Atomization characteristics of planar prefilming nozzle
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摘要:
试验研究了韦伯数、气液动量比对预膜喷嘴雾化特性的影响。应用高速相机正面拍摄获得油膜表面波动形态，并用本征正交分解法分析了油膜波动频率，利用液相不连续思想获取油膜厚度；应用相位多普勒粒子分析仪获得了油滴索太尔直径。结果表明：气液动量比对油膜厚度影响较大，韦伯数对油膜波动频率影响较大。气液动量比由0.75增大到30.39，最小油膜厚度由0.38 mm减小到0.15 mm，而雾化粒度仅由38.8 μm减小到33.5 μm；韦伯数由11.91增大到61.51，油膜波动频率由2.9 Hz增大到207.0 Hz，初始雾化距离明显减小，雾化粒度由37.1 μm减小到24.9 μm。
Abstract: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.
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Key words:
- prefilming nozzle /
- Weber number /
- momentum ratio /
- oil film thickness /
- fluctuation frequency /
- atomized particle size
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表 1 试验工况
Table 1. Test conditions
工况 燃油速度/
（m/s）空气速度/
（m/s）韦伯数 气液
动量比1 0.14 22 11.91 30.39 2 0.21 30 22.15 3 0.28 50 61.51 4 0.38 30 22.15 9.28 5 0.678 2.92 6 1.34 0.75 
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表 2 不同韦伯数油膜波动频率
Table 2. Oil film fluctuation frequency with different We
韦伯数 波动频率/Hz 11.91 2.9 22.15 90.5 61.51 207.0
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表 3 不同气液动量比油膜波动频率
Table 3. Oil film fluctuation frequency with differentγ
气液动量比 波动频率/Hz 30.39 90.5 9.28 18.1 2.92 30.1 0.75 41.3
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表 4 不同韦伯数雾化粒度
Table 4. SMD with different We
韦伯数 距预膜板尾缘距离/mm 5 10 15 20 25 11.91 46.0 45.0 40.1 37.4 37.1 22.15 41.4 39.2 37.1 34.5 31.2 61.51 34.1 29.4 25.2 24.2 24.9
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表 5 不同气液动量比雾化粒度
Table 5. SMD with different
$ \boldsymbol{\gamma } $ 气液
动量比距预膜板尾缘距离/mm 5 10 15 20 25 9.28 45.0 40.5 37.6 36.3 33.5 2.92 47.6 42.7 38.2 36.2 36.0 0.75 63.5 53.9 47.4 42.1 38.8
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