Research on Cavitation Flow Characteristics in Thermal Sensitive Future Fuel Nozzles

<div class="section abstract"><div class="htmlview paragraph">In order to clarify the cavitation flow characteristics in future fuel nozzles and guide the design of new nozzle structural blocks, this research work was carried out in both experimental and simulation aspects. In the experiment, it was found that under high injection pressure, methanol showed more severe cavitation than diesel. By adding frosted glass, a better light effect was achieved in the nozzle hole. It was found that the front section of the nozzle had geometric induced cavitation, the middle section had vortex cavitation, and the rear section had expanded vortex cavitation. Traditional numerical models cannot accurately calculate this phenomenon. To this end, the two-phase physical properties that change with temperature and pressure were constructed, combined with multiphase, turbulence, and energy models, CFD calculations were performed and verified based on visualization results. On this basis, a comparative analysis of the flow mechanism in future fuel and traditional diesel fuel nozzles was carried out, and the influence of injection pressure, fuel temperature, and nozzle structure on the flow characteristics in future fuel nozzles was studied. The relevant research conclusions provide theoretical guidance for the design of future fuel systems.</div></div>