Title

Reflected-shock ignition of SiH4/H-2/O-2/Ar and SiH4/CH4/O-2/Ar mixtures

Authors

Authors

E. L. Petersen; D. M. Kalitan;M. J. A. Rickard

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

J. Propul. Power

Keywords

SILANE; CHEMILUMINESCENCE; TEMPERATURES; COMBUSTION; OXIDATION; METHANE; Engineering, Aerospace

Abstract

High-temperature experiments were performed behind reflected shock waves with H-2/O-2, SiH4/H-2/O-2, CH4/O-2, and SiH4/CH4/O-2 mixtures highly diluted in argon. Reflected-shock temperatures ranged from 1000-2250 K at a pressure near 1 atm. Reaction progress was monitored by observation of the time histories of several species by the use of emission techniques, including OH*, SiH4, and CH*. The oxidation and ignition data are reported in the form of species concentration profiles and plots of characteristic times as a function of temperature. The presence of silane in the fuel/O-2 mixtures markedly reduced the ignition delay time of all H-2/O-2 and CH4/O-2 mixtures, usually by a factor of two or more, even at molar SiH4 concentrations as low as 1% of the fuel concentration. Although the decrease in ignition delay time was, in some cases, quite significant, the activation energy of ignition when plotted on an Arrhenius diagram remained virtually unchanged; this result indicates that the chain-branching behavior that takes place when silane is present, although faster and through different elementary reactions, is similar to the behavior when silane is not present. The addition of silane to H-2/O-2 mixtures also appears to extend the chain-branching kinetics to lower temperatures, eliminating the classic chain termination seen near the second explosion limit of H-2/O-2 ignition.

Journal Title

Journal of Propulsion and Power

Volume

20

Issue/Number

4

Publication Date

1-1-2004

Document Type

Article

Language

English

First Page

665

Last Page

674

WOS Identifier

WOS:000222836200009

ISSN

0748-4658

Share

COinS