RDX flame structure

Book · Fri Dec 30 23:00:00 EST 1994

OSTI ID:93317

Hanson-Parr, D; Parr, T ^[1]

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1. Naval Air Warfare Center, China Lake, CA (United States)

Nonintrusive diagnostics were used to measure temperature and species profiles during neat RDX deflagration at 1 atm. UV-visible absorption was measured to obtain absolute concentration profiles of NO, NO{sub 2}, CN, NH, H{sub 2}CO, and OH. Temperature and species concentrations were obtained by spectral fitting. Planar laser-induced fluorescence (PLIF) of these same species was also measured to obtain two-dimensional (2D) profiles in the flame with excellent spatial resolution. The flame structure is characterized by a dark zone close to the surface and a visible flame sheet above the dark zone. For CO{sub 2} laser-assisted deflagration, the narrow flame sheet NH profile peaks 2.3 mm above the surface at a value of 100 ppm. The CN profile is slightly wider and peaks at 2.5 mm at a value of 660 ppm. The OH profile peaks outside the CN/NH flame sheet with a mole fraction of 0.055. The dark zone species studied here were NO{sub 2} and NO. The NO{sub 2} peaks very close to the surface at about 0.17 mole fraction and decays rapidly to 0 at 1.5 mm. Close to the surface, the NO mole fraction is about 0.2 and falls sharply to 0.05 at 2.5 mm as NO is consumed in the CN/NH flame sheet. No formaldehyde was detected. Rotational temperature profiles were measured from OH PLIF and NO absorption spectra. The NO gas temperature near the surface is in good agreement with prior thermocouple measurements. The temperature rises sharply to about 1,500 K at 0.3 mm and then turns over to a much more gradual slope in the dark zone. At about 2 mm, it becomes steeper again and finally levels out to 2,600 K at 3.0 mm, at the top edge of the CN flame sheet.

• OSTI ID: 93317
• Report Number(s): CONF-940711--
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
ABSORPTION SPECTRA
AMINES
CHEMICAL EXPLOSIVES
COMBUSTION KINETICS
CYANIDES
DETONATIONS
EXPERIMENTAL DATA
FLAMES
FORMALDEHYDE
GAS ANALYSIS
HYDROXYL RADICALS
KINETIC EQUATIONS
MORPHOLOGY
NITRIC OXIDE
NITROGEN DIOXIDE
TEMPERATURE DISTRIBUTION
TEMPERATURE MEASUREMENT
VALIDATION