Self Ignition Phenomena of High Pressure Hydrogen Released into Tube with Diaphragm Rupture Conditions

Abstract

High combustion efficiency of hydrogen could make it an ideal source of green energy in the future. At this time, high pressure vessel is the most reasonable method of storing hydrogen. However, such a high pressurized vessel could pose a critical threat if ruptured. For this reason, it is important to understand the mechanism of hydrogens self-ignition when a high-pressure hydrogen is released into air. This paper presents several visualization images as experimental results using a high-speed camera. From the visualization images, the ignition is initiated near the rupture disk immediately after failure of the disk. And the early ignition and flame is stronger as a rupture pressure increases. However, this ignition region does not affect the general self-ignition mechanism when high-pressure hydrogen is released into the air through tube after failure of disk.