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首页> 外文期刊>Combustion Science and Technology >STRUCTURE OF FLAME NIDUS IN AN OPPOSED PARTIALLY PREMIXED FLOW WITH HEAT LOSSES
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STRUCTURE OF FLAME NIDUS IN AN OPPOSED PARTIALLY PREMIXED FLOW WITH HEAT LOSSES

机译：带有热损失的部分偏混合气流中火焰神经的结构

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摘要

The attachment and detachment of flames to cold surfaces is examined using mathematical and numerical solution methods for a simplified flame attachment/detachment problem. The flame structure considered here resembles flames near propellant surfaces, where the surface consists of alternating condensed-phase sectors of oxidizer and fuel species, which gasify and burn in the gas. The mathematical arguments originate from a constant-density flow analysis, focusing on the flow dynamics near the location on the diffusion flame (DF) arc near the cold surface where the DF ends. This location is defined as the flame nidus. Relationships are derived for the propagation speed and quenching distance of the flame (1) when it is strongly influenced by the wall and (2) when it is lifted from the wall. A criterion is produced to determine when a DF nidus is or is not attached to the surface. Numerical solutions demonstrate the validity and limitations of the simplified theoretical models by delineating the regions of applicability of theories based on a postulated premixed form of flame nidus propagation.
机译：使用数学和数值求解方法检查火焰在冷表面上的附着和分离，以简化火焰的附着/分离问题。这里考虑的火焰结构类似于推进剂表面附近的火焰，该表面由交替的氧化剂和燃料种类的冷凝相区段组成，它们在气体中气化并燃烧。数学论证源于恒定密度的流量分析，重点是靠近DF终止的冷表面附近的扩散火焰（DF）弧上的位置附近的流动动力学。该位置被定义为火焰鸟巢。得出了火焰的传播速度和熄灭距离的关系（1）当火焰受到壁的强烈影响时（2）从墙壁中升起的火焰。产生一个标准以确定DF nidus何时附着或不附着到表面。数值解通过基于假定的火焰团传播的预混合形式描绘了理论的适用范围，证明了简化的理论模型的有效性和局限性。

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