Spark ignition of propane-air mixtures near the minimum ignition energy: Part II. A model development

Ko, Yeji; Arpacı, Vedat S.; Anderson, Richard W.

doi:10.1016/0010-2180(91)90205-p

Cited by 37 publications

(18 citation statements)

References 27 publications

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“…The predicted temperature field was found to vary from 750 o C at the inlet to 1660 o C during full combustion. This value compares very well with the computed flame temperature (1800 o C) of propane/air mixture of Ko, et al [19]. However, the computed maximum flame temperature underestimates the adiabatic flame temperature (1980 o C) of premixed propane/air mixture by about 16%.…”

Section: Engineering Journalsupporting

confidence: 75%

Reduced Mechanism Approach of Modeling Premixed Propane-Air Mixture Using ANSYS Fluent

Anetor¹,

Osakue²,

Odetunde³

2012

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Abstract. In combustion computational analysis, reduced mechanisms are often used in place of detailed kinetic chemistry. Since the computational costs of including all the species in the reactor model are always prohibitively high, several reduced mechanisms have been developed for propane and other hydrocarbon oxidation. In this study we employed ANSYS Fluent Computational Fluid Dynamics (CFD) package, (hereinafter referred to as Fluent) to analyze propane oxidation mechanism in a conical reactor.The k - scheme was used to model the effects of turbulence. The reaction kinetics employed in this study is that based on the work of Westbrook and Dryer [14] [20]. The results show that the bulk of the turbulent kinetic energy was produced in the inlet jet. The computed values of * y were found to confirm that the use of the law-of-the-wall functions was valid and also showed that the computational mesh for the present model was appropriate.

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Section: Engineering Journalsupporting

confidence: 75%

Reduced Mechanism Approach of Modeling Premixed Propane-Air Mixture Using ANSYS Fluent

Anetor¹,

Osakue²,

Odetunde³

2012

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“…Heat transfer and gas ionisation caused by the spark discharge initiates a flame kernel [1]. In a second phase, which is dominated by thermal diffusion, the flame kernel eventually grows into a flame front that spreads through the combustion chamber [2]. Although a small flame kernel has been established during the spark ignition phase, it can be quenched even in a laminar flow due to its spherical geometry [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Turbulence on Self-sustained Combustion in Premixed Flame Kernels: A Direct Numerical Simulation (DNS) Study

Klein

Chakraborty

Cant

2008

Flow Turbulence Combust

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The effects of mean flame radius and turbulence on self-sustained combustion of turbulent premixed spherical flames in decaying turbulence have been investigated using three-dimensional direct numerical simulations (DNS) with single step Arrhenius chemistry. Several flame kernels with different initial radius or initial turbulent field have been studied for identical conditions of thermo-chemistry. It has been found that for very small kernel radius the mean displacement speed may become negative leading ultimately to extinction of the flame kernel. A mean negative displacement speed is shown to signify a physical situation where heat transfer from the kernel overcomes the heat release due to combustion. This mechanism is further enhanced by turbulent transport and, based on simulations with different initial turbulent velocity fields, it has been found that self-sustained combustion is adversely affected by higher turbulent velocity fluctuation magnitude and integral length scale. A scaling analysis is performed to estimate the critical radius for self-sustained combustion in premixed flame kernels in a turbulent environment. The scaling analysis is found to be in good agreement with the results of the simulations.

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“…The first part of the present experimental study provides data for the validation of a model for flame kernel growth developed in Part H [41]. A high-speed laser schlieren technique is used to record developing spark kernels near the minimum ignition energy.…”

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confidence: 99%

“…The study is divided into two parts: the first part is experimental and the second part deals with an intuitive-analytical modeling of the experimental results [41]. The first part consists of five sections: following this introduction, Sec.…”

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confidence: 99%

Spark ignition of propane-air mixtures near the minimum ignition energy: Part I. An experimental study

Anderson

Arpacı

1991

Combustion and Flame

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Kernel growth from a spark in propane-air mixtures at atmospheric pressure is studied in a constant volume bomb with a high-speed laser schlieren system. The spark current and voltage waveforms of an inductive ignition source are simultaneously recorded with the photographic recordings. The temporal growth of the measured equivalent radii at conditions near the minimum ignition energy shows the existence of a critical radius and the influence of the critical radius on kernel development. In addition, it is shown that the net spark power for ignition can be estimated using data from minimum ignition energy, electrode fall energy losses, and spark calorimetry experiments. These results are used in Part II to develop a model for kernel growth.

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Spark ignition of propane-air mixtures near the minimum ignition energy: Part II. A model development

Cited by 37 publications

References 27 publications

Reduced Mechanism Approach of Modeling Premixed Propane-Air Mixture Using ANSYS Fluent

Reduced Mechanism Approach of Modeling Premixed Propane-Air Mixture Using ANSYS Fluent

Effects of Turbulence on Self-sustained Combustion in Premixed Flame Kernels: A Direct Numerical Simulation (DNS) Study

Spark ignition of propane-air mixtures near the minimum ignition energy: Part I. An experimental study

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