Asymptotic analysis of the high-temperature ignition of CO/H2/O2 mixtures

✍ Scribed by C. Treviño; F. Solorio

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 697 KB
• Volume: 86
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(91)90108-n

✦ Synopsis

The transient process leading to ignition of a combustible mixture of carbon monoxide, hydrogen, and oxygen is studied, using both numerical techniques as well as asymptotic methods that allows us to deduce the most important regimes in the process as well as the characteristic times and the appropriate reduced kinetic mechanism involved. Two different regimes for high initial temperatures can be defined, depending on the hydrogen addition in the mixture. On one side, the ignition event is a typical chain-branching explosion for not very small hydrogen in the mixture. On the other side, a thermal explosion is obtained for very small hydrogen addition, the limit of which represents a regular limit known as dry CO. For these two regimes, an analytical expression for the ignition delay time is deduced and compared with numerical results. The case with small amount of water addition is also included.