Species and temperature profiles in ignition and deflagration of HMX

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5021728

Parr, T; Hanson-Parr, D

This paper reports on progress made in a program investigating the chemistry and kinetics of the ignition and combustion of solid propellants and their ingredients. Experiments were performed using imaging Planar Laser Induced Fluorescence (PLIF) to measure species and temperture profiles during CO/sub 2/ laser ignition and steady state deflagration of HMX. All experiments were done at one atmosphere. Time resolved PLIF images were obtained for NO/sub 2/, NO, CN, NH, H/sub 2/CO, OH, and OH rotational temperatures during ignition and deflagration of HMX. CN and NH form at reasonably large heights off the sample surface in gas phase ignition kernels at finite delays, and reform into relatively thin flame sheets which snap back towards the sample surface. NO/sub 2/ and NO are initial products during laser ignition, beginning to form at minimum delay times and producing tall plumes until ignition occurs in the gas phase. The NO/sub 2/ and NO PLIF signals are then confined to an expanding spherical shell plus a steady state solid core between the sample surface and the CN or NH flame sheet. Thus it appears that NO/sub 2/ and NO are early decomposition products which are consumed in a flame separated significantly from the surface. The CN and NH are produced in this flame as transient radicals. OH is produced at the same delay as CN and NH but extends very far beyond the thin CNNH flame front. OH rotational temperature profiles rise sharply at the CNNH flame sheet and level off at about 2772 degrees K beyond it. Evidence is given that the flames are two phase even for neat HMX. Little or no evidence for H/sub 2/CO was seen during ignition of HMX. Although large concentrations are seen during ignition of a nitramine composite propellant, this signal appears to be due to formaldehyde from decomposition of the PEG binder.

• OSTI ID: 5021728
• Report Number(s): CONF-870484-
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
AIR POLLUTION MONITORING
ALDEHYDES
AMINES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMBUSTION PRODUCTS
EMISSION SPECTROSCOPY
FLAMES
FLUORESCENCE SPECTROSCOPY
FORMALDEHYDE
FUELS
HEATING
IGNITION
KINETICS
LASER SPECTROSCOPY
LASER-RADIATION HEATING
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLASMA HEATING
PLUMES
PROPELLANTS
QUANTITATIVE CHEMICAL ANALYSIS
RADICALS
REACTION KINETICS
SOLID FUELS
SPECTROSCOPY
TEMPERATURE DISTRIBUTION
THERMAL DEGRADATION