文章摘要
超低压量程下的可燃气体燃烧特性研究
Study on combustion characteristics of combustible gas at an ultra-low pressure range
投稿时间:2022-02-19  修订日期:2022-02-19
DOI:
中文关键词: 超低压量程  匀速变压 气体火  火行为特性  火焰温度  热辐射通量
英文关键词: ultra-low pressure range  Uniform speed variable pressure gas fire  Fire behavior characteristics  Flame temperature  Heat flux
基金项目:火灾科学国家重点实验室开放课题项目(No.HZ2020-KF01),安徽建筑大学引进人才项目(No.2019QDZ21)
作者单位邮编
丁超 安徽建筑大学 230601
兰清源 安徽建筑大学 
李锁 安徽建筑大学 
朱难难 中国科学技术大学 
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中文摘要:
      试验研究了超低压环境对甲烷扩散火焰特性的影响,试验是基于3m×2m×2m变气压变氧浓度试验舱完成的,试验舱的压力可从标准大气压101.6kPa以恒定速率降低到设定压力13kPa,通过改变降压速率及升压速率来控制环境压力的线性变化。研究甲烷燃料在匀速动态的环境压力变化下的扩散火焰特性(火焰温度、热辐射通量、火焰形状)。同时,验证对羽流火焰温度及火焰高度等经典模型在超低压量程及大流量气体火下的预测情况,并进行了修正。试验表明:在超低压下,羽流火焰温度与环境压力的-2/3的正相关性减弱,火焰高度在更大的流量以及更低的压力下,其变化趋势已无法满足前人的预测模型。同时,在动态的压力变化下,甲烷火焰的热辐射通量与环境压力呈正相关变化。
英文摘要:
      This experiment studies the influence of ultra-low pressure environment on the characteristics of methane diffusion flame. The experiment is based on the 3m×2m×2m variable pressure and oxygen concentration test chamber. The pressure of the test chamber can be reduced from standard atmospheric pressure 101.6kpa at a constant rate to the set pressure 13kPa, and the linear change of environmental pressure can be controlled by changing the step-down rate and pressure-boost rate. The diffusion flame characteristics (flame temperature, heat flux and flame shape) of methane fuel under uniform and dynamic ambient pressure were studied. At the same time, the classical models of flame plume temperature and flame height were verified and modified under the conditions of ultra-low pressure range and large flow gas fire. The results show that the positive correlation between the flame plume temperature and the ambient pressure of -2/3 weakens under ultra-low pressure, and the flame height can no longer meet the previous prediction model under higher flow and lower pressure. At the same time, the heat flux of methane flame is positively correlated with the ambient pressure under the dynamic pressure change.
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