Abstract
An effective procedure to investigate the microstructure of turbulent flows is the spectral analysis of velocity fluctuations. A hot-wire anemometry method is presented by which spectra of all velocity fluctuations in three-dimensional single-phase flows may be determined. A single hot-wire probe is positioned under different conditions relative to the mean flow field at the point investigated. At each probe position the fluctuating signal of the hot-wire anemometer is analysed by means of a suitable spectrum analyser. This method is used to investigate an unbaffled mixing system. Some results of spectral measurements are presented and compared with simple theoretical considerations.
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