摘要
在火焰和流动相互作用中，浮力是火焰影响流场的因素致一。研究浮力的作用有助于深入了解湍流燃烧的机理。本文利用甲烷－空气预混Ｖ形火焰研究浮力的作用。分析表明浮力不仅影响火焰的平均位置，还可能影响火焰的皱折。在１ｇｏ和μｇ下用ＯＨ－ＰＬＩＦ观测火焰，发现层流和湍流火焰呈现相反的浮力效应，这表明浮力确实影响火焰的皱折。另外，层流火焰锋面在μｇ下明显折皱，这意味着微重力也适于研究火焰中其他诱发流动的机制。
Flame-flow interaction is crucial to turbulent combustion. The flame-generated flow is related to how a flame changes the flow field. Buoyancy will induce flow in flames. To study how buoyancy influences flames will lead to better understanding on flame-flow interaction. CH4-Air premixed V-flames were studied in 1go and μg experiments to observe buoyancy effects. In addition, the mechanism of buoyancy influence was analyzed theoretically. OH-PLIF was used in both 1go and μg experiments to detect flame fronts. The results show that the buoyancy effect on the laminar flame differs form that on the turbulent flame. This suggests the existence of the buoyancy influence on flame wrinkling and the coupling between buoyancy and coming flow. Another observation is that the laminar flame exhibited wrinkles in μg and this implies that μg is also suitable to the study of other mechanisms inducing flow in flames.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2001年第3期382-385,共4页
Journal of Engineering Thermophysics
基金
德国航天局(DLR)基金资助项目(No.50 WF 9999)
