Abstract
The current study is a series of experiments designed to examine the role of turbulent instabilities on the ignition process of pressurized hydrogen jets which are released into oxidizer environments. The experiments were conducted in a shock tube where hydrogen gas is shock-accelerated into a partly confined oxygen environment across a perforated plate. Although the considered scenario differs from most practical applications where high pressure hydrogen is released into air, the results may be applicable toward cases where hydrogen leaks are shock assisted through holes in fuel cell membranes. Schlieren visualization permitted the reconstruction of the gas dynamic evolution of the release while time resolved self-luminosity records permitted us to record whether ignition was achieved. Despite the presence of confinement in the experiments, the ignition limits determined experimentally were found to be relatively agreeable with trends predicted by a previously developed 1-D numerical model (Maxwell and Radulescu, 2011), which assumes a release into an unconfined environments. However, the role of confinement in the experiments not only influence ignition at lower limits compared to the 1-D ignition model, but was also found to promote turbulent mixing through shock reflections and flow instabilities. Turbulent mixing thus influences how the ignition spots interact to ignite the entire jet.
Published Version
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.