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Journal ArticleDOI

An investigation of flame zones and burning velocities of laminar unconfined methane-oxygen premixed flames

02 Mar 2012-Combustion Theory and Modelling (Taylor & Francis Group)-Vol. 16, Iss: 2, pp 199-219
TL;DR: In this article, an experimental and numerical investigation of unconfined methane-oxygen laminar premixed flames was conducted using pure methane and pure oxygen mixtures having different equivalence ratios.
Abstract: Numerical and experimental investigations of unconfined methane-oxygen laminar premixed flames are presented. In a lab-scale burner, premixed flame experiments have been conducted using pure methane and pure oxygen mixtures having different equivalence ratios. Digital photographs of the flames have been captured and the radial temperature profiles at different axial locations have been measured using a thermocouple. Numerical simulations have been carried out with a C2 chemical mechanism having 25 species and 121 reactions and with an optically thin radiation sub-model. The numerical results are validated against the experimental and numerical results for methane-air premixed flames reported in literature. Further, the numerical results are validated against the results from the present methane-oxygen flame experiments. Visible regions in digital flame photographs have been compared with OH isopleths predicted by the numerical model. Parametric studies have been carried out for a range of equivalence rati...
Citations
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28 Feb 2005
TL;DR: In this paper, the authors present a survey of the state of the art in the area of e-mail communications in the PLZ/PLZ/Ort area: Tel:(__________) ________________ (___________) __________________________ Fax (_______________) ___________ ) _______________ ___________________________________________ E-mail __________________________________ _______________________________________
Abstract: ________________________________ _______________________________________ ________________________________ _______________________________________ ________________________________ _______________________________________ Straße/Postfach ___________________ _______________________________________ PLZ/Ort ________________________ _______________________________________ Tel.:(__________) ________________ (___________) __________________________ Fax (__________) ________________ (___________) __________________________ E-Mail __________________________ _______________________________________

87 citations

Journal ArticleDOI
TL;DR: In this article, the authors present numerical simulations of a core methane jet diffusion flame with a fuel lean mixture (consisting of methane and hydrogen, in different proportions) in the co-flow.

4 citations

01 Jan 2014
TL;DR: In this paper, a steady-state axisymmetric computational model of the flame, combustion reactions, and air entrainment has been combined with a transient model of heat transfer in the refractory walls to simulate the SEN preheating process.
Abstract: Adequate preheating of the submerged entry nozzle (SEN) is important to avoid problems such as cracks and skulling, and depends on torch configuration, fuel, SEN geometry and other factors. A steady-state axisymmetric computational model of the flame, combustion reactions, and air entrainment has been combined with a transient model of heat transfer in the refractory walls to simulate the SEN preheating process. The model predictions match with experimental measurements of preheating with a natural-gas torch, including temperature profile across the flame, temperature histories measured inside the SEN wall, the flame shape, and the SEN outer wall temperature distribution. A simple spread-sheet model is introduced to accurately predict flame temperature, heat transfer coefficients and product properties for simple models of SEN preheating, given the air entrainment predicted from the combustion model. The results reveal the times required to reach adequate preheating temperature. Moreover, optimal positioning of the torch above the top of the SEN decreases ambient air entrainment, which increases the temperatures and shortens preheating time.

1 citations

References
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Book
01 Jan 1977
TL;DR: In this article, the authors estimate physical properties of pure components and Mixtures and show that the properties of these components and mixtures are similar to those of ideal gases and liquids.
Abstract: Chapter 1: The Estimation of Physical Properties. Chapter 2: Pure Component Constants. Chapter 3: Thermodynamic Properties of Ideal Gases. Chapter 4: Pressure-Volume-Temperature Relationships of Pure Gases and Liquids. Chapter 5: Pressure-Volume-Temperature Relationships of Mixtures. Chapter 6: Thermodynamic Properties of Pure Components and Mixtures. Chapter 7: Vapor Pressures and Enthalpies of Vaporization of Pure Fluids. Chapter 8: Fluid Phase Equilibria in Multicomponent Systems. Chapter 9: Viscosity. Chapter 10: Thermal Conductivity. Chapter 11: Diffusion Coefficients. Chapter 12: Surface Tension.

14,380 citations

Journal ArticleDOI

3,799 citations


"An investigation of flame zones and..." refers methods in this paper

  • ...Viscosity, binary mass diffusivity between any two species and thermal conductivity are calculated using kinetic theory [24]....

    [...]

01 Oct 1993
TL;DR: In this article, a library of thermodynamic data and transport properties are given for individual species in the form of least-squares coefficients for 1130 solid, liquid, and gaseous species.
Abstract: Libraries of thermodynamic data and transport properties are given for individual species in the form of least-squares coefficients. Values of C(sup 0)(sub p)(T), H(sup 0)(T), and S(sup 0)(T) are available for 1130 solid, liquid, and gaseous species. Viscosity and thermal conductivity data are given for 155 gases. The original C(sup 0)(sub p)(T) values were fit to a fourth-order polynomial with integration constants for H(sup 0)(T) and S(sup 0)(T). For each species the integration constant for H(sup 0)(T) includes the heat of formation. Transport properties have a different functional form. The temperature range for most of the data is 300 to 5000 K, although some of the newer thermodynamic data have a range of 200 to 6000 K. Because the species are mainly possible products of reaction, the data are useful for chemical equilibrium and kinetics computer codes. Much of the data has been distributed for several years with the NASA Lewis equilibrium program CET89. The thermodynamic properties of the reference elements were updated along with about 175 species that involve the elements carbon, hydrogen, oxygen, and nitrogen. These sets of data will be distributed with the NASA Lewis personal computer program for calculating chemical equilibria, CETPC.

715 citations


"An investigation of flame zones and..." refers methods in this paper

  • ...Specific heat capacities are calculated using temperature dependent piecewise polynomial functions [25]....

    [...]

Journal ArticleDOI
TL;DR: In this article, the effect of temperature on the mass burning rate of a spherically expanding flame propagating at constant pressure and the effect by the associated Markstein lengths was investigated.

711 citations

Journal ArticleDOI
TL;DR: In this paper, the variation of burning velocity with equivalence ratio for methane-air mixtures at one atmosphere pressure values were determined by the bombhot wire and corrected density ratio techniques, for combustion during the prepressure period.

431 citations