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首页> 外文期刊>Combustion and Flame >The extinction limits of a hydrogen counterflow diffusion flame above liquid oxygen
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The extinction limits of a hydrogen counterflow diffusion flame above liquid oxygen

机译：液态氧上方氢逆流扩散火焰的消光极限

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摘要

A counterflow diffusion flame between gaseous hydrogen and liquid oxygen (LOx) is studied numerically at 1 and 2 bar pressures. Conditions at the liquid interface are modelled using the Clausius-Clapeyron relation and the species profiles are evaluated with a one-dimensional numerical code. Complex chemistry and multicomponent transport are employed. Thermodynamic and transport properties are taken from Chemkin and the corresponding Transport packages. Typical species and temperature profiles are presented. The extinction strain rate is evaluated as a function of the inlet hydrogen temperature. This varies from 1.2 X 10~5 s~(-1) at a hydrogen temperature of 20K to 6.0 X 10~5 s~(-1) at a temperature of 310K, indicating that hydrogen/LOx flames are extremely resistant to strain rate. The effect of the temperature gradient on the liquid side of the interface is examined and found to be negligible. When applied to one aspect of the flame-holding in cryogenic rocket motors, these results may be used to infer that extinction by strain rate is improbable in the injector near-field, even for very low hydrogen stream temperatures.
机译：在1 bar和2 bar的压力下，对气态氢与液态氧（LOx）之间的逆流扩散火焰进行了数值研究。使用Clausius-Clapeyron关系对液体界面的条件进行建模，并使用一维数字代码评估物种分布。采用了复杂的化学反应和多组分运输。热力学和运输性质取自Chemkin和相应的运输包装。介绍了典型的物种和温度曲线。评估消光应变速率与入口氢气温度的关系。在氢气温度为20K时从1.2 X 10〜5 s〜（-1）到温度在310K时为6.0 X 10〜5 s〜（-1），这表明氢气/ LOx火焰对应变率具有极强的抵抗力。检查了温度梯度对界面液体侧的影响，并且可以忽略不计。当应用于低温火箭发动机的火焰保持的一个方面时，这些结果可用于推断即使在非常低的氢气流温度下，在喷射器近场中也不可能因应变率而熄灭。

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