Brachial burning and gasification split of a convecting two-droplet system

被引:2
作者
Chen, WH [1 ]
机构
[1] Foo Yin Inst Technol, Dept Environm Engn & Sanitat, Kaohsiung 831, Taiwan
关键词
D O I
10.1615/AtomizSpr.v12.i123.20
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Brachial burning and gasification-split characteristics of two droplets situated in a forced convection are analyzed by means of numerical method. For the given droplet size ratios of 1.5 and 0.25, it is found that a tri-brachial burning in the former and a penta-brachial burning in the latter are exhibited, where the brachial burning and gasification split are defined according to the envelope flame formation and destruction. When the droplet size ratio is large, the two droplets are always enclosed together in a flame for low Reynolds numbers. As Reynolds numbers are higher, the flame is destroyed and brought to the position behind the two droplets. Two or three gasification-split points are induced in accordance with the Reynolds number undergoing, thereby producing the tri-brachial burning. On the other hand, for a lower droplet size ratio such as 0.25, under certain conditions the flame surrounds only the trailing droplet, yielding a semienvelope flame. As a result, two extra brachial burning based on the variation of the semienvelope flame are defined, and the penta-brachial burning is obtained. Accordingly, the multiple burning states around two interactive droplets, including pure vaporization, wake flame, transition flame, envelope flame, and semienvelope flame, are established, except for the low Reynolds numbers in which only envelope flame develops. The new findings presented in the present article provide comprehensive insight for the development of droplet model in spray combustion, by intrinsically considering the variations of the Reynolds number around droplets.
引用
收藏
页码:29 / 47
页数:19
相关论文
共 22 条
[1]   Double, triple, and tetra-brachial flame structures around a pair of droplets in tandem [J].
Chen, WH ;
Jiang, TL .
COMBUSTION SCIENCE AND TECHNOLOGY, 2000, 151 (01) :105-132
[2]   Combustion hysteresis and vaporization interaction of two burning droplets with different sizes [J].
Chen, WH .
COMBUSTION SCIENCE AND TECHNOLOGY, 2000, 154 (154) :229-257
[3]  
CHEN WH, 1998, P COMBUST INST, V7, P1923
[4]  
CHEN WS, 1993, THESIS NATL CHENG KU
[5]  
Chiu HH, 1996, ATOMIZATION SPRAY, V6, P1
[6]   Multistate behavior of a droplet in dilute sprays [J].
Huang, JS ;
Chiu, HH .
ATOMIZATION AND SPRAYS, 1997, 7 (05) :479-506
[7]   DOUBLE FLAME AND MULTIPLE SOLUTION COMPUTATIONS FOR A WETTED POROUS SPHERE VAPORIZING IN REACTIVE FLOWS [J].
JIANG, TL ;
CHEN, WS ;
TSAI, MJ ;
CHU, HH .
COMBUSTION SCIENCE AND TECHNOLOGY, 1994, 102 (1-6) :115-143
[8]   CONVECTIVE FUEL DROPLET BURNING ACCOMPANIED BY AN OXIDIZER DROPLET [J].
JIANG, TL ;
LIU, CC ;
CHEN, WS .
COMBUSTION SCIENCE AND TECHNOLOGY, 1994, 97 (4-6) :271-301
[9]   A NUMERICAL INVESTIGATION OF MULTIPLE FLAME CONFIGURATIONS IN CONVECTIVE DROPLET GASIFICATION [J].
JIANG, TL ;
CHEN, WS ;
TSAI, MJ ;
CHIU, HH .
COMBUSTION AND FLAME, 1995, 103 (03) :221-238
[10]   HEAT AND MASS-TRANSFER IN COMBUSTION - FUNDAMENTAL-CONCEPTS AND ANALYTICAL TECHNIQUES [J].
LAW, CK .
PROGRESS IN ENERGY AND COMBUSTION SCIENCE, 1984, 10 (03) :295-318