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采用大涡模拟的方法研究旋流预混燃烧室中的流动及燃料空气混合过程,选取亚格子湍动能模式为基准的涡黏模型,通过模拟涡核的运动过程定性的表征了拟序结构的发展;引入混合不均匀度的概率密度函数,研究入口边界条件尤其是入口速度对于涡团破碎及混合程度的影响规律;通过研究速度分量与燃料质量分数脉动的相关性,分析了不同方向的速度脉动对于混合过程的影响因子.这些均为进一步研究旋流预混燃烧室的燃烧不稳定性及污染物排放提供了理论上的指导.
The large eddy simulation method was used to study the flow and fuel air mixing process in the swirling premixed combustion chamber. The eddy viscosity model was selected based on the sublattice kinetic energy model. The eddy current dynamics model was used to qualitatively characterize the structure of the ordered structure The introduction of the probability density function of mixing inhomogeneity to study the effect of inlet boundary conditions, especially inlet velocity, on the degree of vortex fragmentation and mixing. By studying the correlation between velocity components and fuel mass fraction pulsation, the velocity in different directions The influence factors of pulsation on the mixing process are all the theoretical guidance for further research on the combustion instability and pollutant emissions of the swirling premixed combustion chamber.