The pre-film breakup in a high-performance gas turbine combustor is simplified into a two-dimensional and three-dimensional liquid sheet breakup, and the liquid sheet breakup processes, mechanisms and characteristics are investigated under nearly representative operating conditions. First, the two-dimensional flat liquid sheet breakup processes are simulated using a Reynolds-averaged Navier–Stokes (RANS) model and a VOF (volume of fluid) method. The effect of airflow velocity on the liquid sheet breakup distance is analyzed under various high-speed airflow velocities of 80 m/s, 180 m/s and 280 m/s. Then, the three-dimensional liquid sheet breakup processes are simulated using the large eddy simulation (LES)/VOF method, and the variations of the characteristics of both the horizontal liquid sheet and the oblique liquid sheet, such as the breakup process, breakup mode, breakup distance, wave characteristics and liquid sheet thickness, are analyzed. It’s found that for the two-dimensional flat liquid sheet breakup, the liquid sheet breakup distance decreases with the increase of airflow velocity or Weber number (We). When the airflow inlet velocities are 80 m/s (We = 6.13), 180 m/s (We = 220.5) and 280 m/s (We = 741.13), the liquid sheet breakup distances are 22.2 mm, 16.0 mm and 10.5 mm, respectively. An empirical formula of the liquid sheet breakup distance was thus summarized. For the three-dimensional liquid sheet breakup, as the airflow inlet angle increases, the breakup distance is significantly shortened, which is 2.21 mm at 0° and 1.85 mm at 15°, and the oscillation angle of the liquid sheet becomes larger. For the oblique liquid sheet breakup, the liquid sheet breakup mode becomes more complicated and the surface wave fluctuation amplitude increases. The empirical formula prediction values of the liquid sheet breakup distance developed in this study are in good agreement with the numerical results.

将高性能燃气轮机燃烧室中的预膜破裂简化为二维和三维液膜破裂，并在几乎具有代表性的工作条件下研究了液膜破裂的过程，机理和特性。首先，使用雷诺平均Navier-Stokes（RANS）模型和VOF（流体体积）方法对二维平面液膜破裂过程进行仿真。在80 m / s，180 m / s和280 m / s的各种高速气流速度下，分析了气流速度对液膜破裂距离的影响。然后，使用大涡模拟（LES）/ VOF方法来模拟三维液膜破裂过程，并分析水平液膜和倾斜液膜的特性变化，分析了诸如破裂过程，破裂模式，破裂距离，波动特性和液膜厚度等。研究发现，对于二维平面液膜破碎，液膜破碎距离随着气流速度或韦伯数（Weer）的增加而减小。当气流入口速度为80 m / s（We = 6.13），180 m / s（We = 220.5）和280 m / s（We = 741.13）时，液膜破裂距离为22.2 mm，16.0 mm和10.5 mm ， 分别。从而总结了液体片破裂距离的经验公式。对于三维液膜破裂，随着气流入口角的增加，破裂距离显着缩短，其在0°时为2.21mm，在15°时为1.85mm，并且液体片的振荡角变大。对于倾斜的液膜破裂，液体片的破裂模式变得更加复杂，并且表面波波动幅度增大。本研究开发的液膜破裂距离经验公式预测值与数值结果吻合良好。