可控热氛围下正庚烷液滴流燃烧火焰特性研究

发布时间：2018-06-08 06:21

本文选题：超声雾化 + 正庚烷　；参考：《工程热物理学报》2016年05期

【摘要】：基于超声雾化技术,通过配比不同载气流量和燃料流量制备了四种当量比的正庚烷液滴流,利用Spraytec喷雾粒度分析仪确定其粒径分布,并在可控热氛围下对其稳态火焰特性进行了研究,分析了液滴流贯穿高度、火焰起升高度、火焰高度、火焰宽度等参数的变化规律。结果表明:液滴流燃烧时总体呈淡蓝色预混火焰,但液滴流浓度增大、热氛围温度升高时会产生暗红色尾焰;液滴流贯穿高度、火焰起升高度和火焰宽度都随热氛围温度升高而减小,而火焰高度随热氛围温度先降低后升高,且在高温区随当量比增大而升高;燃料流量增大使液滴流贯穿高度和火焰起升高度降低,使火焰宽度变小;载气流量增大使液滴流贯穿高度减小,使火焰起升高度在高温区减小,在低温区增大。
[Abstract]:Based on ultrasonic atomization technology, four n-heptane droplets with different ratios of carrier gas flow and fuel flow were prepared, and the particle size distribution was determined by Spraytec spray particle size analyzer. The steady-state flame characteristics are studied in controllable heat atmosphere, and the variation rules of the parameters such as the penetration height of droplet flow, the rising height of flame and the width of flame are analyzed. The results show that the droplet flow shows a light blue premixed flame during combustion, but when the concentration of droplet flow increases, a dark red tail flame will occur when the temperature of the hot atmosphere increases, and the droplet flow runs through the height. The rising height and width of the flame decrease with the increase of the temperature of the thermal atmosphere, while the height of the flame decreases first and then increases with the temperature of the thermal atmosphere, and increases with the increase of the equivalent ratio in the high temperature region. With the increase of fuel flow rate, the droplet flow penetration height and the flame rise height decrease, and the flame width becomes smaller, while the droplet flow penetration height decreases with the increase of the carrier gas flow rate, and the flame rise height decreases in the high temperature region and increases in the low temperature region.
【作者单位】：同济大学汽车学院;
【基金】：国家自然科学基金项目(No.51106113)
【分类号】：TK16

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