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Modelling of the atomization of a plain liquid fuel jet in crossflow at gas turbine conditions

机译：燃气轮机条件下横流中普通液体燃料射流雾化的建模

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摘要

The penetration and atomization of a plain jet of kerosene fuel in air crossflow were modelled and compared with the experiment at test conditions relevant to lean premixed prevaporized combustion in gas turbines. Tests were conducted at an air velocity of 100 and 75 m/s and an air pressure of 6 and 9 bar at ambient temperature. The fuel no/,zle diameter was 0.45 mm and the liquid-to-air momentum flux ratio was between 2 and 18. Measurement techniques employed include time-resolved shadowgraphs, Mie-scattering laser light sheets, and Phase-Doppler-Anemometry. Hence qualitative information on jet disintegration as well as quantitative data regarding jet penetration, fuel placement and dropsize distribution were obtained. The numerical model predicts the jet penetration by treating the liquid fuel jet conceptually as a cylinder deflected by the airflow. Fracture of the liquid column is modelled by a characteristic time criterion. Shear breakup of the liquid column and its fragments is modelled as liquid boundary layer stripping. The engineering model has been implemented as an extension into a 3d CFD-code with Lagrangian particle tracking. Within its application limits, the model fills the gap of lacking droplet initial conditions in numerical spray simulation, while at the same time requiring low computational effort.
机译：模拟了普通煤油燃料射流在空气横流中的渗透和雾化，并在与燃气轮机稀薄预混预蒸发燃烧相关的测试条件下与实验进行了比较。在环境温度下以100和75 m / s的风速以及6和9 bar的气压进行测试。燃料的直径为0.45 mm，液空动量通量比为2到18。采用的测量技术包括时间分辨阴影图，米氏散射激光片和相多普勒风速仪。因此，获得了有关射流崩解的定性信息以及有关射流穿透，燃料放置和液滴尺寸分布的定量数据。数值模型通过将液体燃料射流概念上视为气流偏转的气缸来预测射流的渗透。液柱的断裂通过特征时间准则进行建模。液柱及其碎片的剪切破裂被建模为液边界层汽提。工程模型已实现为具有拉格朗日粒子跟踪功能的3d CFD代码的扩展。在其应用范围内，该模型填补了数值喷雾模拟中缺少液滴初始条件的空白，同时所需的计算量也很少。

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