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Explosion criteria for a three-step Gray and Yang, non-isothermal branching reaction scheme in fluids with natural convection

机译:自然对流流体中三步灰色和杨氏非等温分支反应方案的爆炸准则

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摘要

Explosions may occur owing to thermal and branching effects in combustion processes. The ignition limits of a system are affected by the presence of natural convection, which develops inevitably in terrestrial systems. This work investigates the explosion criterion, through parametric sensitivity, for systems with a Gray and Yang, three-step, non-isothermal branching reaction scheme with natural convection. Ignition is identified with the maximum sensitivity of the non-dimensional temperature rise (T'_(max)) to the ratio of branching and termination reaction rates (τ_b/τ_t). The effects of self-heating, branching and natural convection on the time to ignition are analysed. A value of dimensionless temperature rise T' 5 is found to be an appropriate explosion criterion for this system.
机译:由于燃烧过程中的热和分支效应,可能会发生爆炸。系统的点火极限受自然对流的影响,自然对流在地面系统中不可避免地发展。这项工作通过参数灵敏度研究了具有自然对流的Gray和Yang三步非等温支化反应方案的系统的爆炸准则。用无量纲温度升高(T'_(max))对支化和终止反应速率之比(τ_b/τ_t)的最大敏感性来识别点火。分析了自热,分支和自然对流对点火时间的影响。发现无量纲温升T'5的值是该系统的合适爆炸标准。

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