Solid Propellant Flame Structure

1995 ◽  
Vol 418 ◽  
Author(s):  
T. P. Parr ◽  
D. M. Hanson-Parr
Keyword(s):  
Spatial Resolution ◽  
Solid Propellant ◽  
Diffusion Flames ◽  
Flame Structure ◽  
Laser Induced Fluorescence ◽  
Flame Length ◽  
Dark Zone ◽  
Planar Laser ◽  
Burn Rate ◽  
Laser Flux

AbstractPlanar Laser Induced Fluorescence (PLIF), UV/Vis Absorption, and thermocouple measurements were done for HNF, RDX, HMX, and XM39 deflagration with and without CO2 laser-support. RDX and especially HNF have very short self-deflagration flame length scales. HMX and XM39 have taller self-deflagration flames. XM39 has a marked dark zone with plateau temperature about 1400K. RDX's dark zone, present under laser supported deflagration, collapses when the external laser flux is removed. PLIF was used to measure the 2D NH, OH, and CN species profiles for these materials and OH temperature profile for RDX and HNF under non-laser supported conditions. The best spatial resolution for the RDX PLIF was about 4μm. Sandwiches of HNF and various binders were studied with PLIF and while obvious diffusion flames were present at low pressure, they are weak and are not expected to be burn rate controlling.

Combustion Structures in Lifted Ethanol Spray Flames

2004 ◽  
Vol 126 (2) ◽  
pp. 254-257 ◽  
Author(s):  
Stephen K. Marley ◽  
Eric J. Welle ◽  
Kevin M. Lyons
Keyword(s):  
Reaction Zone ◽  
Flame Structure ◽  
Leading Edge ◽  
Laser Induced Fluorescence ◽  
Premixed Combustion ◽  
Diffusion Mode ◽  
Spray Flames ◽  
Partially Premixed Combustion ◽  
Planar Laser ◽  
Single Reaction

The development of a double flame structure in lifted ethanol spray flames is visualized using OH planar laser-induced fluorescence (PLIF). While the OH images indicate a single reaction zone exists without co-flow, the addition of low-speed co-flow facilitates the formation of a double flame structure that consists of two diverging flame fronts originating at the leading edge of the reaction zone. The outer reaction zone burns steadily in a diffusion mode, and the strained inner flame structure is characterized by both diffusion and partially premixed combustion exhibiting local extinction and re-ignition events.

Analysis of flame structure by isotope shift-planar laser induced fluorescence spectrometry of trace OH and OD Radicals

2013 ◽  
Vol 106 ◽  
pp. 334-339 ◽  
Author(s):  
Tsuyoshi Kajimoto ◽  
Eisuke Yamada ◽  
Masahisa Shinoda ◽  
Nelfa Desmira ◽  
Kuniyuki Kitagawa ◽  
...  
Keyword(s):  
Isotope Shift ◽  
Flame Structure ◽  
Laser Induced Fluorescence ◽  
Fluorescence Spectrometry ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser
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