基于CFD的有害气体泄漏扩散的数值模拟

Numerical Simulation to Leakage-diffusion of Harmful Gas Based on CFD

在实验室建立系统模型的基础上，利用计算流体力学（CDF）软件Fluent对有害气体泄漏扩散过程进行了数值模拟，整个模拟计算过程的稳定性和收敛性均较好。研究结果表明：出口处的平均速度在迭代116次后达到稳定，迭代过程中的残差收敛标准为1e-5；流场中的速度分布较为明显，不同的颜色代表了不同的速度等高线，且流场中的最大速度为1．561256m／s，最小速度为0．021359m／s；获得模拟计算的最关键技术参数CO2浓度的空间分布，并与试验中的实测数据进行了对比，简单分析了产生误差的原因。研究对泄漏事故扩散趋势做出准确的预测，建立有针对性的应急救援预案，实施有效的现场控制，具有一定的科学参考价值。

In was simulated to the course of harmful gas-leakage diffusion using the software fluent based on the system model established in laboratory.The stability and convergence of the simulation were perfect,and the results showed that the average velocity in outlet came to be stable after the iteration of 116,and the convergence standard of the residual was 1e-5.The velocity distribution in flow field was obvious,and the different velocity contours.The maximum velocity in flow field was 1.561256m/s,while the minimum was 0.021359m/s.It was obtained the concentration distribution of CO2,and was compared with the data of actual measurement,then it was simply analyzed the reasons of the error.The research has a certain reference value to the prediction of trend,the construction of emergency response rescue plan and the implementation of effective field control.