Transient Radiation Properties of a Subgrid Scale Eddy

1992 ◽  
Vol 114 (1) ◽  
pp. 234-242 ◽  
Author(s):  
J. P. Gore ◽  
J. H. Jang
Keyword(s):  
Mixture Fraction ◽  
Reacting Flows ◽  
Radiative Cooling ◽  
Recent Experimental Data ◽  
Turbulent Reacting Flows ◽  
Turbulent Diffusion Flame ◽  
Total Enthalpy ◽  
Time Space ◽  
Transient Simulations ◽  
Cooling Effects

Analysis of transient radiative cooling of a strongly radiating turbulent diffusion flame is described. The specific objective is to study the possibility of including realistic radiative cooling effects in transient simulations of turbulent reacting flows. The laminar flamelet concept is used to estimate all scalar properties other than temperature and density. These are obtained from transient evolutions for total enthalpy in conjunction with the state relationships. The equation is numerically solved in the mixture fraction-time space. Results show aflame structure involving a relatively cold soot layer on the fuel-rich side consistent with recent experimental data.

Review of Large-Eddy Simulation of Non-Premixed Turbulent Combustion

2004 ◽  
Vol 128 (2) ◽  
pp. 209-215 ◽  
Author(s):  
James J. Riley
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Combustion ◽  
Mixture Fraction ◽  
Reacting Flows ◽  
Turbulent Reacting Flows ◽  
Premixed Turbulent Combustion ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Recent Developments ◽  
Potential Use

Recent developments in the methodology of large-eddy simulation applied to turbulent, reacting flows are reviewed, with specific emphasis on mixture-fraction-based approaches to nonpremixed reactions. Some typical results are presented, and the potential use of the methodology in applications and the future outlook are discussed.

Recent Advances in Measurement of Turbulent Reacting Flows in Which Heat Transfer is Dominated by Radiation

2010 ◽  
Author(s):  
G. J. Nathan ◽  
P. A. M. Kalt ◽  
Z. T. Alwahabi ◽  
B. B. Dally ◽  
P. R. Medwell ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Volume Fraction ◽  
Mixture Fraction ◽  
Soot Volume Fraction ◽  
Reacting Flows ◽  
Diagnostic Methods ◽  
Practical Significance ◽  
Turbulent Reacting Flows ◽  
Detailed Measurement ◽  
Recent Advances

Recent advances in diagnostic methods are providing new capacity for detailed measurement of turbulent, reacting flows in which heat transfer is dominant. Radiation typically becomes dominant in flames containing soot and/or with sufficient physical size, so is important in many flames of practical significance. The presence of particles, including soot, increases the coupling between the turbulence, chemistry and radiative heat transfer processes. Particles also increase the difficulties of laser-based measurements by increasing the interferences to the signal and the attenuation of the beam. The paper reviews recent advances in techniques to measure temperature, mixture fraction, soot volume fraction, velocity, particle number density and the scattered, absorbed and transmitted components of radiation propagation through particle laden systems.

On Extension of “Heatline” and “Massline” Concepts to Reacting Flows Through Use of Conserved Scalars

2002 ◽  
Vol 124 (4) ◽  
pp. 791-799 ◽  
Author(s):  
Achintya Mukhopadhyay ◽  
Xiao Qin ◽  
Suresh K. Aggarwal ◽  
Ishwar K. Puri
Keyword(s):  
Diffusion Coefficients ◽  
Reacting Flows ◽  
Scalar Transport ◽  
Zero Gravity ◽  
Two Dimensional ◽  
Total Enthalpy ◽  
Mass Fractions ◽  
New Formulation ◽  
Elemental Mass ◽  
Qualitative Picture

A new formulation for extending the concept of heatlines and masslines to reacting flows through use of conserved scalars has been proposed. The formulation takes into account the distinct diffusion coefficients of different species. Results have been obtained for a number of two-dimensional nonreacting and reacting free shear flows under normal and zero gravity. For nonreacting flows, total enthalpy and elemental mass fractions have been used as the transported conserved scalars. For reacting flows, mixture fractions, defined as normalized elemental mass fractions and enthalpy, have been employed. The results show this concept to be a useful tool for obtaining better insights into the global qualitative picture of scalar transport for both nonreacting and reacting flows.

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