Liquid Jets in Subsonic Air Crossflow at Elevated Pressure
Liquid Jets in Subsonic Air Crossflow at Elevated Pressure
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DOI：
10.1115/1.4028565
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发表时间：
2014-06
影响因子：
1.5
通讯作者：
Jinkwan Song;C. C. Cain-C.;J. Lee
中科院分区：
文献类型：
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作者：
Jinkwan Song;C. C. Cain-C.;J. Lee
研究了 Jet A-1 燃料在空气横流中的破碎、渗透、液滴尺寸和尺寸分布，重点关注周围气压的影响。数据通过粒子多普勒相控分析仪 (PDPA)、采用激光片增强的高速摄影的米氏散射、以及采用纳米脉冲灯增强的 ICCD 相机的米氏散射进行收集。喷嘴孔口直径do为0.508mm，喷嘴孔口长度与直径之比lo/do为5.5。空气横流速度范围为 29.57 至 137.15 m/s，气压为 2.07 至 9.65 bar，温度保持恒定在 294.26 K。控制燃料流量以提供 5 至 25 范围内的燃料/空气动量通量比 q 和 250 至 1000 的韦伯数。根据结果，使用测量的液滴尺寸数据建议了平均液滴尺寸的调整相关性通过 PDPA 如下；显示公式(1)D0D32=0.267Wea0.44q0.08ρlρa0.30μlμa-0.16 这种相关性非常吻合，并显示了气动韦伯数Wea、动量通量比q 和密度比ρl/ρa 的作用。观察到破碎状态图相对于周围气压的变化，并揭示了每种破碎模式之间的边界可以通过从上述相关性导出的变换相关性来预测。此外，从平均米氏散射图像中提取了喷射器下游每个轴向位置处最大米氏散射强度的喷雾轨迹。根据这些结果，在一系列条件下与相关参数（包括 q、x/do、密度比、粘度比和韦伯数）建立关联。根据最大米氏散射强度下的喷雾轨迹，周围气压的影响在远场变得更加重要。另一方面，气动韦伯数的影响在近场更为重要。Copyright © 2014 by ASME
The breakup, penetration, droplet size and size distribution of a Jet A-1 fuel in air crossflow has been investigated with focus given to the impact of surrounding air pressure. Data has been collected by Particle Doppler Phased Analyzer (PDPA), Mie-Scattering with high speed photography augmented by laser sheet, and Mie-Scattering with ICCD Camera augmented by nano-pulse lamp. Nozzle orifice diameter, do, was 0.508 mm and nozzle orifice length to diameter ratio, lo/do, was 5.5. Air crossflow velocities ranged from 29.57 to 137.15 m/s, air pressures from 2.07 to 9.65 bar and temperature held constant at 294.26 K. Fuel flow was governed to provide a range of fuel/air momentum flux ratio q from 5 to 25 and Weber number from 250 to 1000. From the results, adjusted correlation of the mean drop size has been suggested using drop size data measured by PDPA as follows; Display Formula(1)D0D32=0.267Wea0.44q0.08ρlρa0.30μlμa-0.16 This correlation agrees well and shows roles of aerodynamic Weber number, Wea, momentum flux ratio, q, and density ratio, ρl/ρa. Change of the breakup regime map with respect with surrounding air pressure has been observed and revealed that the boundary between each breakup modes can be predicted by a transformed correlation induced from above correlation. In addition, the spray trajectory for the maximum Mie-scattering intensity at each axial location downstream of injector was extracted from averaged Mie-scattering images. From these results correlations with the relevant parameters including q, x/do, density ratio, viscosity ratio, and Weber number are made over a range of conditions. According to spray trajectory at the maximum Mie-scattering intensity, the effect of surrounding air pressure becomes more important in the farfield. On the other hand, effect of aerodynamic Weber number is more important in the nearfield.Copyright © 2014 by ASME