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- W2074433178 abstract "This paper summarizes chemical modeling results for exhaust jets of high-altitude supersonic aircraft. Emphasis is placed on reactions involving species with a potential environmental impact.The jet exhaust can be divided into two flow regions each having distinct chemical features. The first is an isothermal core region which extends many nozzle diameters downstream from the engine exit. Chemical kinetic modeling of this region yields concentrations of reactive atoms and radicals such as H, O, OH, and HO2, which are many orders of magnitude greater than their local equilibrium values. Net rates of atom and radical recombination are slow, and the chemistry of species such as NOx and SOx is dominated by steady-state mechanisms controlled by the radical concentrations.The second flow regime is one of rapid turbulent mixing between the engine exhaust and the surrounding air flow, which quickly quenches many of the chemical reactions. Recombination of H, O, HO2, and OH then occurs within a time scale of tens of milliseconds. However, the model results show that if the core region radical concentrations are comparable to NOx concentrations, as is the case with afterburning, appreciable NOx may be converted to HNO2. Conversion to HNO3 might be more important from an environmental viewpoint. Partial conversion of NOx to HNO3 is found to take place only when significant quantities of unburned hydrocarbons are present in the plume." @default.
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- W2074433178 date "1974-03-01" @default.
- W2074433178 modified "2023-09-27" @default.
- W2074433178 title "High-altitude jet plume chemistry" @default.
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- W2074433178 doi "https://doi.org/10.1016/0094-5765(74)90114-3" @default.
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