Shock Tube Studies of Ignition and the High Temperature Reactions of Flame Inhibitors PDF Download
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Author: Bijan Vakilzadeh
Publisher:
ISBN:
Category :
Languages : en
Pages : 610
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Author: Bijan Vakilzadeh
Publisher:
ISBN:
Category :
Languages : en
Pages : 610
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Author: Alfred Gordon Gaydon
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 338
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Author: Owen Marcus Pryor
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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Experimental data for ignition delay times and species time-histories (CH4) were obtained in mixtures diluted with CO2. Experiments were performed behind reflected shockwaves from temperatures of 1200 to 2000 K for pressures ranging from 1 to 11 atm. Ignition times were obtained from emission and laser absorption measurements. Current experimental data were compared with the predictions of detailed chemical kinetic models (available from literature) that will allow for accurate design and modeling of combustion systems.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1416
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Author: G. B. Skinner
Publisher:
ISBN:
Category : Fireproofing agents
Languages : en
Pages : 84
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The aim of this research is to obtain fundamental understanding of combustion and extinguishment, initially for hydrogen-oxygen and hydrazine-nitrogen tetroxide. Chemical agents that extinguish the flame by inhibiting the combustion process are being considered. For the hydrogen-oxygen system, temperature and OH concentration profiles were obtained for flat hydrogen-oxygen-ethylene flames. Ethylene at concentrations below 4 per cent produced significant reductions in OH concentrations. These data will be correlated by calculations described below. Its effectiveness increases as the equivalence ratio increases from 1 (stoichiometric) to 6, but decreases in still richer flames. It has little inhibiting action at an equivalence ratio of 14, presumably because at the low temperature of this flame (800°K) the flames is self-inhibited by HO2 formation. Flame speed of three H2-air mixtures were measured at temperatures up to 500°C. Pyrolysis of CF3F4Br2 was carried out in the shock tube. Both decomposed to produce Br atoms, but C2F4Br2 more readily than CF3Br. This may account for the greater effectiveness of C2F4Br2 as flame inhibitor in H2-air mixtures. The IBM program for computing flame speeds and temperature and composition profiles in flames proved applicable, but time-consuming, for a simple model reaction, X[right arrow]Y. The solutions are being studied to look for short cuts, so that when used for the H2-air reaction, machine time will not be excessive. For the hydrazine-nitrogen tetroxide system, screening of inhibitors to prevent spontaneous ignition of hydrazine in N2O4 was completed. Of the total 55 candidates tested, thiophene and toluene were the most effective. However, each increased the hypergolic ignition limit from about 11% to 19% of NO2* in argon at 75°C, when 5% by volume of inhibitor was present. This is not a striking effect, and it seems unlikely that an inhibitor will be found which would prevent ignition of hydrazine in a pure N2O4-NO2 mixture. To gain further insight into the mechanism of hydrazine-NO*2 ignition, argon-diluted streams of the two gases are being rapidly mixed in a stirred reactor, and the final temperatures and product compositions are being studied. To the same end, high-speed schlieren photographs of a drop of hydrazine igniting in a NO2-argon atmosphere were taken. These show the nonflame reaction preceding the establishment of a diffusion flame.
Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 1766
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Author:
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ISBN:
Category : Detonation waves
Languages : en
Pages : 1532
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Author: Tim Lieuwen
Publisher: CRC Press
ISBN: 1420085352
Category : Science
Languages : en
Pages : 388
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Coal, still used to generate more than half of the electric power in the U.S., will likely be part of any future global energy plan. But this finite resource is also responsible for 80 percent of the CO2 emissions from power production, and its continued use will require improved processing techniques that are less damaging to the environment and l
Author: A. Gaydon
Publisher: Springer Science & Business Media
ISBN: 9400957203
Category : Science
Languages : en
Pages : 440
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Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1556
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