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A Computational Study of Extinguishment and Enhancement of Propane Cup-Burner Flames by Halon and Alternative Agents

机译：哈龙和替代剂对丙烷杯式燃烧器火焰的灭火和增强作用的计算研究

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Computations of cup-burner flames in normal gravity have been performed using propane as the fuel to reveal the combustion inhibition and enhancement by the CF3Br (halon 1301) and potential alternative fire-extinguishing agents (C2HF5, C2HF3Cl2, and C3H2F3Br). The time-dependent, two-dimensional numerical code used includes a detailed kinetic model (up to 241 species and 3918 reactions), diffusive transport, and a gray-gas radiation model. The peak reactivity spot (i.e., reaction kernel) at the flame base stabilizes a trailing flame, which is inclined inwardly by a buoyancy-induced entrainment flow. As the volume fraction of agent in the coflow increases gradually, the premixed-like reaction kernel weakens, thus inducing the flame base detachment from the burner rim and blowoff-type extinguishment eventually. The two-zone flame structure (with two heat-release-rate peaks) is formed in the trailing diffusion flame. The H2O formed in the inner zone is converted further, primarily in the outer zone, to HF and CF2O through exothermic reactions most significantly with the C2HF5 addition. The total heat release of the entire flame decreases (inhibiting) for CF3Br but increases (enhancing) for the halon alternative agents, particularly C2HF5 and C2HF3Cl2. Addition of C2HF5 results in unusual (non-chain branching) reactions.
机译：已经使用丙烷作为燃料进行了在正常重力下的杯形燃烧器火焰的计算，以显示CF3Br（哈龙1301）和潜在的替代灭火剂（C2HF5，C2HF3Cl2和C3H2F3Br）对燃烧的抑制和增强作用。所使用的随时间变化的二维数字代码包括详细的动力学模型（多达241种和3918个反应），扩散传输和灰气体辐射模型。火焰底部的峰值反应点（即反应核）稳定了随行的火焰，该火焰随浮力引起的夹带流向内倾斜。随着顺流中试剂体积分数的逐渐增加，预混合样反应核减弱，从而导致火焰基部从燃烧器边缘脱离，并最终导致喷出式熄灭。在尾随扩散火焰中形成两区火焰结构（具有两个放热率峰值）。在内部区域中形成的H2O主要是在外部区域中，通过添加C2HF5的放热反应而进一步转化为HF和CF2O。整个火焰的总热量释放对CF3Br减少（抑制），但对哈龙替代剂（特别是C2HF5和C 2 HF 3 Cl ）增加（增强） 2 。 C 2 HF 5 的添加会导致异常反应（非链支化）。

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