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针对隧道内运输危险品(天然气)车辆在行驶过程中发生小孔泄漏导致天然气扩散的情况,基于事故性泄漏动力学、流体动力学理论对泄漏气流的传播特性进行了分析,建立了基于Fluent的天然气扩散物理数学模型。模型采用基于雷诺时均方程和及标准k-ε方程的湍流模拟,用SIMPLEC算法对N-S方程进行求解,并采用组分输运来解决多组分流体的扩散问题。仿真采用瞬态计算,模拟气流在不同的泄漏时间内的扩散现象,同时考虑实际情况分别模拟了扩散场地有障碍物与无障碍物的天然气泄漏扩散情况以及隧道进风口风速大小对于气流扩散的影响,为隧道内车辆运输危险品泄漏事故的抢救及最大限度地减少损失提供了参考。
According to the accidental leakage dynamics and hydrodynamics theory, the propagation characteristics of the leakage air flow are analyzed based on the leakage of small holes caused by the leakage of small holes during the driving process of the vehicles transporting dangerous goods (natural gas) in the tunnel. A Fluent-based Natural gas diffusion physics mathematical model. The model uses turbulent simulation based on Reynolds averaged equations and standard k-ε equations. The SIMPLEC algorithm is used to solve the N-S equation and component transport is used to solve the problem of multi-component fluid diffusion. The simulation uses transient calculation to simulate the diffusion phenomenon of gas flow in different leakage time. At the same time, the natural gas leakage and diffusion with and without obstacle at diffusion site and the influence of wind speed at tunnel inlet on airflow diffusion are simulated respectively , Which provides a reference for the rescue of leakage accidents of dangerous goods transported by vehicles in the tunnel and the minimization of losses.