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- W1574254824 abstract "Automotive gasoline fuel sprays exhibit complex structures, within which vortex rings can be clearly traced. These structures have been studied experimentally and theoretically. The experimental data used for the analysis were obtained in the following conditions. Liquid iso-octane was injected at a frequency of 1 Hz, pressures of 3.5 bar (Port (PFI) injector) and 100 bar (Direct (G-DI) injector) into air at atmospheric pressure and a temperature of 20 °C. Phase Doppler Anemometry was performed over a measurement grid that covered the whole spray. The decaying phase showed the most clearly defined vortex ring-like structures. To model the observed properties of these structures, a generalised vortex ring model was applied. In this model, the time dependence of the vortex ring thickness �e is given by the relation �e =at b , where a is an arbitrary positive number, and 2 / 1 4 / 1 d d b .The predictions of the model were compared with the results of experimental studies, described earlier. The data analyses were focused on the determination of the time evolution of the locations of the regions of maximal vorticity and the axial velocities in these locations. Most of the values of the axial velocity of the vortex ring-like structures for the G-DI injector lie between the theoretically predicted values corresponding to the late stage of vortex ring development and b=1/4 (fully developed turbulence) and 1/2 (laminar case). The results for the PFI injector seem to be not compatible with model predictions. Paper ID ILASS08-6-5" @default.
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- W1574254824 date "2008-01-01" @default.
- W1574254824 modified "2023-09-26" @default.
- W1574254824 title "Vortex ring-like structures in gasoline fuel sprays: modelling and observations" @default.
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