Ignition features of methane and ethylene fuel-blends in hot and diluted coflows

Evans, Michael J.; Chinnici, Alfonso; Medwell, Paul R.; Ye, J.

doi:10.1016/j.fuel.2017.04.113

Cited by 35 publications

(32 citation statements)

References 71 publications

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“…On the contrary, CO 2 and H 2 O can drastically alter the ignition process in dependence of operating conditions with a twofold interaction. They increase system reactivity at low temperatures (Sabia et al, 2007(Sabia et al, , 2015Sjöberg et al, 2007;Anderlohr et al, 2010;Lubrano Lavadera et al, 2016), but delay it at intermediatehigh temperatures (Mueller et al, 1999;Cadman et al, 2000;de Joannon et al, 2002;Park et al, 2003;Wang et al, 2003Wang et al, , 2013Herzler et al, 2004;Penyazkov et al, 2005;Zabetta et al, 2005;Basevich and Frolov, 2007;Glarborg and Bentzen, 2007;Sjöberg et al, 2007;Gallagher et al, 2008;Le Cong and Dagaut, 2009a,b;Mendiara and Glarborg, 2009;Mardani et al, 2010Mardani et al, , 2013Lee et al, 2012;Sabia et al, 2013Sabia et al, , 2015Chen and Ghoniem, 2014;Xie et al, 2014a;Song et al, 2015;Zou et al, 2015;Hashemi et al, 2016Hashemi et al, , 2017Hashemi et al, , 2019Lubrano Lavadera et al, 2016, 2018aEvans et al, 2017;He et al, 2017;Fedyaeva et al, 2018;Sorrentino et al, 2018;Zhang et al, 2019). ...…”

Section: Discussionmentioning

confidence: 99%

“…For T in >1,120 K, the ignition region extends up to C/O = 0.5. Between the ignition and the pyrolysis-no combustion regions, a low reactivity behavior occurs with a temperature increase lower than 10 K with respect to T in , thus not satisfying the ignition criterion (de Joannon et al, 2002;Evans et al, 2017).…”

Section: Oxidation Process Of Simple Hydrocarbons Under Diluted Condimentioning

confidence: 99%

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Critical Issues of Chemical Kinetics in MILD Combustion

Sabia

Joannon

2020

Front. Mech. Eng.

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Mild combustion processes occur with mixtures highly diluted and preheated by a strong recirculation of hot exhausted gases (thus mass and sensible enthalpy) within the combustion chamber. This strategy configures a process based on autoignition kernels outside or close to flammability limits transported by convection in the combustion chamber, thus defining a process with unique physical and chemical features drastically different from traditional deflagrative-diffusive flames. The article aims at analyzing the recent issues relative to kinetic aspects involved in moderate or intense low-oxygen dilution (MILD) combustion processes. First, the article comes through the identification of peculiar experimental features of simple hydrocarbons oxidation process induced by highly preheated and diluted conditions in model reactors typical of chemical engineering. Second, the effects of steam and carbon dioxides on fuel oxidation process, whose presence within the combustion chamber is imposed by high levels of hot gas recirculation, are addressed. Third, the article comes through a thorough analysis of recent scientific contributions on kinetic aspects of MILD combustion processes to identify the critical points in modeling activities.

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Section: Discussionmentioning

confidence: 99%

Section: Oxidation Process Of Simple Hydrocarbons Under Diluted Condimentioning

confidence: 99%

Critical Issues of Chemical Kinetics in MILD Combustion

Sabia

Joannon

2020

Front. Mech. Eng.

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“…In addition to experimental investigations, increasing attention has been paid to the numerical modelling of the JHC burner. Most numerical investigations were carried out using Reynolds Averaged Navier-Stokes (RANS) simulations [21][22][23][24][25][26][27][28][29][30][31][32], while only a few studies were based on Large Eddy Simulation (LES) [33,34].…”

Section: Introductionmentioning

confidence: 99%

Characterization of jet-in-hot-coflow flames using tangential stretching rate

Galassi

Ciottoli

et al. 2019

Combustion and Flame

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“…Laser diagnostics a provide means to investigate the small-scale and distributed reaction zones in macroscopically-near-homogeneous MILD combustion conditions. Such research not only improves the understanding of the behavior of these regimes, but provide reference cases and motivation for complementary numerical studies (Ihme and See, 2011;de Joannon et al, 2012;Ihme et al, 2012;Sabia et al, 2015;Sidey and Mastorakos, 2015;Medwell et al, 2016;Evans et al, 2017aEvans et al, ,b, 2019cSorrentino et al, 2017;Doan and Swaminathan, 2019;Wang et al, 2019a) which could otherwise be performed in isolation or target conditions with either limited practical applicability or data for model validation.…”

Section: Introductionmentioning

confidence: 99%

Understanding and Interpreting Laser Diagnostics in Flames: A Review of Experimental Measurement Techniques

Evans

Medwell

2019

Front. Mech. Eng.

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There is a wealth of existing experimental data of flames collected using laser diagnostics. The primary objective of this review is to provide context and guidance in interpreting these laser diagnostic data. This educational piece is intended to benefit those new to laser diagnostics or with specialization in other facets of combustion science, such as computational modeling. This review focuses on laser-diagnostics in the context of the commonly used canonical jet-in-hot-coflow (JHC) burner, although the content is applicable to a wide variety of configurations including, but not restricted to, simple jet, bluff body, swirling and stratified flames. The JHC burner configuration has been used for fundamental studies of moderate or intense low oxygen dilution (MILD) combustion, autoignition and flame stabilization in hot environments. These environments emulate sequential combustion or exhaust gas recirculation. The JHC configuration has been applied in several burners for parametric studies of MILD combustion, flame reaction zone structure, behavior of fuels covering a significant range of chemical complexity, and the collection of data for numerical model validation. Studies of unconfined JHC burners using gaseous fuels have employed point-based Rayleigh-Raman or two-dimensional Rayleigh scattering measurements for the temperature field. While the former also provides simultaneous measurements of major species concentrations, the latter has often been used in conjunction with planar laser-induced fluorescence (PLIF) to simultaneously provide quantitative or qualitative measurements of radical and intermediary species. These established scattering-based thermography techniques are not, however, effective in droplet or particle laden flows, or in confined burners with significant background scattering. Techniques including coherent anti-Stokes Raman scattering (CARS) and non-linear excitation regime two-line atomic fluorescence (NTLAF) have, however, been successfully demonstrated in both sooting and spray flames. This review gives an overview of diagnostics techniques undertaken in canonical burners, with the intention of providing an introduction to laser-based measurements in combustion. The efficacy, applicability and accuracy of the experimental techniques are also discussed, with examples from studies of flames in JHC burners. Finally, current and future directions for studies of flames using the JHC configuration including spray flames and studies and elevated pressures are summarized.

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Ignition features of methane and ethylene fuel-blends in hot and diluted coflows

Cited by 35 publications

References 71 publications

Critical Issues of Chemical Kinetics in MILD Combustion

Critical Issues of Chemical Kinetics in MILD Combustion

Characterization of jet-in-hot-coflow flames using tangential stretching rate

Understanding and Interpreting Laser Diagnostics in Flames: A Review of Experimental Measurement Techniques

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