Numerical modelling of turbulent flow in a combustion tunnel
Abstract
A numerical technique is presented for the analysis of turbulent flow associated with combustion. The technique uses Chorin's random vortex method (rvm), an algorithm capable of tracing the action of elementary turbulent eddies and their cumulative effects without imposing any restriction upon their motion. In the past, the rvm has been used with success to treat nonreacting turbulent flows, revealing in particular the mechanics of largescale flow patterns, the socalled coherent structures. Introduced here is a flame propagation algorithm, also developed by Chorin, in conjunction with volume sources modelling the mechanical effects of the exothermic process of combustion. As an illustration of its use, the technique is applied to flow in a combustion tunnel where the flame is stabilized by a backfacing step. Solutions for both nonreacting and reacting flow fields are obtained which satisfactorily describe the essential features of turbulent combustion in a lean propaneair mixture that were observed in the laboratory by means of high speed Schlieren photography.
 Publication:

Philosophical Transactions of the Royal Society of London Series A
 Pub Date:
 March 1982
 DOI:
 10.1098/rsta.1982.0014
 Bibcode:
 1982RSPTA.304..303G
 Keywords:

 Combustion Wind Tunnels;
 Computational Fluid Dynamics;
 Flame Propagation;
 Mathematical Models;
 Numerical Flow Visualization;
 Turbulent Flow;
 Algorithms;
 Combustible Flow;
 Exothermic Reactions;
 Flow Distribution;
 Flow Geometry;
 Gas Mixtures;
 Premixed Flames;
 Propane;
 Schlieren Photography;
 Vortex Sheets;
 Vortices;
 Fluid Mechanics and Heat Transfer