Simulation of a premixed turbulent flame with the discrete vortex method

✍ Scribed by C. K. Chan; K. S. Lau; B. L. Zhang

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 170 KB
• Volume: 48
• Category: Article
• ISSN: 0029-5981
• DOI: 10.1002/(sici)1097-0207(20000610)48:4<613::aid-nme900>3.0.co;2-7

✦ Synopsis

The behaviour of a premixed turbulent ame is numerically studied in this paper. The numerical model is based on solving turbulent ow ÿeld by the discrete vortex method. The ame is considered to be of zero thickness boundary which separates burnt and unburnt regions with di erent constant density and propagates into the fresh mixture at a local curvature-dependent ame speed. The ame front is located by means of level-set algorithm. The ow turbulence is simulated through the unsteady vortex-shedding mechanism. The computed velocity ÿelds, turbulence scalar statistics as well as ame brush thickness for the turbulent V-ame are well comparable to experimental results. The computed Reynolds stresses in the ame brush region based on unconditioned velocities are substantial, but the two conditioned Reynolds stresses are negligible. These results show that the intermittency e ect is a major in uence on turbulent statistics in premixed ame and should require careful consideration in numerical models.