The Effect of Film Development On Primary Breakup in a Prefilming Airblast Atomiser

Jack R. J. Wetherell, Andrew Garmory
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Abstract

Liquid fuelled gas turbines are likely to remain a dominant force in aviation propulsion for the foreseeable future, and therefore understanding the atomisation process is key to meeting future emissions and performance legislation. To make experiments and simulations possible, simplified geometry and boundary conditions are often used, for example, simulations of primary atomisation often use a fixed film height and velocity. This paper aims to quantify the effect of a fully developed unsteady film on the atomisation process. A custom Coupled Level Set & Volume of Fluid (CLSVOF) solver with adaptive meshing built in OpenFOAM v9 is used. A simulation of the atomisation process in the Karlsruhe Institute of Technology atomisation experiment (Warncke et al., 2017) is presented. A precursor simulation of the film development is used to provide accurate, temporally and spatially resolved inlet boundary conditions. These results are compared to previous CLSVOF simulations from Wetherell et al. (2020) using traditional boundary conditions. The unsteady film has doubled the modal ligament length and widened the distribution, and is now in better agreement with experimental measurements. A clear correlation in both time and space is observed between the film, atomisation process, and spray. The SMD is significantly increased, again giving better agreement with the experiment. A discussion of extracting statistical descriptions of the spray is given, outlining the unfeasible computational cost required to converge droplet diameter distributions and other high order statistics for a case such as this.
薄膜显影对预成膜喷气雾化器中一次打散的影响
在可预见的未来,液体燃料燃气轮机仍将是航空推进领域的主导力量,因此了解雾化过程是满足未来排放和性能法规要求的关键。为了使实验和模拟成为可能,通常会使用简化的几何形状和边界条件,例如,一级雾化模拟通常使用固定的薄膜高度和速度。本文旨在量化充分发展的非稳定薄膜对雾化过程的影响。本文使用了 OpenFOAM v9 中自适应性网格划分的定制耦合液面集和流体体积(CLSVOF)求解器。介绍了卡尔斯鲁厄理工学院雾化实验(Warncke 等人,2017 年)中的雾化过程模拟。薄膜发展的前驱模拟用于提供精确、时间和空间分辨率高的入口边界条件。这些结果与 Wetherell 等人(2020 年)之前使用传统边界条件进行的 CLSVOF 模拟进行了比较。非稳态薄膜将模态韧带长度增加了一倍,并扩大了分布范围,现在与实验测量结果更加一致。薄膜、雾化过程和喷雾之间在时间和空间上都有明显的相关性。SMD 明显增加,再次与实验结果更加吻合。本文讨论了提取喷雾统计描述的问题,概述了在这种情况下收敛液滴直径分布和其他高阶统计所需的不可行的计算成本。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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