Diffusion flame stabilized on a porous plate in a parallel airstream

Rohmat, Tri A.; Katoh, Hiroyuki; Obara, Tetsuro; Yoshihashi, Teruo; Ohyagi, Shigeharu

doi:10.2514/3.14071

Cited by 3 publications

(13 citation statements)

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“…As expected, with the decrease in fuel injection velocity from 0.05 m/s to 0.015 m/s, the flame stand-off distance reduces. For v w = 0.05 m/s a steady plate stabilized flame is obtained and this is consistent with the stability diagram provided in Rohmat et al [13]. The ratio of the momentum flux of air (ρV 2 ) air to that of fuel (ρV 2 ) fuel has a value around 725 for this case, where ρ is the density and V is the velocity.…”

Section: Resultssupporting

confidence: 69%

“…Since the air momentum has increased relatively, fuel transport gets affected. As per the stability diagram in Rohmat et al [13], an oscillatory flame should be observed. This is due to the fluctuations in the amount of fuel reaching the combustion zone.…”

Section: Resultsmentioning

confidence: 99%

“…Since these flames are also two-dimensional in nature [13], a 2D domain has been employed. Figure 5 show the laminar boundary layer diffusion flame established over a flat plate, when methane is injected perpendicularly into an air stream flowing parallel to the plate surface.…”

Section: Resultsmentioning

confidence: 99%

“…Raghunandan and Yogesh [12] put a thin diaphragm as an obstacle at the leading edge of a porous plate to study its effects on the stability, structure, and heat transfer to the wall. Rohmat et al [13] conducted experiments on the diffusion flames established over horizontal flat plate with and with out obstacles. They considered two types of obstacles, a backward facing step and a rectangular cylinder, located upstream of a porous plate, through which methane was injected.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Laminar Diffusion Flames Established on a Horizontal Flat Plate in a Parallel Air Stream

Gopalakrishnan

Raghavan

2011

International Journal of Spray and Combustion Dynamics

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Numerical investigation of laminar diffusion flames established on a flat plate in a parallel air stream is presented. A numerical model with a multi-step chemical kinetics mechanism, variable thermo-physical properties, multi-component species diffusion and a radiation sub-model is employed for this purpose. Both upward and downward injection of fuel has been considered in a normal gravity environment. The thermal and aerodynamic structure of the flame has been explained with the help of temperature and species contours, net reaction rate of fuel and streamlines. Flame characteristics and stability aspects for several air and fuel velocity combinations have been studied. An important characteristic of a laminar boundary layer diffusion flame with upward injection of fuel is the velocity overshoot that occurs near the flame zone. This is not observed when the fuel is injected in the downward direction. The flame standoff distance is slightly higher for the downward injection of fuel due to increase in displacement thickness of boundary layer. Influence of an obstacle, namely the backward facing step, on the flame characteristics and stability aspects is also investigated. Effects of air and fuel velocities, size and location of the step are studied in detail. Based on the air and fuel velocities, different types of flames are predicted. The use of a backward-facing step as a flame holding mechanism for upward injection of fuel, results in increased stability limits due to the formation of a recirculation zone behind the step. The predicted stability limits match with experimentally observed limits. The step location is seen to play a more important role as compared to the step height in influencing the stability aspects of flames.

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Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Laminar Diffusion Flames Established on a Horizontal Flat Plate in a Parallel Air Stream

Gopalakrishnan

Raghavan

2011

International Journal of Spray and Combustion Dynamics

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“…A very limited amount of works were devoted to the investigation of conditions of flame detachment in a separated flow near a flat surface with injection. In [3][4][5], based on visual observations, the diagrams of combustion and flame-off modes were obtained for some hydrocarbon fuels and the geometry of the barriers forming the detached flow zones. There are other ways to stabilize the flame.…”

Section: Introductionmentioning

confidence: 99%

Features of flame stabilization in near wall flows

Lukashov

Терехов

2017

MATEC Web Conf.

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Abstract. The results of the experimental and numerical study of the influence of obstacle geometry on the conditions of flame stabilisation in the turbulent boundary layer with fuel injection near a porous surface are presented. The features of the detachment zones formation in the turbulent reacting flow behind the obstacle are studied. The obtained results are compared with the data on flame-off conditions when flowing over a flat surface.

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Experimental Study of Non-Premixed Flames of Liquefied Petroleum Gas and Air in Cross-Flow and the Effects of Fuel Properties on Flame Stability

Kumaran

Raghavan

2019

International Journal of Turbo &Amp; Jet-Engines

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Stability of flames are affected by fuel properties, geometry of the burner and operating conditions. In this experimental work, first the characteristics of non-premixed flames of Liquefied Petroleum Gas (LPG) and air in cross-flow configuration, where air jet flows perpendicular to the fuel stream, are studied experimentally. Flame transition and stability regimes of non-premixed flames of LPG and air, in a cross-flow burner without and with obstacles, are determined by systematically varying the fuel and air flow rates. Obstacles such as backward facing step and cylindrical bluff bodies are considered. Subsequently, the effects of fuel properties on the stability of flames are analyzed, Flame stability regimes of natural gas (methane) and biogas (methane and carbon-dioxide), measured from a similar burner are available in literature. These have been compared with the stability of LPG flames in terms of power rating of the burner and global equivalence ratio (defined for non-premixed flames).

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Diffusion flame stabilized on a porous plate in a parallel airstream

Cited by 3 publications

References 0 publications

Numerical Investigation of Laminar Diffusion Flames Established on a Horizontal Flat Plate in a Parallel Air Stream

Numerical Investigation of Laminar Diffusion Flames Established on a Horizontal Flat Plate in a Parallel Air Stream

Features of flame stabilization in near wall flows

Experimental Study of Non-Premixed Flames of Liquefied Petroleum Gas and Air in Cross-Flow and the Effects of Fuel Properties on Flame Stability

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