突扩燃烧室流场RANS与LES模拟

Comparison of RANS and LES in Dump Combustor Flow

以中心突扩燃烧室为模拟对象,分别从旋涡运动、空间速度分布和时间速度脉动等方面对RANS模拟结果、LES模拟结果和试验结果进行了比较分析。表明RANS方法没有模拟出燃烧室中的旋涡运动,与试验结果相差甚远;而LES方法则比较好地模拟出了燃烧室中旋涡运动和速度脉动。得出LES方法是对突扩燃烧室内流场数值研究的有效方法。

In this paper, RANS model and LES model were applied to study center-dump combustor. Both data were compared with experiment results from vortex motion, spatial velocity distribution and temporal velocity distribution. As a result, with the RANS model, no vortex motion appearing, it disagreed with experiment results. While with the LES model, vortex motion and velocity oscillation appeared as the experiment. So it was appropriate to apply LES model to study flow of dump combustor.