Measurements of a Mach 2.3 Turbulent Boundary Layer Using High-Speed Imaging of Linear Array-FLDI
James R. Chism, Mark Gragston, Scott Peltier, Thomas A. McManus
Abstract
View Video Presentation: https://doi.org/10.2514/6.2022-3474.vid This work demonstrates and discusses the use of a high-speed camera for signal collection in a multi-point focused laser differential interferometer (FLDI). This approach is motivated by the interest among researchers in increasing the number of simultaneously probed points and the potential to do a 2D array with linear array-FLDI (LA-FLDI). Measurements in Mach 2.0 and Mach 2.3 turbulent boundary layers are demonstrated and a comparison of 1 MHz imaging versus the conventional photodetector setup is provided. Furthermore, the determination of disturbance convective velocity with the camera method is discussed along with demonstrating the use of cylindrical lens FLDI to measure thin boundary layer heights with a higher level of accuracy than currently available..