Simultaneous local 極tter, 2-D wavefronts and accelerometer measurements were performed in the flow over a flat-window turret at Mach numbers between 0.3 and 0.4 along a centerplane with a viewing angle varying between 90 and 118 degrees. Both local and global 極tter imposed on a small- and large-aperture laser beams were measured using position-sensing devices and a high-speed 2-D wavefront sensor. A linear stochastic estimation technique was applied to separate the mechanically-related component of the 極tter from the aero-optical component. Spectra of aero-optical 極tter for different elevation angles and speeds were calculated and useful sca領(lǐng) laws were proposed. It was shown that aero-optical 極tter was due to the presence of both the stationary and trave領(lǐng) aero-optical components. Detailed analysis of the global and the local 極tter spectra and the spectral cross-correlation between them at different speeds and viewing angles is presented and discussed in details. Additionally, PIV system was used to measure the flow field over the flat window, simultaneously with the aero-optical 極tter measurements. 德國LaVision PIV/PLIF粒子成像測速場儀 時間分辨粒子成像測速系統(tǒng)(TR-PIV) Imager sCMOS PIV相機