat release generated by the flame has suppression effects on the turbulence intensity and its development of the TGV.Meanwhile, the intense turbulence provides abundant kinetic energy, accelerating the mixing of the diffusion flame with a contribution to higher strain rate and larger curvatures of the flame. Considering the effects of non-unity Lewis number, it is revealed that the flame strength is more intense in the cases with mixture averaged model. However, this effect is relatively suppressed under the impacts of the intense turbulence.

show abstract

On the impact of H2-enrichment on flame structure and combustion dynamics of a lean partially-premixed turbulent swirling flame

Cited by 27 publications

References 116 publications

Incompressible versus compressible large eddy simulation for the identification of premixed flame dynamics

Incompressible versus compressible large eddy simulation for the identification of premixed flame dynamics

NOx pathways in lean partially premixed swirling H2‐air turbulent flame

Direct numerical simulations of the Taylor-Green Vortex interacting with a hydrogen diffusion flame: Reynolds number and non-unity Lewis number effects

Contact Info

Product

Resources

About