A Shock Tube Study of the Ignition of Mixtures of N2O, CO, and PDF Download
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Author: Robert E. Case
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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A shock tube was employed to determine the ignition limit curves of three mixtures of N2O, CO, and N2. The ignition limit curve, which separates the ignition and no-ignition zones, is an experimentally determined curve plotted on temperature-pressure coordinates. The test gas mixtures of N2O, CO, N2 were ignited by the temperature rise behind the reflected shock wave for pressures in the range of 5 to 65 atmospheres. A 2-inch inside diameter constant area shock tube employing a helium driver was used to generate this reflected shock wave. Limited results were obtained on ignition delay time for each of the three gas mixtures. (Modified author abstract).
Author: Robert E. Case
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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Book Description
A shock tube was employed to determine the ignition limit curves of three mixtures of N2O, CO, and N2. The ignition limit curve, which separates the ignition and no-ignition zones, is an experimentally determined curve plotted on temperature-pressure coordinates. The test gas mixtures of N2O, CO, N2 were ignited by the temperature rise behind the reflected shock wave for pressures in the range of 5 to 65 atmospheres. A 2-inch inside diameter constant area shock tube employing a helium driver was used to generate this reflected shock wave. Limited results were obtained on ignition delay time for each of the three gas mixtures. (Modified author abstract).
Author: Robert Edward Case (CAPT, USAF.)
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ISBN:
Category : Carbon monoxide
Languages : en
Pages :
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Author: Roger Ronald Craig
Publisher:
ISBN:
Category : Shock tubes
Languages : en
Pages : 62
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Author: Philip Cheng-Kang Wu
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ISBN:
Category :
Languages : en
Pages : 260
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Author:
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Category : Aeronautics
Languages : en
Pages : 836
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Author: Anthony M. Dean
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Category :
Languages : en
Pages : 33
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Emissions at 450 nm and 4.27 micrometers have been measured when a variety of mixtures containing H2, CO, either O2 or N2O, and Ar were heated behind reflected shock waves to temperatures of 2000-2850 K and total concentrations near 5 x 10 to the 18th power molecule/cc. These emissions were used to obtain absolute concentration - time data for both oxygen atoms and carbon dioxide. The data were then compared to the results of numerical integrations of the likely mechanisms. It was observed that quantitative agreement between calculations and observations were obtained for the H2/CO/O2/Ar system using recent high temperature literature rate constants. For the H2/CO/N2O/Ar system, the rate constant for the reaction: H + N2O yields N2 + OH was adjusted so as to fit the data. Here it was found that a good fit to both (O) and (CO2) profiles could be achieved with k = 3 x 10 to the -9th power exp( -113kJ/RT) cc/molecule. Comparison to data at lower temperatures suggests that this might be another example of a 'Non-Arrhenius' rate constant. The implications of these results to studies of hydrocarbon oxidation are discussed. (Author).
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: Roger R. Craig
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 0
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Author: Anthony M. Dean
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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Reflected shock waves were used to heat N2O/C2H6/CO/Ar and N2O/CH4/CO/Ar mixtures to temperatures of 1875-2855 K at total concentrations of 5 x 10 to the 18th power CC. Oxygen atom production was monitored via the flame band emission at 450 nm, and CO2 production was observed at 4.27 micrometers. These data were then compared to the results of numerical integration of the rate equations, using rate constant and mechanistic information obtained in earlier studies of H2 and CH2O under similar conditions. For the C2H6 mixture, it was possible to achieve good agreement between these calculations and the observed data using only one addition reaction 0 + CH3 yileds CH2O + OH. The calculations were insensitive to the precise value used, but the results are consistent with recent high temperature literature values. For the CH4 mixture, the best agreement was achieved using a recent high temperature value for O + CH4 yields CH3 + OH. The data indicated that this reaction has a markedly non-Arrhenius rate constant; use of a value based upon low temperature data gives results inconsistent with those observed. The CH4 system was insensitive to any other methane reaction rate constant. There was some experimental evidence to suggest an unsuspected complexity in methyl radical decay channels at the lowest temperatures observed. The mechanism/rate constant combination used here was then applied to the analysis of literature data for CH3 oxidation by O2. This analysis was designed to obtain a value for the rate constant of CH3 + O2 yields CH2O + OH.
Author:
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ISBN:
Category :
Languages : en
Pages : 42
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