Spray atomization is a complex process that is vital in many industrial applications such as combustion, agricultural chemical application, and powder formation. Spray processes occur under atmospheric conditions as well as increased ambient pressure environments, providing a need to observe both for a more complete understanding of spray characteristics and control mechanisms. This study presents the results from a coaxial airblast atomizer operated within a newly commissioned Chamber for Assorted Pressurized Spray sUrveiLlancE, or CAPSULE. The CAPSULE is a 190 liter, 316L stainless steel pressure vessel with six sight glasses that facilitate multiple experimental techniques. For this study, high-speed, back-illuminated images are taken of sprays inside the CAPSULE at a constant momentum flux ratio of 27 ± 1 for increasing swirl ratios and ambient pressures up to 0.5 MPa. The fluids used in the spray are compressed air and distilled water. Results for spray angle and intact length measurements are presented and compared to data from previous atmospheric studies. The spray angle results show that increasing the ambient pressure increases the spray angle when the swirl ratio is sufficient, with the maximum spray angle occurring when SR = 1 and P_amb = 0.5 MPa. Under lower swirl conditions, there was little to no difference in spray angle when varying ambient pressure. Intact length decreased with increasing swirl ratio, but there was little effect of ambient pressure. Atmospheric intact length measurements taken within the CAPSULE resembled those taken previously with atomizers of the same geometry.

中文翻译：

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高环境压力下同轴空气喷射雾化器的近场观测

喷雾雾化是一个复杂的过程，在许多工业应用中至关重要，例如燃烧、农药应用和粉末形成。喷雾过程发生在大气条件以及增加的环境压力环境下，因此需要同时观察以更全面地了解喷雾特性和控制机制。本研究展示了在新委托的混合加压喷雾表面或胶囊室中运行的同轴空气喷射雾化器的结果。CAPSULE 是一个 190 升、316L 不锈钢压力容器，带有六个视镜，可促进多种实验技术。对于这项研究，高速，以 27 ± 1 的恒定动量通量比拍摄胶囊内喷雾的背照式图像，以将涡流比和环境压力提高到 0.5 MPa。喷雾中使用的流体是压缩空气和蒸馏水。展示了喷雾角度和完整长度测量的结果，并与之前大气研究的数据进行了比较。喷雾角度结果表明，当涡流比足够时，增加环境压力会增加喷雾角度，最大喷雾角度出现在 SR = 1 和 P_amb = 0.5 兆帕。在较低的涡流条件下，改变环境压力时喷射角度几乎没有差异。完整长度随着涡流比的增加而减少，但环境压力的影响很小。在 CAPSULE 内进行的大气完整长度测量类似于以前使用相同几何形状的雾化器进行的测量。