Accession Number : AD0500575

Title :   Chemi-Ionization in Low Pressure Hydrocarbon Flames.

Descriptive Note : Technical rept.,

Corporate Author : GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV

Personal Author(s) : Porter,Raymond P.

Report Date : JUN 1968

Pagination or Media Count : 46

Abstract : A white largely inorganic solid is deposited on the interior walls of a water-cooled gas sampling probe during the flow of flame gases through the probe. Weight profiles of this material have been obtained in several lean methane and one lean acetylene flame, burning at 18 torr on a large diameter porous metal burner. Sharp maxima in recovered solids are obtained toward the upper edge of the luminous zone where positive ion concentrations and rates of formation also attain maximum values. Electron concentration profiles were also obtained with an especially designed Langmuir probe. Maxima in positive ion and in electron concentrations were reached at the same position in the flames. Chemi-ionization is believed because of these results to be a heterogeneous reaction involving particles and hydrocarbon flame species. A number of techniques were applied in a search for trace species formed during methane combustion. A large number of compounds were found at short distances above the burner and reflect the complexities of low temperature kinetics. (Author)

Descriptors :   (*HYDROCARBONS, COMBUSTION), (*FLAMES, IONIZATION), IONS, GAS IONIZATION, COMBUSTION PRODUCTS, COMBUSTION DEPOSITS, PRESSURE, GAS FLOW, SAMPLERS, TEMPERATURE, CONCENTRATION(CHEMISTRY), IMPURITIES, OXIDATION, REACTION KINETICS (U) METHANE, ALKYNES, ELECTRON DENSITY, LANGMUIR PROBES, FREE RADICALS, HYPERSONIC FLIGHT, ATMOSPHERE ENTRY, WAKE, ABLATION, BOUNDARY LAYER, REENTRY VEHICLES, NOSE CONES, RADAR REFLECTIONS, RADAR DECEPTION, LUMINESCENCE, ALUMINA

Subject Categories : Guided Missiles
      Radar Countermeasures
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE