The effect of pipeline structure on the flammability characteristics of hydrogen-air premixed gas under end-opening conditions

The pipe structures and opening conditions have an important influence on gas explosion, but little research has been done the coupling analysis of two. In order to reveal effect structure flammability characteristics hydrogen-air premixed under end-opening conditions, flame structure, propagation velocity, explosion pressure flow field distribution in process different were analyzed by numerical simulation. results show that velocity are less influenced initial ignition stage, however, when propagates end, each is significantly enhanced. 90? elbow a certain inhibitory development, while T-shaped bifurcation can effectively increase degree detonation. with large aspect ratio, due wall effect, acoustic oscillation disturbance front airflow release end-opening, there two peaks troughs rise rate curve pipeline structure.