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Title: Multipoint / Overdrive: Synergized Initiation Mechanisms


No abstract provided.

  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Technical Report
Country of Publication:
United States
42 ENGINEERING; Synergy; detonator; multipoint

Citation Formats

Tasker, Douglas George. Multipoint / Overdrive: Synergized Initiation Mechanisms. United States: N. p., 2017. Web. doi:10.2172/1351219.
Tasker, Douglas George. Multipoint / Overdrive: Synergized Initiation Mechanisms. United States. doi:10.2172/1351219.
Tasker, Douglas George. Fri . "Multipoint / Overdrive: Synergized Initiation Mechanisms". United States. doi:10.2172/1351219.
title = {Multipoint / Overdrive: Synergized Initiation Mechanisms},
author = {Tasker, Douglas George},
abstractNote = {No abstract provided.},
doi = {10.2172/1351219},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 24 00:00:00 EDT 2017},
month = {Fri Mar 24 00:00:00 EDT 2017}

Technical Report:

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  • Sodium-sulfate-induced hot corrosion of preoxidized IN-738 was studied at 975 C with special emphasis placed on the processes occurring during the long induction period. Thermogravimetric tests were run for predetermined periods of time, and then one set of specimens was washed with water. Chemical analysis of the wash solutions yielded information about water soluble metal salts and residual sulfate. A second set of samples was cross sectioned dry and polished in a nonaqueous medium. Element distributions within the oxide scale were obtained from electron microprobe X-ray micrographs. Evolution of SO was monitored throughout the thermogravimetric tests. Kinetic rate studies weremore » performed for several pertinent processes appropriate rate constants were obtained from the following chemical reactions: Cr2O3 + 2 Na2SO4(1) + 3/2 O2 yields 2 Na2CrO4(1) + 2 SO3(g)n TiO2 + Na2SO4(1) yields Na2O(TiO2)n + SO3(g)n TiO2 + Na2CrO4(1) yields Na2O(TiO2)n + CrO3(g).« less
  • Although considerable progress has been made in recent years in understanding the phenomenology of soot formation in the combustion of hydrocarbon fuels, relatively little attention has been focused upon aromatic fuels of the types commonly found in coal liquids. In particular, the effects of gas-phase free radicals, formed during combustion, on the kinetics of formation of incipient soot particles have not been characterized. Accordingly, an experimental investigation of the detailed kinetics of incipient soot formation in the combustion and pyrolysis of aromatic fuels of the benzene, anisole, phenol, and pyrrole families has been initiated in order to determine soot formationmore » mechanisms and rate parameters. The experiments will be performed in a shock tube over the temperature range 1300 to 2500 K, using multiple ultraviolet, visible, and infrared diagnostics to monitor the kinetic behavior of free radicals (such as OH), incipient soot particles, and combustion products. Experiments will be conducted with artificially enhanced concentrations of free radicals such as OH and O to determine their effects on the kinetics of soot and soot precursors. The experimental work will be supported and directed by a parallel analytical effort using a detailed mechanistic model of the chemical kinetics and dynamics of the reacting systems. In this report, the design and configuration of the experimental apparatus are described, the details of the kinetic model are outlined, and possible reaction pathways are discussed.« less
  • Pyrolysis and combustion of toluene in incident shock waves (1300 to 2500/sup 0/K, 0.3 to 0.8 atm) is being investigated, using optical techniques to monitor the kinetic behavior of incipient soot and several gas phase species. This report describes experiments in which the effects of the radicals OH, O, and H on soot initiation in fuel-rich toluene were studied. In the pyrolysis of toluene near 2000/sup 0/K, the initial reaction is probably rapid formation of the benzyl radical C/sub 7/H/sub 7/, which then forms acetylenic fragments. Dramatic soot formation occurs after about 1 ms. There are kinetic similarities between pyrolyticmore » and oxidative sooting. The sudden onset of sooting in pyrolysis suggest a mechanism involving reactions between major ring fragments and a rapidly growing radical pool. In contrast to toluene, pyridine forms essentially no soot, indicating that the molecular structure of the parent fuel and its ring fragmentation pattern determines the sooting tendency. 19 references, 8 figures, 2 tables. (DLC)« less
  • Shock tube experiments on the combustion of toluene are being performed by monitoring gaseous species and incipient soot particles. Prior to the combustion study, it was necessary to calibrate optical detection systems using kinetically well-established systems. The optical diagnostics calibrated were OH resonance absorption (309 nm), CO-O flameband emission (367 nm), CO/sub 2/ and CO IR emissions (4.3 and 5.0, respectively). In this report the results of optical calibrations and preliminary toluene combustion experiments are presented.
  • This is the Fifth Quarterly Report in a research program to study soot formation in the combustion of aromatic hydrocarbons in a shock tube. The results of Mie-theory analysis of light attenuation data in the pyrolysis of toluene are presented. The setup and calibration of several optical combustion diagnostics are described.