Analysis of the spray flame structure in a lab-scale burner using Large Eddy Simulation and Discrete Particle Simulation

Paulhiac, Damien; Cuenot, Bénédicte; Riber, Éléonore; Esclapez, Lucas; Richard, Stéphane

doi:10.1016/j.combustflame.2019.10.013

Cited by 32 publications

(24 citation statements)

References 54 publications

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“…In the last few years alone, a large number of works has used the concept of the Takeno flame index to study flames and improve their prediction: it was used to understand the structure of blue swirling flames (Chung et al 2019), identify flame regimes in thickened flame simulations of spray flames (Hu and Kurose 2019b;Dressler et al 2020) and study the influence of evaporation (Wei et al 2018) as well as devolatilization . Premixed and non-premixed regions in swirl spray flames were analyzed with the flame index concept (Eckel et al 2019;Paulhiac et al 2020) and the influence of swirl number on the combustion regime (Fredrich et al 2019) was evaluated. It was used to study different coal flames (Tufano et al 2018;Wan et al 2019;Rieth et al 2019;, assess the stabilization mechanism of supersonic lifted flames (Bouheraoua et al 2017) and lifted hydrogen flames (Benim et al 2019), classify regions of industrial burners by the combustion regime , study auto-ignition of supercritical hydrothermal flames (Song et al 2019), analyze extinction and re-ignition events (Sripakagorn et al 2004) and gain insight into partially premixed DME flames .…”

Section: Introductionmentioning

confidence: 99%

Identification of Flame Regimes in Partially Premixed Combustion from a Quasi-DNS Dataset

Zirwes

Zhang

Habisreuther

et al. 2020

Flow Turbulence Combust

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Identifying combustion regimes in terms of premixed and non-premixed characteristics is an important task for understanding combustion phenomena and the structure of flames. A quasi-DNS database of the compositionally inhomogeneous partially premixed Sydney/Sandia flame in configuration FJ-5GP-Lr75-57 is used to directly compare different types of flame regime markers from literature. In the simulation of the flame, detailed chemistry and diffusion models are utilized and no turbulence and combustion models are used as the flame front and flow are fully resolved near the nozzle. This allows evaluating the regime markers as a post-processing step without modeling assumptions and directly comparing regime markers based on gradient alignment, drift term analysis and gradient free regime identification. The goal is not to find the correct regime marker, which might be impossible due to the different set of assumptions of every marker and the generally vague definition of the partially premixed regime itself, but to compare their behavior when applied to a resolved turbulent flame with partially premixed characteristics.

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Section: Introductionmentioning

confidence: 99%

Identification of Flame Regimes in Partially Premixed Combustion from a Quasi-DNS Dataset

Zirwes

Zhang

Habisreuther

et al. 2020

Flow Turbulence Combust

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“…7-(top row), common features can be observed regardless of the spray injection angle: the diffusion combustion regime prevails confirming that the flame in this zone is mainly driven by droplet evaporation. Released fuel va- por is immediately burned with the surrounding oxygen mainly at stoichiometry, but, as often observed in evaporation driven flames [33], a broadening of the scatter in the rich side is observed due to the strong evaporation happening in this region. The previously discussed effects resulting from the different injection angles on the droplet dynamics are here visible through the combustion regimes at the flame root.…”

Section: Steady Flamementioning

confidence: 76%

“…Adiabatic non-slip walls are applied elsewhere aside from the quartz tube and chamber backplane where heat losses are taken into account through a heat resistance and temperature values matching the experimental measurements. Chemical reaction is described by a global two-step six-species scheme 2S C7H16 DP with Pre-Exponential Adjustment (PEA) function [33]. Turbulent combustion is modelled using the two-phase flame extension of the dynamic thickened flame model (TP-TFLES) [33].…”

