Accession Number:

AD1038001

Title:

The Response of Cryogenic H2/O2 Coaxial Jet Flames to Acoustic Disturbances (POST PRINT)

Descriptive Note:

Conference Paper

Corporate Author:

Sierra Lobo Inc. Edwards AFB United States

Personal Author(s):

• Forliti,David J.
• Badakhshan,A.
• Wegener,Jeffrey L.
• Leyva,Ivett A.
• Talley,Douglas G.

Report Date:

2015-01-05

Pagination or Media Count:

14.0

Abstract:

An experimental study has been conducted to explore the coupling between a coaxial gaseous hydrogen liquid oxygen jet flame and transverse acoustic perturbations. A variety of chamber conditions including acoustic frequency, amplitude, and the location of the pressure node antinode with respect to the flame were examined. The flame response was documented using high-speed imaging including backlit visualization and unfiltered chemiluminescence. Dynamic mode decomposition was used to isolate the spatial structure of the flame response at the forcing frequency. The results indicate that the flame response to forcing is qualitatively similar to previous results of nonreacting coaxial jet flows the pressure node forcing appears to generate in-plane flapping of the flame while pressure antinode forcing induces a helical structure in the flame.

Descriptors:

• acoustic waves
• jet flames
• computational fluid dynamics
• combustors
• fluid mechanics
• rocket engines
• propulsion systems

Subject Categories:

• Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE