Effect of injection pressure on the atomization characteristics of a liquid sheet type swirl injector for Urea SCR system
Abstract: In this study, the spray characteristics of a pressure swirl atomizer classified into a liquid sheet type swirl nozzle for Urea SCR system were investigated experimentally with the variation of injection pressure. The length to diameter ratio (l o /d) of the nozzle was 3.1, and the swirler was set inside the nozzle tip to give injecting fluid angular momentum. The injection duration of the nozzle was controlled by PWM (pulse width modulation) modes. The development processes of the spray were imaged by a 2 D PIV system, and the change of spray angle was measured. The atomization characteristics, including axial velocity and SMD, were measured using a 2 D PDA system with the injection pressures at room temperature and ambient pres sure conditions. As the experimental results, the injection pressure had a significant impact on the spray struc ture showing a different shape around the spray leading edge, and the smaller SMD was observed with in creasing injection pressures, which was similar to that of the previous work.