241.
Wind-aided flame spread under oblique forced flow
- Tizón Pulido, Juan Manuel; Salvá Monfort, José Juan; Liñán Martínez, Amable
he wind-aided flame spread process along a solid fuel rod under oblique forced flow is analyzed in absence of gravity or when the forced flow dominates the gravity-induced flow.
242.
Premixed edge-flames under transverse enthalpy gradients
- Daou, J.; Matalon, M.; Liñán Martínez, Amable
The first one, denoted by ?, represents the difference in the enthalpy of the feed streams.
243.
Ignition in the viscous layer between counterflowing streams: Asymptotic theory with comparison to experiments
- Seiser, R.; Seshadri, K.; Piskernik, E.; Liñán Martínez, Amable
The characteristic Reynolds numbers of the counterflowing streams are presumed to be large so that the thickness of the viscous layer formed in the vicinity of the stagnation plane is small.
244.
The reduced kinetic description of lean premixed combustion
- Sánchez Pérez, Antonio Luis; Lépinette, A.; Liñán Martínez, Amable; Lázaro Gómez, Benigno
Lean premixed methane-air flames are investigated in an effort to facilitate the numerical description of CO and NO emissions in LP (lean premixed) and LPP (lean premixed prevaporized) combustion systems.
245.
The reduced kinetic description of lean premixed combustion
- Sánchez Pérez, Antonio Luis; Lépinette, A.; Bollig, M.; Liñán Martínez, Amable; Lázaro Gómez, Benigno
Lean premixed methane-air flames are investigated in an effort to facilitate the numerical description of CO and NO emissions in LP (lean premixed) and LPP (lean premixed prevaporized) combustion systems.
246.
Laminar mixing in diluted and undiluted fuel jets upstream from lifted flames
- Revuelta Bayod, Antonio; Sánchez Pérez, Antonio Luis; Liñán Martínez, Amable
The problem is integrated for relevant values of the flow parameters, including values of the stoichiometric air-to-fuel mass ratio S of order unity, when the lifted flame is located in the region of jet development, corresponding to distances from the injector of order Re a.
247.
On the calculation of the minimum ignition energy
- Kurdyumov, V.; Blasco, J.; Sánchez Pérez, Antonio Luis; Liñán Martínez, Amable
The success of the initiation of a deflagration by an external energy source depends on the competition of heat conduction and radical diffusion with chemical heat release.
248.
Lift-off and blowoff of a diffusion flame between parallel streams of fuel and air
- Fernández Tarrazo, Eduardo; Vera Coello, Marcos; Liñán Martínez, Amable
A numerical analysis is presented to describe the liftoff and blowoff of a diffusion flame in the mixing layer between two parallel streams of fuel (mainly methane diluted with nitrogen) and air emerging from porous walls.
249.
A simple one-step chemistry model for partially premixed hydrocarbon combustion
- Fernández Tarrazo, Eduardo; Sánchez Pérez, Antonio Luis; Liñán Martínez, Amable; Williams, F.A.
Computations of planar premixed flames are used in the selection of the three model parameters: the heat of reaction q, the activation temperature Ta, and the preexponential factor B.
250.
A priori testing of subgrid models for chemically reacting non-premixed turbulent shear flows
- Jiménez Sendín, Javier; Liñán Martínez, Amable; Rogers, Michael M.; Higuera Antón, Francisco
The beta-assumed-p.d.f.
251.
Laminar free convection induced by a line heat source, and heat transfer from wires at small Grashof numbers
- Liñán Martínez, Amable; Kurdyumov, V.
These constants are used when calculating the free convection heat transfer from wires (or cylinders of non-circular shape) at small Grashof numbers.
252.
Free and forced convection around line sources of heat and heated cylinders in porous media
- Kurdyumov, V.; Liñán Martínez, Amable
An analysis is presented for the steady, two-dimensional, free convection around line sources of heat and heated cylinders in unbounded saturated porous media.
253.
Longitudinal acoustic instabilities in slender solid propellant rockets : linear analysis
- García Schafer, Juan Esteban; Liñán Martínez, Amable
To describe the acoustic instabilities in the combustion chambers of laterally burning solid propellant rockets the interaction of the mean flow with the acoustic waves is analysed, using multiple scale techniques, for realistic cases in which the combustion chamber is slender and the nozzle area is small compared with the cross-sectional area of the chamber.
254.
Confined axisymmetric laminar jets with large expansion ratios
- Revuelta Bayod, Antonio; Sánchez Pérez, Antonio Luis; Liñán Martínez, Amable
This paper investigates the steady round laminar jet discharging into a coaxial duct when the jet Reynolds number, Re/sub j/, is large and the ratio of the jet radius to the duct radius, epsiv, is small.
255.
On the interaction of vortices with mixing layers
- Vera Coello, Marcos; Liñán Martínez, Amable
We describe the perturbations introduced by two counter-rotating vortices - in a two-dimensional configuration - or by a vortex ring - in an axisymmetric configuration - to the mixing layer between two counterflowing gaseous fuel and air streams of the same density.
256.
Simulations of starting gas jets at low Mach numbers
- Iglesias Estradé, Inmaculada; Vera Coello, Marcos; Sánchez Pérez, Antonio Luis; Liñán Martínez, Amable
The starting jet produced by the impulsively started discharge of a submerged gas stream of constant velocity through a circular orifice in a plane wall is investigated by integrating numerically the axisymmetric Navier-Stokes equations for moderately large values of the jet Reynolds number.
257.
Simplified approach to the numerical description of methane-air diffusion flames
- Bollig, M.; Liñán Martínez, Amable; Sánchez Pérez, Antonio Luis; Williams, F.A.
Starting with a three-step reduced chemistry description that employes H2 and CO as the only intermediates not in steady state, a simplified formulation aimed at facilitating numerical computations of non-premixed methane-air systems is developed.
258.
Vortex-induced extinction behavior in methanol gaseous flames: A comparison with quasi-steady extinction
- Santoro, Vito S.; Kyritsis, D.C.; Liñán Martínez, Amable; Gomez, Alessandro
Using a combination of HCHO planar laser-induced fluorescence and laser Doppler velocimetry measurements, the extinction behavior of methanol counterflow diffusion flames was examined experimentally under conditions in which the extinction was brought about by a vortex generated on the oxidizer side.
259.
The anchoring of gaseous jet diffusion flames in stagnant air
- Kurdyumov, V.; Fernández Tarrazo, Eduardo; Liñán Martínez, Amable
A numerical analysis is presented to describe the structure of the attachment region of gaseous jet diffusion flames in stagnant air.
260.
Autoignition of hydrogen/air mixtures by a thin catalytic wire
- Treviño, C.; Liñán Martínez, Amable; Kurdyumov, V.
The autoignition of the catalytic reaction of hydrogen/air mixtures on thin palladium wires is analyzed in this paper.
