2017
DOI: 10.1016/j.proci.2016.06.066
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Abstract: In this paper we present results of direct numerical simulations of lean hydrogen-air flames freely propagating in a planar narrow channel with varying flow rate, using detailed chemistry and transport and including heat losses through the channel walls. Our simulations show that double solutions, symmetric and non-symmetric, can coexist for a given set of parameters. The symmetric solutions are calculated imposing symmetric boundary conditions in the channel mid-plane and when this restriction is relaxed non-… Show more

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Cited by 28 publications
(12 citation statements)
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“…It is also recalled that in addition to the parameters Θ, T w , and R/L f (which have been varied in the present parametric study and are involved in the diagrams of Figures 20 and 21), other factors can be influential in the combustor geometry under consideration. They include (though not limited to) non-symmetric flames [25][26][27][28], the Lewis number [28][29][30][31][32][33] and turbulence [30,31]. Additionally, employing neither adiabatic nor isothermal walls but some intermediate thermal wall conditions (say, similar to Ref.…”
Section: Discussionmentioning
confidence: 99%
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“…It is also recalled that in addition to the parameters Θ, T w , and R/L f (which have been varied in the present parametric study and are involved in the diagrams of Figures 20 and 21), other factors can be influential in the combustor geometry under consideration. They include (though not limited to) non-symmetric flames [25][26][27][28], the Lewis number [28][29][30][31][32][33] and turbulence [30,31]. Additionally, employing neither adiabatic nor isothermal walls but some intermediate thermal wall conditions (say, similar to Ref.…”
Section: Discussionmentioning
confidence: 99%
“…Moreover, the flame velocity does not exhibit much difference for both configurations in the T w = 800 K case, in which both geometries show a constant flame velocity after an initial velocity increase. It is also recalled that only symmetric flame fronts are considered in both geometries in the present work; non-symmetric solutions may exist but they are considered elsewhere [25][26][27][28].…”
Section: Tubes Versus Channelsmentioning
confidence: 99%
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“…2000; Jimenez et al. 2002; Jimenez & Kurdyumov 2017; Jiang, Gordon & Talei 2019; Palulli, Talei & Gordon 2019; Rivera et al. 2019).…”
Section: Direct Numerical Simulation Datasetmentioning
confidence: 99%
“…However, this catalytic ignition mode is quite different from the case in which outside preheating is employed to ignite the gas mixture. When preheating is employed, ignition occurs at the fluid centerline (Jiménez and Kurdyumov, 2017). Once the fluid reaches the ignition temperature, there is an inflection point in the fluid temperature profile.…”
Section: Fig 3 Oh Concentration Profiles Along the Fluid Centerlinementioning
confidence: 99%