Experimental investigation on droplet evaporation characteristics during combustion of future and current aviation fuels with range of properties

L. Zheng, C. Wei, Y. Zhang, B. Khandelwal
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Abstract

Currently there is lack of knowledge on how new types of alternative fuels and their storage conditions change the droplet evaporation characteristics. Liquid fuel is commonly stored in wide varieties of containers, where fuel characteristics may change because of the exposure to the material of the container. This study evaluates the impact of different storage containers on droplet evaporation characteristics of different fuels. It was found that there is a distinct phase transition between high volatility to low volatility phase in each fuel stored in steel drums verses fuel that is stored in plastic drums. The type of fuel contaminated by polymer additive has a high impact on fuel droplet burn rates. Polymer additives also have an impact on nucleate boiling, sub-droplets and soot particles. The burning rate constant, K, of selected pure aromatics, various fuel mixtures and Jet A with different cetane numbers have been evaluated. Research has shown that in the low volatility combustion phase a trend reduction of lowest boiling point pure aromatic burning rate to the highest boiling point pure aromatic burning rate is obvious. Irregular change in droplet diameter between the high volatility phase and low volatility phase during the combustion of aromatics blend was observed. This work has also evaluated the relationship between burning rates and cetane numbers.
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未来和现有不同性能航空燃料燃烧过程中液滴蒸发特性的实验研究
目前,关于新型替代燃料及其储存条件如何改变液滴蒸发特性的知识缺乏。液体燃料通常储存在各种各样的容器中,其中燃料的特性可能会因为暴露于容器的材料而发生变化。本研究评估了不同储存容器对不同燃料液滴蒸发特性的影响。研究发现,钢桶中储存的燃料与塑料桶中储存的燃料之间存在明显的高挥发性相到低挥发性相的相变。受聚合物添加剂污染的燃料类型对燃料液滴燃烧速率有很大影响。聚合物添加剂对成核沸腾、亚滴和烟灰颗粒也有影响。对选定的纯芳烃、各种燃料混合物和不同十六烷数的射流A的燃烧速率常数K进行了计算。研究表明,在低挥发性燃烧阶段,最低沸点纯芳烃燃烧速率向最高沸点纯芳烃燃烧速率明显降低的趋势。研究了芳烃共混物燃烧过程中高挥发相和低挥发相液滴直径的不规则变化规律。这项工作还评估了燃烧速率和十六烷数之间的关系。
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