基于OpenFOAM的综合管廊舱内燃气泄漏扩散数值模拟

Numerical simulation of gas leakage and dispersion in utility tunnel compartment based on OpenFOAM

为实现综合管廊燃气泄漏扩散的精确高效模拟分析,进而为综合管廊燃气泄漏事故的安全防控提供技术支撑,利用OpenFOAM对城市地下综合管廊舱内燃气泄漏扩散进行数值建模计算,研究分析通风受限空间内的燃气泄漏扩散规律,并结合对应急响应时间的分析验证了通风策略的有效性。研究结果表明:气体射流作用与浮升力作用是影响综合管廊燃气泄漏扩散浓度分布的重要因素,采取合理的通风措施可有效加速燃气的流动与扩散,缩短燃气泄漏报警响应时间,有利于燃气泄漏事故应急决策与应急救援的快速实施。

In order to realize the accurate and efficient simulation and analysis of gas leakage and diffusion in the utility tunnel,and provide technical support for the safety prevention and control of gas leakage accidents in the utility tunnel,the numerical modeling and calculation of gas leakage and diffusion in the urban underground utility tunnel compartment were carried out by using OpenFOAM.The laws of gas leakage and diffusion in the confined ventilation space were studied and analyzed,then the effectiveness of ventilation strategy was verified combining with the analysis on the emergency response time.The results showed that the gas jet effect and buoyancy effect were the important factors affecting the concentration distribution of gas leakage and diffusion in the utility tunnel.Adopting the reasonable ventilation measures could effectively accelerate the flow and diffusion of gas,and shorten the alarm response time of gas leakage,which contributes to the rapid implementation of emergency decision-making and rescue of gas leakage accidents.