论文部分内容阅读
为深入了解真实航空发动机燃烧室内流场结构,在自有CFD平台上采用动态亚网格湍流模型对一种径向双旋流环形燃烧室的单个头部构型冷态流场进行了大涡模拟。为保证模拟精度,没有对模型进行常规简化处理,对包括全部气膜冷却小孔在内的所有精细结构均进行了完全仿真。计算验证了程序对高度复杂流场的模拟能力,结果表明,大涡模拟能较为全面地反映燃烧室内复杂流场从静止启动到统计定常的非定常发展过程,并成功捕捉到流场中心回流区等各种大尺度结构及涡旋破碎泡等旋流特征;大涡模拟所获得的时间平均流场结构与已有PIV试验结果定性一致,与RANS计算相比更接近试验测量值。
In order to understand the structure of the flow field in a real aero-engine combustion chamber, the dynamic sub-grid turbulence model was used to simulate the single head configuration of a radial double swirl flow simulation. To ensure simulation accuracy, the model was not routinely simplified and all the fine structures, including all film-cooling holes, were fully simulated. The results show that the large eddy simulation can reflect the unsteady development process of the complex flow field from stationary to statistic steady state more completely, and successfully capture the central recirculation zone of the flow field And other swirling features such as large-scale structures and vortex broken bubble. The time-averaged flow field structure obtained by large-eddy simulation is qualitatively consistent with the results of the existing PIV test and is closer to the experimental measurement than the RANS calculation.