瓦斯浓度对瓦斯爆炸影响的数值模拟研究

Numerical Simulation Study on Effect of Gas Concentration upon Gas Explosion

采用流体动力学软件Fluent,对方形管道内体积分数分别为7.5%,9.5%,11.5%的瓦斯气体爆炸过程进行数值模拟研究,分析其爆炸过程中的压力、温度和火焰传播速度。结果表明:在3种不同浓度的瓦斯气体爆炸过程中,火焰的传播趋势大致相同,但火焰传播速度、管道内的超压以及温度有较大的区别;体积分数为9.5%的瓦斯气体爆炸过程中火焰传播速度、超压和温度均最大。模拟结果与前人的实验结果吻合。

Numerical simulation study on the explosion process of gas with concentration of 7.5%,9.5% and 11.5% respectively in a square pipe was carried out by using the computational fluid dynamics(CFD) software Fluent,and analysis was made on the changes of pressure,temperature and the flame propagation speed in the explosion process.The results showed that the trend of flame propagation was roughly same in the explosion process of gas with three different concentrations,but the flame propagation speed,the pressure and temperature in the pipe were largely different.In addition,the flame propagation speed was faster than others and the pressure and temperature were the biggest in the explosion process of gas with concentration of 9.5%.The simulation results are consistent with the previous experimental ones.