Laser ignition on single droplet characteristics of aviation kerosene at different pressures and initial diameters: ignition, combustion and micro-explosion

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Yang Yi , Senlin Lv , Erjiang Hu , Geyuan Yin , Yingjia Zhang , Zuohua Huang , Yingwen Yan
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Abstract

In this study, an experimental system for single-droplet ignition by laser under different pressures is established, and the laser ignition is used to examine how pressure and initial diameter influence ignition properties of RP-3 aviation kerosene single-droplet. The findings reveal that depending on the extent of the impact of bubble rupture on the droplet's shape, The droplet's morphological alterations can be classified into three types: micro-expansion, puffing, and micro-explosion. The ignition and combustion of droplets is segmented into four distinct phases: heating, ignition, intense combustion, boiling combustion. The flame width diminishes with rising pressure. Single droplet ignition delay time is strongly influenced by the pressure, which is reduced by 92.7 %, 94.1 % and 94.3 % for the three droplets from small to large diameters with the pressure increases from 1 bar to 4 bar. The change trends of droplet diameters are first increasing and then decreasing. The whole burning rate of RP-3 droplets goes up with the rise of pressure. A droplet laser ignition model is proposed, the minimum ignition energy of RP-3 droplets with an initial diameter of 1.42 mm at pressures of 1–4 bar are obtained to be 0.88 J, 0.80 J, 0.68 J, and 0.59 J, respectively.

Abstract Image

不同压力和初始直径下航空煤油单液滴特性的激光点火:点火、燃烧和微爆炸
本研究建立了不同压力下激光点燃单液滴的实验系统,并利用激光点燃来研究压力和初始直径如何影响 RP-3 航空煤油单液滴的点燃特性。研究结果表明,根据气泡破裂对液滴形状的影响程度,液滴的形态变化可分为微膨胀、膨化和微爆炸三种类型。液滴的点火和燃烧分为四个不同阶段:加热、点火、剧烈燃烧和沸腾燃烧。火焰宽度随压力升高而减小。单液滴点火延迟时间受压力的影响很大,当压力从 1 巴增加到 4 巴时,小直径液滴到大直径液滴的点火延迟时间分别缩短了 92.7%、94.1% 和 94.3%。液滴直径的变化趋势是先增大后减小。随着压力的升高,RP-3 液滴的整体燃烧率也随之升高。提出了液滴激光点火模型,得到了初始直径为 1.42 mm 的 RP-3 液滴在 1-4 bar 压力下的最小点火能量分别为 0.88 J、0.80 J、0.68 J 和 0.59 J。
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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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