On the Structure and Morphology of Turbulent Premixed Flames
Turbulent combustion occurs in a majority of industrial devices. Many prediction methods have been proposed in recent years, and at the same time much experimental investigation has been performed. However, the physical structure of turbulent flames cannot be regarded as completely understood at present due to the complexity of the relevant experimentation.
This study aims at a synthesis between experimental findings and theoretical reasonings concerning the problem. A brief survey of previous discussions is presented first, with emphasis on three points around which controversy has been concentrated. The morphology of turbulent premixed flames in different conditions is described following a theoretical point of view; the presentation here synthesizes the discussions of earlier workers from different countries and different periods. The result is a comprehensive classification of turbulent premixed flames. The theoretical description is then compared with available experimental observations of the detailed structure of turbulent flames. Good agreement is achieved; however, experiments are very few and more research is required in this direction.
KeywordsTurbulence Kinetic Energy Equivalence Ratio Engine Speed Flame Front Lewis Number
Unable to display preview. Download preview PDF.
- 1.M. Summerfield, S. H. Reiter, V. Kebely, and R. W. Mascolo, The structure and propagation mechanism of turbulent flames in high speed flow, Jet Propulsion 25, 377–384 (1955).Google Scholar
- 2.K. I. Schelkin, Combustion hydrodynamics, Fiz. Goreniya Vzryva 4, 455–468 (1968).Google Scholar
- 4.V. L. Zimont, Theory of turbulent combustion of a homogeneous fuel mixture at high Reynolds numbers, Fiz. Goreniya Vzryva 15, 23–32 (1979).Google Scholar
- 6.F. A. Williams, A review of some theoretical considerations of turbulent flame structure, in: AGARD Conf. Proc. no. 164, on: Analytical and numerical methods for investigation of flows fields with chemical reactions, especially related to combustion, Liège (1974).Google Scholar
- 7.B. Karlovitz, J. R. Denniston, D. H. Knapschaefer, and F. E. Wells, Studies on turbulent flames, in: Fourth Symp. (Int.) on Combust., pp. 613–635, The Williams and Wilkins Co., Baltimore (1953).Google Scholar
- 8.R. Borghi and E. Pourbaix, On the coupling of complex chemistry with a turbulent combustion model, Physicochemical Hydrodynamics 2, 65–71 (1981).Google Scholar
- 9.V. N. Lebedev and A. M. Klimov, Elongation of a non-adiabatic flame during combustion of mixed gases and volatile explosive, Fiz. Goreniya Vzryva 17, 68–73 (1981).Google Scholar
- 14.R. Borghi, Turbulent premixed combustion: further discussions on the scales of fluctuations, Paper presented at the 9th International Colloquium on Dynamics of Explosions and Reactive Systems, Poitiers, France (3–8 July, 1983).Google Scholar
- 15.R. Borghi and D. Dutoya, On the scales of the fluctuations in turbulent combustion, in: Seventeenth Symp. (Int.) on Combust., pp. 235–244, The Combustion Institute, Pittsburgh, PA (1978).Google Scholar
- 16.P. Moreau and A. Boutier, Laser velocimeter measurements in a turbulent flame, in: Sixteenth Symp. (Int.) on Combust., pp. 17–47, The Combustion Institute, Pittsburgh, PA (1977).Google Scholar
- 18.A. R. Ganji and R. F. Sawyer, An experimental study of flow field and pollutant formation in a two dimensional, premixed, turbulent flame, AIAA Paper 79-0017 (1979).Google Scholar
- 21.J. C. Bellet, M. Champion, Y. Chauveau, and J. Merlin, Expériences sur la combustion d’un hydrocarbure stabilisé par un mélange de gaz brûlés avec les gaz frais, C. R. Hebd. Séances Acad. Sci. de France 293, série II, 259–263 (1981).Google Scholar
- 22.Y. Chauveau, P. Cambray, M. Champion, and J. C. Bellet, Experimental study and modelling of the reactive flow in a constant section reactor, Physicochemical Hydrodynamics 4, 231–242 (1983).Google Scholar
- 23.J. R. Smith, Turbulent flame structure in a homogeneous-charge engine, SAE Paper 820043 (1982).Google Scholar
- 24.A. C. Scurlock and J. H. Grover, Propagation of turbulent flames, in: Fourth Symp. (Int.) on Combust., pp. 645–658, The Williams and Wilkins Co., Baltimore (1953).Google Scholar