Abstract
New results from experiments on propane + oxygen cool flame and two-stage ignitions in microgravity are reported. These include the occurrence of a “self-stabilized” cool flame that survives for more than 10 s, before dying away. Then, by integration of reaction–diffusion equations in a one-dimensional model, using a reduced kinetic scheme including very recent kinetic data for propylperoxy radical reactions derived by DeSain et al., simulations of these phenomena are presented and discussed. A validation of the reduced mechanism is given first, by simulation of multiple stage ignitions in closed vessels under spatially uniform conditions. The model is used to obtain a detailed spatial structure for temperature and selected chemical species during the development of cool flames, simulated with heat and mass diffusion in 1-D. Also included are novel approaches to the simulation of pressure change in a spherical vessel and the light output from CH 2O ∗ chemiluminescence. The onset and spatial growth of the cool flame, and its ability to stabilize for a reasonable interval, is traced to the interaction between the elementary reactions that govern the negative temperature coefficient of reaction rate and the temperature field that is controlled by thermal diffusion to the reaction vessel walls. The vessel surface was assumed to be chemically inactive.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
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.