The study centers around an injector with gas-dynamic fuel atomization, i.e. an emulsion atomizer, which is not widely spread as the operating processes inside its channel and at its outlet at critical values of gas pressures and temperatures are poorly studied. To test the performance of the atomizer, we measured the components’ concentration fields at the outlet by a non-contact optical method. Within the research, we specified the experimental research technique, which hinges on a change in the illumination intensity as a result of re-reflection of rays between particles when light passes through a cloud of atomized liquid. The technique makes it possible to fairly correctly determine the boundaries of liquid atomizing in a gas flow and the distribution of the relative flow rate along the spray height. Furthermore, we determined the minimum number of partition virtual zones, i.e. clouds, which give a sufficiently low calculation error. Finally, to confirm the applicability of the technique, we considered the distribution of the liquid supplied by the jet nozzle perpendicular to the airflow.
The study centers around an injector with gas-dynamic fuel atomization, i.e. an emulsion atomizer, which is not widely spread as the operating processes inside its channel and at its outlet at critical values of gas pressures and temperatures are poorly studied. First, we analyzed experimental data on the study of the fuel splash from the air intake pipe of the emulsion atomizer at various values of the oncoming air flow and the geometrical parameters of the outlet openings of the atomizer and evaluated the splash in terms of the gas dynamics of air flows inside the atomizer. Then, we developed a model that described the conditions for a fuel splash to occur from the point of view of the kinematics of the drops’ movement, and attempted to physically justify why the model was preferable. Next, we applied an analytical method to obtain a characteristic complex that linked the fuel splash phenomenon with the operating modes and geometrical parameters of the fuel distribution device. Analytical calculations made it possible to summarize the available experimental data and to obtain a graphical dependence, showing the boundary of the occurrence of a fuel splash from the air intake pipe of the emulsion atomizer. Finally, we gave recommendations to prevent the occurrence of a splash.
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