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| Numerical Simulation and Safety Analysis of Fire Gas Diffusion Process |
| Received:February 17, 2019 Revised:July 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.07.013 |
| KeyWord:fire gas gaseous diffusion wind speed mountain numerical simulation turbulence model |
| Author | Institution |
| SUN Wei1 |
1. Sub-unit 41 of Unit 91550, PLA, Dalian , China |
| YANG Pei-yuan1 |
1. Sub-unit 41 of Unit 91550, PLA, Dalian , China |
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| Abstract: |
| Objective To study the process of fire gas diffusion and its impact on nearby safety. Methods A mathematical model of gas diffusion was established at the launching position by CFD method. And the RNG k-ε turbulence model was adopted for turbulence in the space to numerically simulate the diffusion process of toxic gases produced by a gas generator with FLUENT software. The diffusion process of gas at different wind speed and under different terrain influences was calculated with chlorine as the target. The effects of wind speed and mountain on the diffusion speed, distance, coverage and concentration of chlorine were analyzed. Results When fired on the top, the higher the wind speed was, the faster the diffusion rate of chlorine and the wider the coverage were. The maximum diffusion distance was 249 m. When fired at foot, at the same wind speed, the diffusion distance and diffusion speed of chlorine gas were smaller than those on the top. The maximum diffusion distance was 221 m. The influence of the mountain on the diffusion of chlorine gas was mainly to slow down the movement speed of chlorine gas group and reduce the influence distance of chlorine gas. The concentration of chlorine in the windward and leeward sides of the mountain was higher than other places. Conclusion Different wind speeds and undulating mountains have great influences on the diffusion of chlorine gas. The general rule of diffusion and influence range of toxic gases could be summarized by this analysis method. |
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