Purpose

The purpose of this paper is to ascertain the harm to personnel and equipment caused by an external explosion during natural gas explosion venting. The external explosion characteristics induced by the indoor natural gas explosion are the focal points of the investigation.

Design/methodology/approach

Computational fluid dynamics technology was used to investigate the large-scale explosion venting process of natural gas in a 6 × 3 × 2.5 m room, and the characteristics of external explosion under different scaled vent size (K_v = A_v/V2/3, 0.05, 0.08, 0.13, 0.18) were numerically analyzed.

Findings

When K_v = 0.08, the length and duration of the explosion fireball are 13.39 and 450 ms, respectively, which significantly expands the degree and range of high-temperature hazards. The suitable flow-field structure causes the external explosion overpressure to be more than twice that indoors, i.e. the natural gas explosion venting overpressure may be considerably more hazardous in an outdoor environment than inside a room. A specific range for the K_v can promote the superposition of outdoor rupture waves and explosion shock waves, thereby creating a new overpressure hazard.

Originality/value

Little attention has been devoted to investigating systematically the external explosion hazards. Based on the numerical simulation and the analysis, the external explosion characteristics induced by the indoor large-scale gas explosion were obtained. The research results are theoretically significant for mitigating the effects of external gas explosions on personnel and equipment.

中文翻译：

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室内天然气泄爆外爆特性数值研究

目的

本文的目的是确定天然气泄爆过程中外部爆炸对人员和设备的伤害。室内天然气爆炸诱发的外爆特性是调查的重点。

设计/方法/方法

利用计算流体力学技术研究了天然气在6×3×2.5 m房间内的大规模泄爆过程，以及不同尺度泄爆尺寸(K _v = A _v /V2/3, 0.05, 0.08, 0.13, 0.18) 进行了数值分析。

发现

当K _v  = 0.08时，爆炸火球的长度和持续时间分别为13.39和450 ms，显着扩大了高温危害的程度和范围。合适的流场结构导致外部爆炸超压是室内的两倍以上，即天然气泄爆超压在室外环境中可能比室内危险得多。K _{v 的}特定范围可以促进室外破裂波和爆炸冲击波的叠加，从而产生新的超压危险。

原创性/价值

很少有人关注系统地调查外部爆炸危险。通过数值模拟和分析，得到了室内大规模瓦斯爆炸诱发的外爆特性。研究成果对于减轻外部气体爆炸对人员和设备的影响具有重要的理论意义。