论文标题
使用DIRICHLET倍曲面的超热喷雾剂中闪光沸腾现象的数学建模
Mathematical Modeling of Flash Boiling Phenomena in Superheated Sprays at low Degree of Superheat using Dirichlet Hyperboloids
论文作者
论文摘要
周围腔室的降压或注入液体的过热是导致喷雾闪烁的，这促进了自由表面附近的许多气泡的微探索，从而导致喷雾剂的主要雾化。在这项工作中，我们提出了一个数学模型，并且使用Dirichlet倍或解释微爆炸过程，而在过热的液体喷气机中观察到外部闪烁现象。开发的数学模型是在拉格朗日框架中实现的，以研究喷雾结构，并且发现数值模拟的结果与文献的实验结果非常吻合。在完全闪烁的机制的一开始区域，由于高径向速度弹出的液滴的阻力增加，钟形的喷雾结构变得显着。但是，在较低的超热程度下，发现液滴尺寸随着环境压力的降低而增加。而相反的趋势是在更高程度的过热程度下观察到的。
The depressurization of the surrounding chamber or superheating of the injected liquid is responsible for the flashing of the sprays, which promotes micro-explosion of many bubbles near free-surface and thereby leading to primary atomization of sprays. In this work, we propose a mathematical model, and the Dirichlet hyperboloids are used to explain the micro-explosion process while the external flashing phenomenon is observed in superheated liquid jets. The developed mathematical model is implemented in the Lagrangian framework to study the spray structure, and the results of numerical simulations are found to be in good agreement with the experimental results from the literature. In the onset region of a fully flashing regime, the bell-shaped spray structure becomes eminent due to increased drag on the high radial-velocity ejected droplets. However, at a lower degree of superheat, the droplet size is found to increase with a decrease in ambient pressure. Whereas the opposite trend is observed at a higher degree of superheat.
