Photon Correlation Velocimetry in Aerodynamics
For the aerodynamicist, the attraction of laser-Doppler measurement techniques is that they are essentially non-intrusive; they do not disturb the flow being studied. This is of particular value in certain classes of fluid-mechanical problem, where conventional instruments, such as hot-wire probes and pitot tubes, have serious limitations: for example, in recirculating and separated flows, in conditions of high turbulence, in the investigation of jet noise and in the study of vortex evolution. A research topic of practical importance for supercritical wing design is the detailed structure of the interaction between a normal shock wave and a turbulent boundary layer. Here, as we shall see, the laser anemometer has already yielded fundamentally new information.
KeywordsMach Number Autocorrelation Function Turbulence Intensity Turbulent Boundary Layer Supersonic Flow
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