Premixed turbulent flames - Interplay of hydrodynamic and chemical phenomena
Abstract
The structure and propagation mechanism of turbulent flame fronts are considered. The most general features of the phenomenon are demonstrated on the basis of a simplified model of turbulence, characterized by a single velocity scale and a single length scale, with the additional assumption of constant density of the fluid. The results obtained are used to analyze the effects of real turbulence and the role played by gas thermal expansion. It is shown that the structure of the local reaction zones is intimately connected with the internal intermittency of turbulence and with the action of temperature increase on the small-scale eddies, while the propagation velocity of the flame as a whole is augmented by interaction of gas density inhomogeneities with large-scale eddies. The emerging picture is hardly compatible with the conventional formalisms of the statistical theory of turbulence.
- Publication:
-
Flames, Lasers, and Reactive Systems
- Pub Date:
- 1983
- Bibcode:
- 1983flrs.rept..133K
- Keywords:
-
- Flame Propagation;
- Hydrodynamics;
- Premixed Flames;
- Reaction Kinetics;
- Turbulent Flow;
- Flow Geometry;
- Flow Velocity;
- Gas Density;
- Gas Mixtures;
- Gas Temperature;
- Mathematical Models;
- Thermal Expansion;
- Fluid Mechanics and Heat Transfer