The Response of Cryogenic H2/O2 Coaxial Jet Flames to Acoustic Disturbances (Briefing Charts)
Abstract
An experimental study has been conducted at the Air Force Research Laboratory(AFRL) at Edwards Air Force Base to explore the coupling between a coaxial jet flame and transverse acoustic perturbations. A new experimental facility at AFRL was used to expose a single H2/O2 shear coaxial diffusion flame to controlled acoustic resonances. A variety of chamber conditions including acoustic resonance properties were considered. The acoustic frequency and amplitude were selected relative to the characteristic frequency and dynamic pressure of the reacting injector flow. Placing the flame within the pressure node and antinode was also considered. Diagnostics employed high-speed imaging including backlit visualization and OH* chemiluminescence. The images were analyzed using proper orthogonal decomposition to identify the natural frequencies and organized structure of the unforced jet flame. These techniques were used to elucidate the effects of forcing, including the structure and relative importance of forced modes relative to the natural flame behavior.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2014
- Accession Number
- ADA614585
Entities
People
- Al Badakhshan
- David Forliti
- Douglas G. Talley
- Ivett Leyva
- Jeff Wegener
Organizations
- Air Force Research Laboratory