Effects of CO2 dilution on the interactions of a CH4–air nonpremixed jet flame with a single vortex

Hwang, Cheol-Hong; Oh, Chang Bo; Lee, Chang-Eon

doi:10.1016/j.ijthermalsci.2008.11.003

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…For example, the flame width in cases 2 and 3 was 4 mm, which was 1.15 times wider than that in case 1 (3.5 mm). This behavior was consistent with the flame-spreading behavior in the fuel with CO 2 addition, which was observed by Lee et al [19]. The non-luminous region (blue color) also increased as CO and CO 2 were added.…”

Section: Combustion Behavior Of Post Combustion Simulated Gas Includisupporting

confidence: 90%

Characteristics of Soot and Radiation of Post Combustion Simulated Gas from a Gas Generator

Kim¹,

Song²

2018

Energies

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Abstract:It is necessary to install a specific burner system to burn out fuel-rich post combustion gas produced from a gas generator in a rocket engine when the performance of gas generator is separately evaluated in a test facility. Because of the fuel-rich reburning conditions, the burner still emits a significant amount of soot and produces thermal radiation. In this study, a laboratory-scale coflow diffusion burner was developed to examine the effects of fuel composition in combustion products on the soot emission and radiation behavior. The post combustion gas was simulated by adding carbon monoxide and carbon dioxide to two different base fuels: kerosene vapor and ethylene. The radiation flux sensor and laser extinction apparatus were used to measure the radiation intensity and soot emission, respectively, within a flame. The flame length and temperature were measured to examine the combustion behavior of each sooting flame having a strong radiation. Finally, the relationship between soot emission and radiation intensity was proposed based on all the experimental data.

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Section: Combustion Behavior Of Post Combustion Simulated Gas Includisupporting

confidence: 90%

Characteristics of Soot and Radiation of Post Combustion Simulated Gas from a Gas Generator

Kim¹,

Song²

2018

Energies

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“…The global reaction mechanism has already been validated for the methane oxidation of premixed [39] and non-premixed flames [40]. The combustion reaction is initiated numerically by applying a high ignition temperature (2000 K) to the small area near the fuel-air mixing region and a slightly lower temperature (1300 K) to the porous cap.…”

Section: Methodsmentioning

confidence: 99%

Numerical and Experimental Studies of Mixing Enhancement and Flame Stabilization in a Meso-Scale TPV Combustor With a Porous-Medium Injector and a Heat-Regeneration Reverse Tube

Wang

Hung

Chao

2013

Heat Transfer Engineering

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Understanding the flow dynamics, chemical kinetics, and heat transfer mechanism within a miniature thermophotovoltaic (TPV) combustor is essential for the development of devices for combustion-based power microelectromechanical systems, which may have a much higher energy density than that of conventional batteries. In this study, methods for enhancing the intensity and uniformity of the combustion chamber wall (emitter) illumination through the design of combustion and thermal management of the combustor in a miniature TPV system are proposed, discussed, and demonstrated. The proposed miniature TPV system consists of a swirling combustor with the combustion chamber wall acting as the emitter, a heat-regeneration reverse tube, and mixing-enhancing porous-medium fuel injection, which improves the low nonuniform illumination or incomplete combustion problems associated with conventional miniature TPV systems. Experiments and numerical simulations are performed to analyze the details of the flame structure and flame stabilization mechanism inside the meso-scale combustor with and without a reverse tube. Results indicate that the proposed swirling combustor with a heat-regeneration reverse tube and porous medium can improve the intensity and uniformity of the combustion chamber (emitter) illumination and can increase the surface temperature of the chamber wall. From the systematic numerical and experimental analysis, suitable operational parameters for the meso-scale TPV combustor are suggested, which may be used as a guideline for meso-scale TPV combustor design.

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“…For radiative heat loss, an optically thin radiation model was implemented; the model considered heat losses from CH 4 , CO 2 , H 2 O, and CO [18]. The 2D simulation code adopted in this study has already been validated for the counterflow flame structure [3] and extinction limits [13,14], and it was further validated for the jet flame structure [19] by comparing the experimental results.…”

Section: Methodsmentioning

confidence: 99%

Effects of the Burner Diameter on the Flame Structure and Extinction Limit of Counterflow Non-Premixed Flames

Lee

Park

2010

International Journal of Spray and Combustion Dynamics

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Experiments and numerical simulations were conducted to investigate the effects of the burner diameter on the flame structure and extinction limit of counterflow non-premixed methane flames in normal gravity and microgravity. Experiments were performed for counterflow flames with a large inner diameter (d ) of 50 mm in normal gravity to compare the extinction limits with those obtained by previous studies where a small burner (d < 25 mm) was used. Two-dimensional (2D) simulations were performed to clarify the flame structure and extinction limits of counterflow non-premixed flame with a three-step global reaction mechanism. One-dimensional (1D) simulations were also performed with the same three-step global reaction mechanism to provide reference data for the 2D simulation and experiment. For microgravity, the effect of the burner diameter on the flame location at the centerline was negligible at both high (a g = 50 s −1 ) and low (a g = 10 s −1 ) strain rates. However, a small burner flame (d = 15 mm) in microgravity showed large differences in the maximum flame temperature and the flame size in radial direction compared to a large burner flame (d = 50 mm) at low strain rate. In addition, for normal gravity, a small burner flame (d = 23.4 mm) showed differences in the flame thickness, flame location, local strain rate, and maximum heat release rate compared to a large burner flame (d = 50 mm) at low strain rate. Counterflow non-premixed flames with low and high strain rates that were established in a large burner were approximated by 1D simulation for normal gravity and microgravity. However, a counterflow non-premixed flame with a low strain rate in a small burner could not be approximated by 1D simulation for normal gravity due to buoyancy effects. The 2D simulations of the extinction limits correlated well with experiments for small and large burner flames. For microgravity, the extinction limit of a small burner flame (d = 15 mm) was much lower than that of a large burner flame when a g ≤ 20 s −1 . For normal gravity, the extinction limit of a small burner flame (d = 23.4 mm) was also much lower than that of the large burner flame when a g ≤ 35 s −1 . The effects of the burner diameter on the flame structure and extinction limit of counterflow non-premixed methane flames were more important in normal gravity than in microgravity.

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Effects of CO2 dilution on the interactions of a CH4–air nonpremixed jet flame with a single vortex

Cited by 9 publications

References 20 publications

Characteristics of Soot and Radiation of Post Combustion Simulated Gas from a Gas Generator

Characteristics of Soot and Radiation of Post Combustion Simulated Gas from a Gas Generator

Numerical and Experimental Studies of Mixing Enhancement and Flame Stabilization in a Meso-Scale TPV Combustor With a Porous-Medium Injector and a Heat-Regeneration Reverse Tube

Effects of the Burner Diameter on the Flame Structure and Extinction Limit of Counterflow Non-Premixed Flames

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