Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7719953 | International Journal of Hydrogen Energy | 2014 | 11 Pages |
Abstract
A two-dimensional (2-D) simulation of spontaneous ignition of high-pressure hydrogen in a length of duct is conducted to explore ignition mechanisms. The present study adopts a 2-D rectangular duct and focuses on effects of the initial diaphragm shape on spontaneous ignition. The Navier-Stokes equations with a detailed chemical kinetics mechanism are solved in a manner of direct numerical simulation. The detailed mechanisms of spontaneous ignitions are discussed for each initial diaphragm shape. For a straight diaphragm, ignition only occurs near the wall owing to the adiabatic wall condition, while three ignition events are identified for a greatly deformed diaphragm: ignition due to reflection of leading shock wave at the wall, hydrogen penetration into shock-heated air near the wall, and deep penetration of hydrogen into shock-heated air behind the leading shock wave.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Hiroshi Terashima, Mitsuo Koshi, Chika Miwada, Toshio Mogi, Ritsu Dobashi,