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Journal ArticleDOI

Numerical analysis of two-ring flame stabilizer flows in aircraft afterburners

TL;DR: In this article, a computational procedure is described for the calculation of isothermal flow fields of two-ring flame stabilizers in practical afterburners and also for the reacting flow parameters in a research afterburner.
Abstract: A computational procedure is described for the calculation of isothermal flow fields of two-ring flame stabilizers in practical afterburners and also for the reacting flow parameters in a research afterburner. The predictions have been obtained using a finite volume solution procedure for the steady three-dimensional elliptic equations of fluid flow. The physical models include the κ-e turbulence model, eddy breakup model, two-step reaction model, droplet vaporization and combustion model, and six-flux radiation model. The presence of radial gutters and staggering the distance between two-ring gutters alter the afterburner flow patterns considerably, including the elimination of diffuser stall and flow separation losses near the diffuser. The predicted and measured emissions in the research afterburner geometry agree qualitatively. The effect of the fuel to air ratio and location of the fuel injector on the temperature and species concentration distribution are presented in detail.
Citations
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Journal ArticleDOI
TL;DR: In this article, the impact of the turbulent temperature fluctuations on soot processes and consequently on radiation heat transfer in a small furnace is investigated using a simplified approach based on presumed PDFs for temperature.

3 citations

Journal ArticleDOI
TL;DR: In this paper, a gear-shaped combustion stabilization device was added to the end of a primary coal burner to control the combustion behavior of an aggregate drying pulverized coal burner.
Abstract: To achieve a smooth control of the pulverized coal combustion behavior of an aggregate drying pulverized coal burner, a gear-shaped combustion stabilization device was added to the end of primary t...
References
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Book
01 Jan 1980
TL;DR: In this article, the authors focus on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms.
Abstract: This book focuses on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms. Using simple algebra and elementary calculus, the author develops numerical methods for predicting these processes mainly based on physical considerations. Through this approach, readers will develop a deeper understanding of the underlying physical aspects of heat transfer and fluid flow as well as improve their ability to analyze and interpret computed results.

21,858 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a review of the applicability and applicability of numerical predictions of turbulent flow, and advocate that computational economy, range of applicability, and physical realism are best served by turbulence models in which the magnitudes of two turbulence quantities, the turbulence kinetic energy k and its dissipation rate ϵ, are calculated from transport equations solved simultaneously with those governing the mean flow behaviour.

11,866 citations

Book
01 Jan 1983
TL;DR: In this paper, the authors present basic considerations for combustion, including: 1.Basic Considerations 2.Combustion Fundamentals 3.Diffusers 4.Aerodynamics 5.Combusion Performance 6.Fuel Injection 7.Heat Transfer 8.Emissions
Abstract: 1.Basic Considerations 2.Combustion Fundamentals 3.Diffusers 4.Aerodynamics 5.Combustion Performance 6.Fuel Injection 7.Combustion Noise 8.Heat Transfer 9.Emissions

1,877 citations

Journal ArticleDOI
01 Jan 1971
TL;DR: In this paper, a method for solving the partial parabolic differential equation of turbulent flame spread has been developed, which is applied to the spread of flame behind a baffle in a plane-walled duct.
Abstract: A calculation procedure has been developed for solving the partial parabolic differential equation of turbulent flame spread. This procedure has been applied to the spread of flame behind a baffle in a plane-walled duct, with two distinct models for the kinetics of the reaction. In the first model, the time-mean reaction rate is related to the time-mean concentrations and temperature at the point in question by a bimolecular Arrhenius expression. In the second model, the local reaction rate is taken to depend also on the rate of break-up of the eddies by fits the experiemntal data better than the first; the eddy-break-up term appears to be essential if the dominance of hydrodynamic processes is to be correctly simulated. A third model of turbulent combustion is also described. It involves the calculation of the magnitude of the fluctuating concentrations, and correctly predicts themain features of turbulent diffusion flames. One of its implications is a finite reaction-zone thickness, even through there is no chemical-kinetic resistance.

686 citations