Numerical analysis of a vented methane/air explosion in a large-scale chamber

IF 5.9 Q1 ENGINEERING, MULTIDISCIPLINARY

Defence Technology(防务技术) Pub Date : 2025-10-01 DOI:10.1016/j.dt.2025.05.021

Huadao Xing , Guangan Xu , Yanyu Qiu , Song Sun , Bin Li , Mingyang Wang , Lifeng Xie

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引用次数: 0

Abstract

The internal and external flow fields during vented explosions of methane were characterized through numerical simulation, and the capability of numerical simulation thereof was validated by previous experimental data at three ignition positions. The venting mechanism was revealed by the simulated concentration distribution, temperature profile, and airflow velocity. The results show rear ignition results in the external methane mass distribution taking the form of "mushroom" and columnar flames in the external space, which can be expressed as a third-order polynomial relationship with distance; central ignition forms a relationship of the form y = Ax^B. Front ignition causes the temperature to show a tendency to repeated oscillations (rising, falling, and rising). Central ignition generates the maximum vented airflow velocity (V_max = 320 m/s) upon vent opening. The results indicate that it is acceptable to apply numerical simulation of methane explosions in practice.

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大型燃烧室甲烷/空气排气爆炸的数值分析

通过数值模拟对甲烷喷放爆炸的内外流场进行了表征，并通过已有的三个点火位置的实验数据验证了数值模拟的能力。模拟的浓度分布、温度分布和气流速度揭示了排气机理。结果表明：后点燃导致外置甲烷质量分布呈“蘑菇”状，外置空间呈柱状火焰分布，与距离呈三阶多项式关系；中心点火形成y = AxB形式的关系。前点火使温度显示出反复振荡的趋势（上升、下降和上升）。中心点火在通风口开启时产生最大排气速度（Vmax = 320 m/s）。结果表明，将数值模拟应用于实际工作中是可以接受的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Defence Technology(防务技术) Mechanical Engineering, Control and Systems Engineering, Industrial and Manufacturing Engineering

CiteScore

8.70

自引率

0.00%

发文量

728

审稿时长

25 days

期刊介绍： Defence Technology, a peer reviewed journal, is published monthly and aims to become the best international academic exchange platform for the research related to defence technology. It publishes original research papers having direct bearing on defence, with a balanced coverage on analytical, experimental, numerical simulation and applied investigations. It covers various disciplines of science, technology and engineering.