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首页> 外文期刊>Combustion Science and Technology >Ignition of a Single Lubricating Oil Droplet in Combustible Ambient Gaseous Mixture under High-Temperature and High-Pressure Conditions
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Ignition of a Single Lubricating Oil Droplet in Combustible Ambient Gaseous Mixture under High-Temperature and High-Pressure Conditions

机译：在高温和高压条件下在可燃环境气体混合物中点火单个润滑油液滴

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摘要

An experimental investigation on the ignition of a single lubricating oil droplet in combustible ambient gaseous mixture was performed on a rapid compression machine, under high-temperature (1060-1090 K) and high-pressure (13.0-36.5 bar) conditions. The lubricating oil droplet was suspended on a thin quartz fiber tip in the combustion chamber. Under the conditions presented in this study, the lubricating oil droplet almost has no distinct influence on the ignition delay of the ambient gaseous mixture with an initial radius of 600 mu m due to the low evaporation rate. After the ignition of the ambient gaseous mixture, the droplet exploded severely, forming a flame ball-like soot cloud. With the increase of ambient pressure, the time for droplet explosion was advanced and the explosion get more intensive. Within the middle range of effective pressure (27-31 bar), the droplet explosion seemed to have a positive effect on the amplitude of the pressure oscillation after the autoignition of the end-gas of ambient mixture. Furthermore, the evaporation and its cooling effect of the lubricating oil droplet were investigated by a numerical method, so as to analyze the effect of the droplet size on the ignition order between the oil droplet and the ambient gaseous mixture. The results show that as for a bigger droplet, the cooling effect was more distinct and the evaporation mass ratio would be lower, which made the ignition around the droplet more difficult to occur.
机译：在高温（1060-1090 k）和高压（13.0-36.5巴）条件下，对可燃环境气体混合物中的单个润滑油液滴点火的实验研究在快速压缩机上进行。将润滑油液滴悬浮在燃烧室中的薄石英纤维尖端上。在本研究中提出的条件下，由于蒸发速率低，润滑油液滴几乎对环境气态混合物的点火延迟几乎没有不同的影响，其初始半径为600μm。在点燃环境气态混合物之后，液滴严重爆炸，形成火焰球状烟灰云。随着环境压力的增加，液滴爆炸的时间是先进的，爆炸变得更加密集。在有效压力（27-31巴）的中间范围内，液滴爆炸似乎对环境混合物的最终气体自燃后的压力振荡幅度的正效作用。此外，通过数值方法研究了润滑油液滴的蒸发及其冷却效果，从而分析了油滴与环境气态混合物之间的点火顺序的液滴尺寸的影响。结果表明，对于更大的液滴，冷却效果更明显，蒸发质量比将较低，这使得液滴周围的点火更难以发生。

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