Accession Number:

ADA614585

Title:

The Response of Cryogenic H2/O2 Coaxial Jet Flames to Acoustic Disturbances (Briefing Charts)

Descriptive Note:

Briefing charts

Corporate Author:

AIR FORCE RESEARCH LAB EDWARDS AFB CA AEROSPACE SYSTEMS DIRECTORATE

Report Date:

2014-12-01

Pagination or Media Count:

32.0

Abstract:

An experimental study has been conducted at the Air Force Research LaboratoryAFRL 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 H2O2 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.

Subject Categories:

  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE