Supergravity effects on flame propagation and structure in hydrogen/air mixtures  

氢气/空气混合物中火焰传播与结构的超重力效应

作　　者：Wenkai Liang Chung K.Law 梁文恺;罗忠敬

机构地区：[1]Center for Combustion Energy,Department of Energy and Power Engineering,Tsinghua University,Beijing,100080,China [2]Department of Mechanical and Aerospace Engineering,Princeton University,Princeton,08544,USA

出　　处：《Acta Mechanica Sinica》2024年第6期31-38,共8页力学学报（英文版）

基　　金：supported by Beijing Natural Science Foundation(Grant No.3244041).

摘　　要：In the current work,we investigated hydrogen/air flame propagation under supergravity conditions.Results show that when gravity is in the same/opposite direction as flame propagation,it leads to acceleration/deceleration of the flame,and that such an effect could substantially modify the flame propagation and structure at high gravity levels.Furthermore,for the absolute and relative flame propagation speeds,the gravity-affected flame speed shows opposite trends as the absolute flame speed is more affected by the local induced flow field,while the relative flame speeds are controlled by the super-adiabatic or sub-adiabatic flame temperature.The gravity-affected thermal and chemical flame structures are also examined through the influence of the mixture equivalence ratio,pressure,and flame stretch.在当前研究中,我们探讨了超重力条件下氢气/空气火焰的传播.结果显示当重力方向与火焰传播方向相同/相反时,超重力效应会导致火焰加速/减速,这种效应在高重力水平下可以显著改变火焰传播和结构.对于火焰传播的绝对速度及相对速度,受重力影响的火焰速度显示出相反的趋势,因为绝对火焰速度更多地受到局部诱导流场的影响,而相对火焰速度则受超绝热或亚绝热火焰温度的控制.我们还通过混合物当量比、压力和火焰拉伸的影响检验了受重力影响的热-化学火焰结构.

关 键 词：SUPERGRAVITY Flame acceleration Laminar flame speed Flame stretch HYDROGEN 

分 类 号：TK16[动力工程及工程热物理—热能工程]