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Turbulent swirling flame prediction
6th Fluid and PlasmaDynamics Conference, 1973Finite-difference predictions are made of turbulent boundary layer swirling flames. This paper is concerned essentially with a more accurate simulation of the flow, the turbulence and reaction models. Current developments are discussed. It is demonstrated that the effect of swirl on flame size, shape, and combustion intensity may be represented by ...
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Turbulence Effects on Flame Speed and Flame Structure
AIAA Journal, 1979Turbulence effects on methane-air flames stabilized in grid turbulence were investigated through measurements of flame speed and mean and fluctuating flame temperature profiles. Published turbulent flame speed correlations were able to correlate the experimental flame speed data but were contradictory in indicating flame structure and combustion ...
K. SMITH, F. GOULDIN
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Turbulence Production in Premixed Turbulent Flames
Combustion Science and Technology, 1981Abstract —A second order closure theory developed earlier is used to study the processes influencing the turbulent velocity field in a premixed turbulent flame with degrees of heat release of practical interest. The flow field is chosen so that the time-averaged flame structure is one-dimensional and statistically stationary. Earlier work suggests that
K. N. C. BRAY +3 more
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1996
This chapter will discuss turbulent premixed flames. The distinction between pre-mixed flames and nonpremixed flames is made clear by reviewing the ideal case of each. The ideal nonpremixed flame has fast (equilibrium) chemistry that rapidly adjusts to the local mixture fraction; the mixture fraction is constantly changing.
Jürgen Warnatz +2 more
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This chapter will discuss turbulent premixed flames. The distinction between pre-mixed flames and nonpremixed flames is made clear by reviewing the ideal case of each. The ideal nonpremixed flame has fast (equilibrium) chemistry that rapidly adjusts to the local mixture fraction; the mixture fraction is constantly changing.
Jürgen Warnatz +2 more
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1996
Turbulent nonpremixed flames are of interest in practical applications. They appear in jet engines, Diesel engines, steam boilers, furnaces, and hydrogen-oxygen rocket motors. Except for the turbulent premixed combustion in many spark-ignited engines (Otto cycles), most combustion is turbulent nonpremixed.
Jürgen Warnatz +2 more
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Turbulent nonpremixed flames are of interest in practical applications. They appear in jet engines, Diesel engines, steam boilers, furnaces, and hydrogen-oxygen rocket motors. Except for the turbulent premixed combustion in many spark-ignited engines (Otto cycles), most combustion is turbulent nonpremixed.
Jürgen Warnatz +2 more
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Combustion and Flame, 1973
According to the Fourier integral theorem, a turbulent velocity field can be represented as asuperposition of plane sinusoidal shear waves of all orientations and wavelengths. The present paper is concerned with the analysis of the passage of a single representative shear wave through a plane flame front.
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According to the Fourier integral theorem, a turbulent velocity field can be represented as asuperposition of plane sinusoidal shear waves of all orientations and wavelengths. The present paper is concerned with the analysis of the passage of a single representative shear wave through a plane flame front.
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Annual Review of Fluid Mechanics, 1987
Apres un rappel des equations fondamentales, on etudie la structure des flammes du titre pour differents regimes de ...
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Apres un rappel des equations fondamentales, on etudie la structure des flammes du titre pour differents regimes de ...
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Flame length of buoyant turbulent slot flame
Proceedings of the Combustion Institute, 2019Abstract This work presents a modeling and experimental analysis on the flame length of buoyant turbulent slot diffusion flame. An approximate predictive correlation of flame length is derived based on the governing equations. The role of initial momentum and buoyancy on flame length is quantitatively described by a modified Froude number Frm.
Wei Gao +8 more
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Volume 2: Turbo Expo 2005, 2005
The present experimental study focuses on flame characteristics and turbulent flame speeds of lean premixed flames typical for stationary gas turbines. Measurements were performed in a generic combustor at a preheating temperature of 673 K, pressures up to 14.4 bars (absolute), a bulk velocity of 40 m/s, and an equivalence ratio in the range of 0.43–0 ...
P. Griebel +5 more
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The present experimental study focuses on flame characteristics and turbulent flame speeds of lean premixed flames typical for stationary gas turbines. Measurements were performed in a generic combustor at a preheating temperature of 673 K, pressures up to 14.4 bars (absolute), a bulk velocity of 40 m/s, and an equivalence ratio in the range of 0.43–0 ...
P. Griebel +5 more
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1993
Abstract : The interaction between individual vortices and a premixed laminar flame was investigated in order to characterize the underlying dynamics of flame-turbulence interactions and thereby gain an improved understanding of premixed turbulent flames.
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Abstract : The interaction between individual vortices and a premixed laminar flame was investigated in order to characterize the underlying dynamics of flame-turbulence interactions and thereby gain an improved understanding of premixed turbulent flames.
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