Abstract
Rayleigh scattering is used as a visualization technique to study density fluctuations due to acoustical waves produced at the exit of a turbulent air jet flow. Scattering is produced by sending a 532-nm laser beam through the flow. The scattered light is collected by a lens and projected to a screen to achieve an image. Pictures showing the crossover between expansion and compression waves in the jet have been obtained. The technique allows the mapping of the pattern of shock waves along the jet. These pictures can provide information of the exit velocity by analyzing the angle formed by the waves closest to the nozzle. Rayleigh scattering can also be used in an alternative technique that detects the scattered light by heterodyning. The current that comes out of the photodetector is proportional to the spatial Fourier transform (for a particular wave vector) of the density fluctuations as a function of time. [Work supported by UNAM through the DGAPA Project No. IN107599.]
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