Jiang Naibo, Webster Matthew, Lempert Walter R, Miller Joseph D, Meyer Terrence R, Ivey Christopher B, Danehy Paul M
Department of Mechanical Engineering, The Ohio State University, Columbus, Ohio 43201, USA.
Appl Opt. 2011 Feb 1;50(4):A20-8. doi: 10.1364/AO.50.000A20.
Nitric oxide planar laser-induced fluorescence (NO PLIF) imaging at repetition rates as high as 1 MHz is demonstrated in the NASA Langley 31 in. Mach 10 hypersonic wind tunnel. Approximately 200 time-correlated image sequences of between 10 and 20 individual frames were obtained over eight days of wind tunnel testing spanning two entries in March and September of 2009. The image sequences presented were obtained from the boundary layer of a 20° flat plate model, in which transition was induced using a variety of different shaped protuberances, including a cylinder and a triangle. The high-speed image sequences captured a variety of laminar and transitional flow phenomena, ranging from mostly laminar flow, typically at a lower Reynolds number and/or in the near wall region of the model, to highly transitional flow in which the temporal evolution and progression of characteristic streak instabilities and/or corkscrew-shaped vortices could be clearly identified.
在美国国家航空航天局兰利31英寸马赫10高超音速风洞中，展示了重复频率高达1兆赫兹的一氧化氮平面激光诱导荧光（NO PLIF）成像。在2009年3月和9月的两次风洞试验中，历时八天，获得了大约200个时间相关的图像序列，每个序列包含10到20个单独的帧。所展示的图像序列是从一个20°平板模型的边界层获取的，在该模型中，使用包括圆柱体和三角形在内的各种不同形状的突起物来诱导转捩。高速图像序列捕捉到了各种层流和过渡流现象，从通常在较低雷诺数和/或模型近壁区域的主要层流，到能够清晰识别特征条纹不稳定性和/或螺旋形涡旋的时间演变和发展的高度过渡流。
