Effects of initial diaphragm shape on spontaneous ignition of high-pressure hydrogen in a two-dimensional duct |
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| Authors: | Hiroshi Terashima Mitsuo Koshi Chika Miwada Toshio Mogi Ritsu Dobashi |
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| Affiliation: | 1. Institute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo, Tokyo 113-8656, Japan;2. Dept. of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan |
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| 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. |
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| Keywords: | Spontaneous ignition High-pressure hydrogen Diaphragm shape CFD Detailed chemistry |
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