Accession Number : ADA307002

Title :   UV to Near-IR Emissions from C2H2 + O and C3O2 + O Flames at Low Pressure and High Temperature.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS

Personal Author(s) : Sheaffer, P. M. ; Burke, M. L. ; Zittel, P. F.

PDF Url : ADA307002

Report Date : 01 NOV 1995

Pagination or Media Count : 40

Abstract : A spectroscopic study has been performed on the O + C2H2 combustion system in a high temperature, fast flow discharge system under highly dilute, fuel-lean conditions. Our previous work with room temperature flames has been extended to look for temperature-induced changes in the relative populations of CO(a), (a'), (d), and (e) reaction products by observing chemiluminescent emission in the 185-900 nm wavelength region at high temperatures. The effect of temperature on the relative yields of the CO triplet states was small, and the production rates increased linearly with the rate of the initial O + C2H2 reaction step. To test the importance of C2O as a major pathway to triplet state CO, the results are compared to similar experiments run on the O + C3O2 system, which yielded a vibrationally hotter CO state distribution than O + C2H2. The overall temperature behavior of the O + C3O2 spectrum was significantly different from O + C2H2 and may be related to temperature variation of the branching ratio yielding C2O in the initial reaction step. In addition, Cameron bands were observed at high temperatures (in order of decreasing relative intensity) when C2H4, C2H6, and CH4 were used as fuels, and the Cameron band intensities displayed an unusual dependence on fuel concentration

Descriptors :   *ULTRAVIOLET RADIATION, *HIGH TEMPERATURE, *LOW PRESSURE, *OXYGEN, *ACETYLENE, *FLAMES, *NEAR INFRARED RADIATION, FREQUENCY, EMISSION, SPECTROSCOPY, INTENSITY, ROOM TEMPERATURE, FUELS, CONCENTRATION(COMPOSITION), FLOW, PRODUCTION RATE, REACTANTS(CHEMISTRY), CHEMILUMINESCENCE.

Subject Categories : Organic Chemistry
      Inorganic Chemistry
      Thermodynamics
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE