Abstract
A numerical analysis with a detail description of flow dynamics and chemical kinetics on the effect of the equivalence ratio of methane/air mixtures on the minimum ignition energy is carried out. In the early stage, the behavior of the flame kernel is dominated by a flow which is induced by the blast wave. Although a high temperature gas, which spurts out from the electrode gap, quenches, the gas at the electrode gap is self-sustained with an application of small ignition energy near the minimum. After a certain period of time, the flame kernel gradually grows out of the electrode gap. In the case of high-energy application, hot gas region, which spurts out from the electrode gap, doesn't quenches and propagatable flame kernel is formed at the early stage of spark ignition process. The local equivalence ratio at the electrode gap is larger than that in the outer region with an application of small energy although its effect is not so strong in an application of high energy. In addition, calculated profile of the minimum ignition energy as a function of the equivalence ratio for methane-air mixtures shows a minimum value below the equialence ratio of 1.0. An effect of preferential diffusion for lighter molecules is confirmed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
