Aircraft-mounted gas turbine engines may need to employ a variety of inlet ducts to perform various missions. An inertial particle separator (IPS) is a type of inlet duct that can remove harmful dust and debris from an engine’s flow path. The IPS is a bifurcating duct that is designed to remove particles, but it may also cause undesired flow separation. A novel study on such a bifurcating duct at high Reynolds number is undertaken. This is the first study to perform unsteady, three-dimensional simulations of the flow inside an IPS. The improved delayed detached eddy simulation numerical method is applied to a time-resolved experimental S-duct case to ensure the approach is valid. Results showed highly unsteady, separated flow, consistent with experiments. The time-resolved, three-dimensional structure of flow inside an IPS is visualized for the first time.

安装在飞机上的燃气涡轮发动机可能需要采用各种进气管来执行各种任务。惯性颗粒分离器 (IPS) 是一种入口管道，可以从发动机的流动路径中去除有害的灰尘和碎屑。IPS 是一种分叉管道，旨在去除颗粒，但它也可能导致不希望的流动分离。对这种高雷诺数下的分叉管道进行了一项新的研究。这是对 IPS 内部流动进行非稳态三维模拟的第一项研究。将改进的延迟分离涡模拟数值方法应用于时间分辨实验S-duct案例，以确保该方法的有效性。结果显示高度不稳定的分离流，与实验一致。时间解决了，