Atomization characteristics of planar prefilming nozzle
The effects of Weber number and air-liquid momentum ratio on the atomization characteristics of prefilm nozzle were experimentally studied.The fluctuation shape of oil film was obtained by front photographing with high-speed camera,and the fluctuation frequency of oil film was analyzed by proper orthogonal decomposition method.The oil film thickness was obtained by using the idea of liquid discontinuity,and the atomized droplets SMD was measured with PDPA.The results showed:the air-liquid momentum ratio had a great effect on the oil film thickness,and the Weber number had a great effect on the oil film fluctuation frequency.The air-liquid momentum ratio increased from 0.75 to 30.39,the minimum oil film thickness decreased from 0.38 mm to 0.15 mm,and the SMD reduced from 38.8 μm to 33.5 μm;the Weber number increased from 11.91 to 61.51,the oil film fluctuation frequency increased from 2.9 Hz to 207.0 Hz,the initial atomization distance decreased significantly,and the SMD reduced from 37.1 μm to 24.9 μm.
prefilming nozzleWeber numbermomentum ratiooil film thicknessfluctuation frequencyatomized particle size
NETL
NSTL
万方数据
