Influence of Lewis number on strain rate effects in turbulent premixed flame propagation

被引:48
作者
Chakraborty, Nilanjan
Cant, R. S. [1 ]
机构
[1] Univ Cambridge, Dept Engn, Trumpington St, Cambridge CB2 1PZ, England
[2] Univ Liverpool, Dept Engn, Liverpool L69 3GH, Merseyside, England
关键词
lewis number; tangential strain rate; displacement speed; direct numerical simulation (DNS); surface density function (SDF);
D O I
10.1016/j.ijheatmasstransfer.2005.11.025
中图分类号
O414.1 [热力学];
学科分类号
摘要
The effects of tangential strain rate on the displacement speed of turbulent premixed flames in the thin reaction zones regime are studied for three different Lewis numbers (Le = 0.8, 1.0 and 1.2) using three-dimensional compressible direct numerical simulation (DNS) of statistically planar flames. For non-unity Lewis numbers it is shown that the variations of temperature and scalar gradient in response to tangential strain rate on a given reaction progress variable isosurface have a profound influence on displacement speed behaviour. In the case of Le = 0.8, temperature and tangential strain rate are found to be positively correlated at locations of zero curvature whereas the opposite behaviour is apparent for the case of Le = 1.2. It is demonstrated that the effects of the temperature-curvature and tangential strain rate-curvature correlations are implicitly present in the response of the temperature to local strain rate. The temperature-curvature correlation and strain rate-curvature correlation are found to be in agreement with previous experimental results. Displacement speed and strain rate are found to be weakly correlated in general, but their conditional joint pdf at zero curvature locations shows a negative correlation. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2158 / 2172
页数:15
相关论文
共 35 条
[1]  
Abdel-Gayed RG, 1984, Proc Combust Inst, V20, P505
[2]  
[Anonymous], 1990, 202 TR MS NASA AM RE
[3]   NUMERICAL-SIMULATION OF TURBULENT FLAME STRUCTURE WITH NON-UNITY LEWIS NUMBER [J].
ASHURST, WT ;
PETERS, N ;
SMOOKE, MD .
COMBUSTION SCIENCE AND TECHNOLOGY, 1987, 53 (4-6) :339-375
[4]   DECAY OF TURBULENCE IN THE FINAL PERIOD [J].
BATCHELOR, GK ;
TOWNSEND, AA .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1948, 194 (1039) :527-543
[5]  
Boger M, 1998, TWENTY-SEVENTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION, VOLS 1 AND 2, P917
[6]   FLAME STRETCH AND THE BALANCE EQUATION FOR THE FLAME AREA [J].
CANDEL, SM ;
POINSOT, TJ .
COMBUSTION SCIENCE AND TECHNOLOGY, 1990, 70 (1-3) :1-15
[7]  
CANT RS, 1990, P SUMM PROGR 1990 CT, P271
[8]   Direct numerical simulation of premixed turbulent flames [J].
Cant, S .
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1999, 357 (1764) :3583-3604
[9]   Effects of strain rate and curvature on surface density function transport in turbulent premixed flames in the thin reaction zones regime [J].
Chakraborty, N ;
Cant, RS .
PHYSICS OF FLUIDS, 2005, 17 (06) :1-15
[10]   Unsteady effects of strain rate and curvature on turbulent premixed flames in an inflow-outflow configuration [J].
Chakraborty, N ;
Cant, S .
COMBUSTION AND FLAME, 2004, 137 (1-2) :129-147