浮力对V型火焰张角的影响

EFFECT OF BUOYANCY ON LAMINAR V-SHAPED PREMIXED FLAME ANGLE

浮力对Ｖ型火焰张角的影响张孝谦，杨平，封灵芝，韦明罡，孙秀婵（中国科学院工程热物理研究所北京１０００８０）田宗漱（中科院研究生院北京１０００３９）关键词微重力燃烧，Ｖ型火焰，浮力的影响本文给出在中科院工程热物理所２秒落塔设备上进行的浮力对预混层流Ｖ型...

A study of the effect of buoyancy on laminar V-shaped premixed flame angle has been conducted experimentally.The experiments were performed in a 2-second drop tower located in the IET,CAS.The microgravity level is about 10-4g.V-shaped flame is an ideal flame configuration for this study.The flamefront can be treated as a structureless density discontinuity and the effects of buoyancy on flamefront can be fully developed.Methane-air mixtures were used in this study.In the experiments the equivalence ratio was changed to get different temperature variations between fresh combustible gas and burned products.Then the effects of buoyancy were changed.The structureless flamefront was no longer subjected to the action of buoyancy in microgravity(μg). So,the V-shaped flamefronts would be more open.Experiment results verified it.The changes of flame angle mostly depend on the temperature,i.e.the density,differences.These experiment results might give rise to a revision of flame propagation speed measuxed by using V-shaped flame in 1g.