管道内湍流火焰发展与加速特性分析

doi:10.16265/j.cnki.issn1003-3033.2025.S1.0030

中国安全科学学报 ›› 2025, Vol. 35 ›› Issue (S1): 199-204.doi: 10.16265/j.cnki.issn1003-3033.2025.S1.0030

管道内湍流火焰发展与加速特性分析

李帅东(), 张健^**()

清华大学航天航空学院, 北京 100084

收稿日期:2025-02-03 修回日期:2025-04-10 出版日期:2025-09-03
通信作者:
^** 张健(1963—),男,河北辛集人,博士,教授,主要从事湍流多相流动与燃烧等方面的研究。E-mail:jianzhang@mail.tsinghua.edu.cn。
作者简介:
李帅东 (1997—),男,陕西西安人,博士研究生,研究方向为湍流燃烧等。E-mail: li-sd22@mails.tsinghua.edu.cn。
基金资助:
国家自然科学基金资助(91541206)

Analysis of turbulent flame development and acceleration characteristics in a tube

LI Shuaidong(), ZHANG Jian^**()

School of Aerospace Engineering, Tsinghua University, Beijing 100084, China

Received:2025-02-03 Revised:2025-04-10 Published:2025-09-03

摘要/Abstract

摘要： 为降低煤矿管道火灾事故发生的概率,探索抑制火焰加速诱发灾害的途径,分析管道内火焰发展与加速的主要特性,采用代数二阶矩-概率密度函数湍流燃烧模型,构建描述管内湍流火焰发展与加速的理论模型,并利用数值模拟研究甲烷-空气混合气在一端封闭、一端开口的燃烧管内的火焰发展与加速过程。结果表明:在管内中心线上,气体温度与燃料浓度梯度较大的火焰面即反应区,湍流平均反应率也较高;反应区出现气体轴向速度的跃升,同时出现湍能分布的峰值;气体平均反应率受湍流影响;反应区内湍流的逐渐增强导致反应区范围逐渐扩大,从而促进火焰加速。

关键词: 湍流火焰, 火焰发展, 火焰加速, 燃烧管, 预混气体

Abstract:

In order to reduce the probability of fire accidents in coal mine pipelines and explore ways to inhibit the acceleration of flames that trigger disasters, the main characteristics of flame development and acceleration within the pipeline were analyzed. The algebraic second-order moment-probability density function-based turbulent combustion model was sought to build a theoretical model that describes the development and acceleration of a turbulent flame in a tube. Numerical simulations were adopted to study the development and acceleration of flames induced by methane and air mixture in a combustion tube with one end closed and the other open. The results show that in the center line of the tube, the flame surface with higher gradients of gas temperature and gradient of fuel concentration is the reaction zone, and the averaged turbulence reaction rate is higher; there is a jump in the gas axial velocity in the reaction zone, and at the same time, a peak in the turbulent kinetic energy distribution appears; the averaged gas reaction rate is affected by turbulence; the gradual increase in turbulence in the reaction zone leads to the gradual expansion of the reaction zone, thereby promoting the acceleration of the flame.

Key words: turbulent flame, flame development, flame acceleration, combustion tube, premixed gas

中图分类号:

X932爆炸安全与防火、防爆

李帅东, 张健. 管道内湍流火焰发展与加速特性分析[J]. 中国安全科学学报, 2025, 35(S1): 199-204.

LI Shuaidong, ZHANG Jian. Analysis of turbulent flame development and acceleration characteristics in a tube[J]. China Safety Science Journal, 2025, 35(S1): 199-204.

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管道内湍流火焰发展与加速特性分析

Analysis of turbulent flame development and acceleration characteristics in a tube

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