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Improved Atomization via a Mechanical Atomizer with Optimal Geometric Parameters and an Air-Assisted Component

机译:通过具有最佳几何参数和空气辅助组件的机械雾化器改善雾化

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摘要

Atomization of liquid media is a key aim in various technological disciplines, and solutions that improve spray performance, while decreasing energy consumption, are in great demand. That concept is very important in the development of liquid fuel spray atomizers in high-efficiency microturbines and other generator systems with low inlet pressure and a wide range of power supply. Here we present a study of the liquid atomization characteristics for a new mechanical atomizer that has optimal geometric parameters and a preliminary swirl stage. In our air-assisted atomizer, air is introduced through a swirl chamber positioned at the exit of the mechanical atomizer. The optimized mechanical atomizer alone can achieve drop diameters in the range of 80 to 40 µm at water supply pressures of 2 to 5 bar, respectively. The addition of an air swirl chamber substantially decreases drop sizes. At an air–liquid ratio (ALR) equal to 1, water pressures of 2.5 to 3 bar and air supply pressures 0.35 to 1 bar, drops with diameters of 20–30 µm were obtained. In an air-assisted atomizer the parameters of the mechanical atomizer have a much stronger influence on drop diameters than do characteristics of the air-swirl chamber. Using a mechanical atomizer with optimal geometrical dimensions allows limiting the liquid supply pressure to 5 bar; but when an air-assisted component is introduced we can recommend an ALR ≈ 1 and an air supply pressure of up to 1 bar.
机译:液体介质的雾化是各个技术领域的主要目标,因此在提高喷雾性能的同时降低能耗的解决方案的需求量很大。这个概念对于高效微型涡轮机和其他具有低入口压力和宽范围电源的发电机系统中的液体燃料喷雾雾化器的开发非常重要。在这里,我们介绍了一种新型机械雾化器的液体雾化特性的研究,该雾化器具有最佳的几何参数和初步的旋流阶段。在我们的空气辅助雾化器中,空气通过位于机械雾化器出口处的涡流室引入。仅优化的机械雾化器在2至5 bar的供水压力下即可分别实现80至40 µm的液滴直径。空气涡流室的增加大大减小了液滴尺寸。在气液比(ALR)等于1时,水压为2.5到3 bar,空气供应压力为0.35到1 bar,得到直径为20-30 µm的液滴。在空气辅助雾化器中,机械雾化器的参数对液滴直径的影响远大于空气涡流室的特性。使用具有最佳几何尺寸的机械雾化器可将液体供应压力限制为5 bar;但是,当引入空气辅助部件时,我们建议您使用ALR≈1,并且空气供应压力最高为1 bar。

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