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Ignition and Extinction of Non-Premixed Flames of Single-Component Liquid Hydrocarbons, Jet Fuels and their Surrogates

机译:单组分液体烃,喷射燃料及其代理的非预混火焰的点火和灭火

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Compared to gaseous fuels, notably fewer fundamental flame data exist for practical jet fuels. Such fuels require precision and rather complex control in order to be introduced into the gas phase without changing the fuels' composition. Additionally, the modeling of their kinetics is a daunting task given the wide range of heavy and complex hydrocarbons that they contain. On the other hand, the under standing of the burning characteristics of jet fuels is of significant importance for air-breathing propulsion. The development of reliable surrogate fuels that mimic the behavior of the real fuels is a promising approach towards the development of kinetics mechanisms that can be eventually used in LES simulations of combustors. In the present study, extinction strain rates and ignition temperatures of a wide range of jet fuels were experimentally determined in the counter flow configuration under non-premixed conditions. Similar measurements were also made for single-component hydrocarbon fuels and surrogate fuels and were compared with those obtained for the jet fuels. The experiments were conducted at atmospheric pressure and elevated temperatures. For single-component hydrocarbon fuels, fuels with lower carbon number were found to be more resistant to extinction and have greater ignition propensity. The results for the jet fuels revealed that there is a large variation in both extinction and ignition limits. Jet fuels with similar extinction behavior were found to exhibit a rather different ignition response. Two recently proposed JP-8 surrogates were also tested, and both the ignition and extinction states of a reference JP-8 fuel were not predicted satisfactorily. Both surrogates were found to exhibit a more robust combustion behavior compared to JP-8, as manifested by their increased ignition propensity and their increased resistance to extinction.
机译:与气体燃料相比,实际喷射燃料存在较少的基本火焰数据。这种燃料需要精确且相当复杂的控制,以便在不改变燃料组合物的情况下引入气相。此外,鉴于它们所包含的繁重和复杂的碳氢化合物的广泛繁重和复杂的碳氢化合物,它们的动力学建模是一种艰巨的任务。另一方面,在喷射燃料的燃烧特性的抗燃烧特性方面具有重要意义,可对空气呼吸推进性重视。可靠的代理燃料的发展,模仿真正的燃料行为是发展动力学机制的有希望的方法,这些机制最终可以用于燃烧器的LES模拟。在本研究中,在非预混合条件下,在计数器流动配置中实验确定宽范围喷射燃料的消光应变速率和点火温度。对于单组分烃燃料和替代燃料,还具有类似的测量,并与喷射燃料获得的那些进行比较。实验在大气压和升高的温度下进行。对于单组分烃燃料,发现具有较低碳数的燃料更耐消光并具有更大的点火倾向。喷射燃料的结果揭示了灭绝和点火限制的巨大变化。发现具有相似消灭行为的喷射燃料表现出相当不同的点火响应。还测试了最近提出的JP-8替代物,并令人满意地预测了参考JP-8燃料的点火和消除状态。与JP-8相比,发现两种替代品都表现出更强大的燃烧行为,如它们增加的点火倾向和抗灭绝的抗性增加。

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