三通管不同开口状态下爆炸气流湍流变化规律

Turbulence variation law of explosion airflow in T-branch pipe with different opening states

为研究三通管不同开口状态下爆炸参数变化规律,基于数值模拟分析管内爆炸湍流动能大小、形态变化特征。研究结果表明:不同开口状态下三通管道内湍流动能峰值最大值均出现在垂直岔管内,垂直管道开口情况下管道内的最大湍动能峰值增大29.86%,水平管道开口情况下该数值降低10.12%,而两端均开口情况下,增大178.45%;管内与湍流同向传播的冲击波会加快气流速度、增大湍流动能,而逆向冲击波则会阻碍湍流的持续发展;开口工况下,火焰阵面更易接触爆炸气流携带未燃气体形成的湍流漩涡,燃爆反应与气体流动间呈现正反馈机制;爆炸气流传播至管外后,管外湍流动能随之增大,管道端口外形成双涡旋结构湍流。三通管爆炸气流湍流峰值变化及其分布规律可为工业管道支管优化布局及防爆提供依据。

In order to study the variation law of explosion parameters in the T-branch pipe with different opening states,the variation characteristics of explosive turbulent kinetic energy and shape in the pipe were analyzed based on numerical simulation.The results showed that all the maximum values of peak turbulent kinetic energy in the T-branch pipe appeared in the vertical branch pipe under different opening states.When the vertical pipe was opened,the maximum peak turbulent kinetic energy in the pipe increased by 29.86%,while when the horizontal pipe was opened,the value decreased by 10.12%,and when both ends were opened,the value increases by 178.45%.The shock wave propagating in the same direction with turbulence in the pipe would accelerate the velocity of airflow and increase the turbulent kinetic energy,while the shock wave in opposite direction would hinder the continuous development of turbulence.Under the condition of opening,the flame front contacted the turbulent vortex formed by the unburned gas carried by the explosion airflow more likely,and there existed a positive feedback mechanism between the explosion reaction and gas flow.After the explosion airflow propagated to the outside of the pipe,the turbulent kinetic energy increased accordingly,and the turbulence with double-vortex structure formed at the outside of pipe end.The variation and distribution laws of peak explosion airflow turbulence in the T-branch pipe provide basis for the layout optimization and explosion-proof of branch pipes in industrial pipeline.