管道结构对氢/空预混气体爆炸特性影响研究

为研究管道结构对氢-空预混气体爆炸特性影响,采用实验与数值模拟相结合的方法,分析不同管道结构内氢-空预混气体燃爆时火焰传播进程、爆炸压力、湍流动能变化及流场分布.结果表明:90°弯管对氢-空预混气体爆炸强度增强作用明显高于T型分岔管和直管.火焰阵面在结构突变处褶皱变形较明显,并出现大尺度强湍流和涡团,气团脉动速度与湍流...

Study on influence of pipe structure on explosion characteristics of hydrogen air premixed gas

In order to reveal the flame propagation process,change of explosion pressure,change of turbulent kinetic energy and the distribution of flow field during the explosion of hydrogen-air premixed gas in the pipes with different structures,the explosion processes of hydrogen-air premixed gas in the closed straight pipe,90° elbow pipe and T-shaped bifurcation pipe were studied by means of experiment and numerical simulation.The results showed that the enhancement effect of 90° elbow pipe on the explosion intensity of hydrogen-air premixed gas was obviously stronger than that of T-shaped bifurcation pipe and straight pipe.The flame front presented the obvious fold deformation at the location with the sudden change of pipe structure,and the large-scale strong turbulence and vortex mass appeared.The pulsation velocity of air mass and the turbulent combustion rate increased continuously,then the mass diffusion rate and heat diffusion rate of hydrogen-air premixed gas increased,and the turbulent kinetic energy showed a rapid rise trend.