Shock Train/Boundary-Layer Interaction in Rectangular Isolators
Shock Train/Boundary-Layer Interaction in Rectangular Isolators
复制标题
DOI：
10.2514/1.j054917
复制
发表时间：
2016-08
期刊：
影响因子：
2.5
通讯作者：
Jonathan S. Geerts;K. Yu
中科院分区：
文献类型：
--
作者：
Jonathan S. Geerts;K. Yu
本文研究了来流马赫数为2.5、AR分别为3.0和6.0的矩形隔离段中的激波串。所获得的知识是用来提出一个矩形隔离器修改现有的经验激波串长度关系的基础上圆形管道。一种新颖的多平面阴影概念允许从多个角度同时进行流动可视化。在低动量角流区的边界层分离被观察到发生在中心流场上游约一个管道高度处。前缘激波串结构由斜激波-正激波混合阵面组成，斜激波由角区分离产生，在中心线附近转变为正激波阵面。沿着管道长轴进行的动态壁压测量允许直接比较外侧传感器和中心线传感器检测初始不起动的能力，外侧传感器检测分离引起的压力上升远早于中心线测量。个...
Shock trains in rectangular isolators with inflow Mach number of 2.5 and ARs of 3.0 and 6.0 are investigated. Knowledge gained is used to propose a rectangular isolator modification to existing empirical shock train length relations based on circular ducts. A novel, multiplane shadowgraph concept allows simultaneous flow visualization from multiple perspectives. Boundary-layer separation in the low-momentum corner flow regions is observed to occur upstream of the center-flow field by approximately one duct height. The leading edge shock train structure is composed of a hybrid oblique–normal shock front, with oblique shocks spawning from the corner flow separation transforming into a normal shock front near the centerline. Dynamic wall pressure measurements made along the duct major axis allow for direct comparison between the outboard and centerline sensor’s ability to detect incipient unstart, with the outboard sensor detecting the separation-induced pressure rise well ahead of centerline measurements. A...