湍流预混火焰中的浮力效应  

BUOYANCY EFFECTS IN PREMIXED TURBULENT FLAMES

作　　者：王岳[1] 雷宇[1] Ch Eigenbrod Y Tang 

机构地区：[1]中国科学院工程热物理研究所 [2]Universitat Bremen,D-28359 Bremen,Germany

出　　处：《工程热物理学报》2004年第3期527-530,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.50276061)

摘　　要：本文利用数值模拟研究了浮力对湍流预混V形火焰平均速度场的影响,发现浮力效应主要体现在远场区域,而在火焰刷附近非常有限;利用落塔和 OH-PLIF 方法在正常重力和微重力下观测了火焰皱褶,发现浮力压制火焰皱褶的程度与湍流强度密切相关。分析表明斜压机理是浮力影响火焰皱褶的重要原因。The buoyancy influence on the mean velocity field of premixed turbulent V-flames is studied using numerical simulation. It is found that buoyancy mainly takes effect in far-field area while the buoyancy influence near flame brushes is very limited. Flame wrinkles were observed under normal gravity and microgravity using drop tower and OH-PLIF method. The results show that the extent of buoyancy suppressing flame wrinkles is closely related to the intensity of turbulence. Analysis shows that baroclinic mechanism is important to the buoyancy influence on flame wrinkles.

关 键 词：浮力 预混火焰 数值模拟 OH-PLIF 皱褶 

分 类 号：TK16[动力工程及工程热物理—热能工程]