基于粒子系统的地下综合管廊天然气泄漏模拟

Gas Leakage Simulation of Underground Integrated Pipe Gallery Based on Particle System

对于包含天然气管道的地下综合管廊,目前的泄漏事故风险的日常管理主要包括利用各种传感设备进行实时监测、定期检测、编制应急预案和风险评估等措施,有时还基于灾害链与故障树的推演开展不同情景下的应急演练。这些管理方法迫切需要基于燃气泄漏扩散的模型,对设定情景下的风险演化微观过程进行科学模拟与推演,在事故发展的预测预警方面缺乏过程细节与定量化的后果评估。该文运用游戏引擎Unity3D中的粒子系统模拟方法,基于一定的扩散物理模型对管廊内部的天然气泄漏与扩散过程进行模拟仿真,实现了管廊模型的搭建与粒子系统参数的设定,并通过情景参数设定实现了不同泄漏情景下管廊内泄漏天然气浓度分布的时空动态可视化。该模拟方法可为地下综合管廊中天然气泄漏事故的应急预案制定、应急演练以及应急抢险提供量化的科学依据。

For the underground integrated pipe gallery containing natural gas pipelines,the current daily management of leakage accident risk mainly includes real-time monitoring,regular detection,emergency plan preparation and risk assessment by using various sensing devices,and sometimes emergency drills under different scenarios based on the deduction of disaster chain and fault tree.These management methods urgently need to scientifically simulate and deduce the micro process of risk evolution under the set scenario based on the model of gas leakage diffusion and lack process details and quantitative consequence assessment in the prediction and early warning of accident development.We use the particle system simulation method in the game engine Unity3D to simulate the natural gas leakage and diffusion process inside the pipe gallery based on a certain diffusion physical model and realize the construction of the pipe gallery model and the setting of particle system parameters.The temporal and spatial dynamic visualization of the leakage natural gas concentration distribution in the pipe gallery under different leakage scenarios is realized by setting the scenario parameters.The simulation method can provide quantitative scientific basis for emergency plan formulation,emergency drill and emergency rescue of natural gas leakage accident in underground integrated pipe gallery.