Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7724560 | International Journal of Hydrogen Energy | 2011 | 7 Pages |
Abstract
High-pressure hydrogen leak is one of the top safety issues presently. This study elucidates numerically the physics and mechanism of high-pressure hydrogen jet ignition when the hydrogen suddenly spouts into the air through a tube. The direct numerical simulation based on the compressible fluid dynamics was carried out. When high-pressure hydrogen is passing through the tube filled by atmospheric air, a strong shock wave is formed and heats up hydrogen behind the shock wave by compression effect. The leading shock wave is expanded widely after the tube exit, auto-ignitions of hydrogen occur. When the tube becomes longer, the tendency of auto-ignition is increased. Other type of auto-ignitions is also predicted. An explosion is also occurred in the tube under a certain condition. Vortices are generated behind the shock wave in a long tube. There is a possibility of an auto-ignition induced by vortices.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Eisuke Yamada, Naoki Kitabayashi, A. Koichi Hayashi, Nobuyuki Tsuboi,