Section: Numerical and Experimental Setupmentioning

confidence: 99%

“…Chemical reaction is described by a global two-step six-species scheme 2S C7H16 DP with Pre-Exponential Adjustment (PEA) function [33]. Turbulent combustion is modelled using the two-phase flame extension of the dynamic thickened flame model (TP-TFLES) [33]. These flames are usually characterised by both premix and diffusion combustion regimes [28], so in order to guarantee a proper application of the thickened flame model, which is correctly defined only for premixed flames, an additional conditioning is applied using the Takeno flame index (FI) [34] classically defined as a function of the gradient of fuel and oxidizer mass fractions:…”

Section: Numerical and Experimental Setupmentioning

confidence: 99%

“…In Fig. 6, instantaneous temperature fields and flame contours coloured by the Takeno flame index highlight the complexity of the present flames which are characterized by both premix and diffusion combustion regimes, a common feature in spray flames [28,33,37]. To better investigate the effect of the different injection angles on the flame structure, a local analysis is performed for three flame regions as shown in Fig.…”

Section: Steady Flamementioning

confidence: 99%

See 2 more Smart Citations

On the impact of fuel injection angle in Euler–Lagrange large eddy simulations of swirling spray flames exhibiting thermoacoustic instabilities

Schiavo

Laera

Riber

et al. 2021

Combustion and Flame

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This study deals with the fundamental problem of combustion dynamics in gas turbine combustors operating with liquid fuel. In this framework the present work proposes the study of an academic liquid fueled combustor sensitive to thermoacoustic instabilities, simulated via high-fidelity Large Eddy Simulations. The experimental setup addressed is SICCA-spray from EM2C laboratory featuring both stable and unstable flames depending on the combustion chamber length. The proposed analysis, based on the Euler-Lagrange modeling approach, studies the impact of the spray injection angle θ on both the stable flame and the triggering of the longitudinal combustor acoustic mode when using a longer quartz tube. For the liquid injection modeling, the FIM-UR semiempirical model is adopted with three different θ values: θ = 35 • , 45 • and 60 • . In stable conditions, the spray angle is proven to have a negligible impact on the flame anchoring point, however, the mean flame length and fuel distribution are found to be slightly modified by the velocity at which droplets enter the combustion chamber. For the thermoacoustically unstable conditions, two well-established stable limit cycles with the same frequency and similar amplitudes are obtained when fuel is injected at θ = 45 • and 60 • . Contrarily, the system stabilizes when θ = 35 • pointing to the importance of the dynamics of the liquid film layer formed inside the injector for this setup. Likewise, this liquid film layer dynamics and its modeling appear critical as already suggested by previous studies on the same configuration. The detailed analysis of the thermoacoustically unstable different predictions is then performed through the investigation of the spatial fields of the local Rayleigh index obtained following the novel extension in the frequency domain of the Rayleigh criterion complemented by the application of Dynamic Mode Decomposition. It confirms that the injection angle of the liquid spray has a significant effect on the thermoacoustic response of the system. Indeed the influence of θ on the dynamics of the liquid fuel when entering the combustion chamber is proven to have an impact on the synchronization mechanism governing the liquid phase with respect to acoustics sustaining the observed limit cycles. More specifically, couplings at the liquid phase level are evidenced by introducing two novel indices correlating the fluctuations of liquid fuel volume fraction and evaporation rate with pressure.

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Studies on theory and modeling of droplet and spray combustion in China: a review

Zhou

2021

Acta Mech. Sin.

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Analysis of the spray flame structure in a lab-scale burner using Large Eddy Simulation and Discrete Particle Simulation

Cited by 32 publications

References 54 publications

Identification of Flame Regimes in Partially Premixed Combustion from a Quasi-DNS Dataset

Identification of Flame Regimes in Partially Premixed Combustion from a Quasi-DNS Dataset

On the impact of fuel injection angle in Euler–Lagrange large eddy simulations of swirling spray flames exhibiting thermoacoustic instabilities

Studies on theory and modeling of droplet and spray combustion in China: a review

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