主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2024, Vol. 43 ›› Issue (2): 149-155.

• • 上一篇    下一篇

不同倾角斜面下滑中正庚烷的火焰特性研究

李龙基, 黄鑫   

  1. （中国民航大学 民航热灾害防控与应急重点实验室，天津 300300）
  • 出版日期:2024-02-15 发布日期:2024-02-15
  • 作者简介:李龙基（1997- ），男，山西朔州人，中国民航大学安全科学与工程学院硕士研究生，主要从事低重力运动环境下火焰行为及燃烧特性方面的研究，天津市东丽区津北公路2898号中国民航大学南校区航安楼，300300。
  • 基金资助:
    国家自然科学基金民航联合基金项目（U2133201）；天津市多元投入基金重点项目（21JCZDJC00810）

Flame characteristics of n-heptane in slope glide with different angles

Li Longji, Huang Xin   

  1. (Key Laboratory of Civil Aviation Thermal Disaster Prevention and Emergency, Civil Aviation University of China, Tianjin 300300, China)
  • Online:2024-02-15 Published:2024-02-15

摘要： 为了研究正庚烷火焰形态、火焰亮度和火焰温度在下滑过程中随时间的变化趋势，分别利用倾角为25°和40°的斜面装置开展了正庚烷在斜面下滑过程中的燃烧试验。结果表明，在两种斜面下，由于试验箱体内冷热气流因密度不同导致其惯性大小差异，使得箱体内部前后温度分布不均产生压差，在压差作用下火焰向试验箱体下滑方向倾斜；在竖直和水平两个方向加速度的综合影响下，火焰的长度缩短、倾角减小、高度降低，但亮度增强，并且斜面倾角的增加会加剧对其形态、亮度的影响，40°斜面下的火焰形态参数值分别比25°斜面的低6.21%、12.30%、6.72%，但火焰亮度比25°斜面下的高31.98%；此外，在下滑过程中正庚烷火焰因不稳定导致温度降低，40°和25°斜面下火焰温度分别降低了16.05%和22.22%。但40°斜面下的火焰温度比25°斜面下的高，这与竖直加速度减小造成的浮力效应减弱有关。

关键词: 斜面下滑, 火焰形态, 火焰亮度, 火焰温度

Abstract: In order to study the variation trend of n?heptane flame shape, flame brightness and flame temperature over time, the combustion experiments of n?heptane were carried out with the inclined plane devices of 25° and 40° respectively. The results show that under the two inclined planes, the inertia of the hot and cold air in the box is different due to the different density, which causes the uneven temperature distribution inside the box to produce pressure difference, and the flame tilts to the slide direction of the box under the action of pressure difference. Under the comprehensive influence of vertical and horizontal acceleration, the length, inclination and height of the flame are shortened, but the brightness is enhanced, and the increasing inclination of the inclined plane will have a greater impact on its shape and brightness. The flame shape parameter values at 40° inclined plane are 6.21%, 12.30% and 6.72% lower than those at 25° inclined plane, respectively. However, the flame brightness is 31.98% higher than that of 25° inclined plane. In addition, the temperature of the n?heptane flame decreased due to instability during the sliding process, and the flame temperature at 40° and 25° inclined plane decreased by 16.05% and 22.22%, respectively. However, the flame temperature at 40° inclined plane is higher than that at 25° inclined plane, which is related to the weakening of buoyancy effect caused by the decrease of vertical acceleration.

Key words: slope slide, flame morphology, flame brightness, flame temperature