Premixed flames modelling

The premixed flame model and calculation procedures of Westen-berg (18) were used to estimate Idnetically limited CO oxidation for lean... 

The implicit solution approach has been used successfully for onedimensional premixed flame modeling of flames in hydrogen-bromine (Spalding and Stephenson, 1971), hydrogen-air (Stephenson and Taylor,... 

P. Clavin and G. Searby. Unsteady response of chainbranching premixed-flames to pressure waves. Combustion Theory and Modelling, 12(3) 545-567, 2008. 

T. Schuller, S. Ducruix, D. Durox, and S. Candel. Modeling tools for the prediction of premixed flame transfer functions. Proc. Combust. Inst., 29 107-113, 2002. 

Colin, O., et al., A thickened flame model for large-eddy simulations of turbulent premixed combustion. Phi/s. Fluids, 2000.12(7) 1843-1863. 

FUatyev, S.A., J.F. Driscoll, C.D. Carter, J.M. Donbar, Measured properties of turbulent premixed flames for model assessment, including burning velocities, stretch rates, and surface densities. Combust Flame, 2005. 141(1-2) 1-21. 

In Chapfer 7.2, J.H. Frank and R.S. Barlow describe the basic characteristics of non-premixed flames wifh an emphasis on fundamenfal phenomena relevant to predictive modeling. They show how the development of predictive models for complex combustion systems can be accelerated by combining closely coupled experiments and numerical simulations. 

Recall that we are assuming faem "C faff (°r fax, if turbulent flow). Anyone who has carefully observed a laminar diffusion flame - preferably one with little soot, e.g. burning a small amount of alcohol, say, in a whiskey glass of Sambucca - can perceive of a thin flame (sheet) of blue incandescence from CH radicals or some yellow from heated soot in the reaction zone. As in the premixed flame (laminar deflagration), this flame is of the order of 1 mm in thickness. A quenched candle flame produced by the insertion of a metal screen would also reveal this thin yellow (soot) luminous cup-shaped sheet of flame. Although wind or turbulence would distort and convolute this flame sheet, locally its structure would be preserved provided that faem fax. As a consequence of the fast chemical kinetics time, we can idealize the flame sheet as an infinitessimal sheet. The reaction then occurs at y = yf in our one dimensional model. 

Turbulent modeling, 11 781 Turbulent noise detectors, 11 673 Turbulent premixed flames, 7 445-446 Turf growth regulators, 13 54 Turf growth retardant, 13 57 Turkeys, nutrient requirements of, 10 842t Turmeric, 23 171 Turnaround period, 19 494 Turnarounds, industrial hygiene and, 14 210... 

In particular, premixed combustion models based on the flame surface density (Veynante and Vervisch 2002). 

Ramaekers, W.J.S. The application of flamelet generated manifolds in modeling of turbulent partially-premixed flames, MSc thesis, Eindhoven University of Technology, Eindhoven, The Netherlands, (2005). 

Kee, R. J., Great, J. F., Smooke, M. D., and Miller, J. A., A Fortran Program for Modeling Steady Laminar One-Dimensional Premixed Flames, Sandia Report, SAND85-8240, (1985). 

The detailed modeling of soot formation in the shock tube pyrolysis of acetylene [106] and other fuels [107] provides the central basis for the fuel-independent general mechanisms suggested here. It must be noted, as well, that a large body of work by Howard et al. [108, 109] on premixed flames with regard to formation of aromatic species provides direct tests of the proposed mechanisms and are key to understanding and modeling soot formation. 

Generally, the gas-phase reactions in both flame models for premixed gases and the burning of energetic materials are assumed to be bimolecular and hence of second order. Eq. (3.54) can then be expressed as... 

Part of the radiation from the reaction Zone of this flame is nonthermal, being chemiluminescent in origin. In determination of populations of species such as C2 and CH in low-pressure diffusion or premixed flames at 1-15 torr, these authors developed a simple model of a flame which reflects the characteristic requirements for start of laser action. They show that by choice of the proper experimental parameters in the model, laser action should be attainable... 

The measurements of temperature and species concentrations profiles in premixed, laminar flames play a key role in the development of detailed models of hydrocarbon combustion. Systematic comparisons are given here between a recent laminar methane-air flame model and laser measurements of temperature and species concentrations. These results are obtained by both laser Raman spectroscopy and laser fluorescence. These laser probes provide nonintrusive measurements of combustion species for combustion processes that require high spatial resolution. The measurements reported here demonstrate that the comparison between a model and the measured concentrations of CH, O2,... 

In full-scale Are modeling, a diffusion flame structure is usually assumed. However, in many fire situations, such as underventilated fires, premixed or partially premixed flame theory may be more appropriate. The Burke-Schumann description of the diffusion flames can be used to conveniently represent the transport of gaseous species by a single scalar quantity called mixture fraction. For a simple one-step reaction ... 

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