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- W2063149099 abstract "A theoretical model of rocket-exhaust-plume afterburning which involves the interaction of turbulent mixing and chemical kinetics has been developed. The combustion kinetics for hydrogen-carbon monoxide reactions with air and the thermal and chemi-ionization processes, including charge transfer and recombination, which are significant in determining the exhaust-plume electron-density distribution are included. The chemi-ionization rate is included via an empirical technique which assumes that, for every 106 hydrocarbon molecules reacting, one electron is produced. The partial-differential equations describing the exhaust plume properties have been programmed for a high-speed digital computer, and calculations were made for a system similar to the exhaust of a large liquid-propellant engine burning LOX and kerosene. The results clearly show that chemical kinetics are important (i.e., equilibrium cannot be assumed) at an altitude of 50,000 ft, and that the relative importance of thermal and chemi-ionization in determining the local electron concentration depends on the turbulent mixing rate, which is a function of vehicle velocity. Variations in the alkali metal thermal ionization rate constant are shown to significantly affect the electron distribution, indicating a need for more accurate reaction-rate data. Alkali metals are also shown to be important when the major source of ions is chemi-ionization—due to the effects of charge transfer. A major limitation in making accurate electron density predictions is the lack of sufficient data on the concentration and type of hydrocarbon fragments in the exhaust, in addition to the need for a reliable chemical kinetic means of treating the subsequent chemi-ionization." @default.
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- W2063149099 date "1967-01-01" @default.
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- W2063149099 title "Thermal and chemi-ionization processes in afterburning rocket exhausts" @default.
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- W2063149099 doi "https://doi.org/10.1016/s0082-0784(67)80185-1" @default.
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