Abstract
This study investigates the behavior of self-ignited flames caused by high-pressure hydrogen release in seamless acrylic tubes. Such flames develop in and around vortex rings generated by the release of a preceding shock wave. The combination of hydrogen, which mixes with air as it flows through the vortex rings, and a sufficiently developed self-ignited flame yields a jet flame. The experiments performed in this study investigate flame retention outside circular acrylic tubes by varying their length and the burst pressure. As observed, for tube lengths below 1000 mm, the burst pressure decreases with increase in the tube length, and a jet flame is observed outside the tube. For tubes exceeding 1000 mm in length, jet flames are observed at burst pressure exceeding 4.8 MPa. Compared to extant research, a low critical pressure is observed in this study owing to high flame temperature and low thermal conductivity of the acrylic tube.
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