Abstract
AbstractThis paper reviews the work carried out since 1990 in establishing the characteristics and properties of rotating instabilities found in swirling flows, such as those of cyclone dust separators and swirl burners. Considerable efforts have been made over the years in establishing the cause and use of these instabilities in swirling flows. The general conclusion indicates that there is potential benefit in its existence in combustion systems, but is detrimental within dust separation/classification systems. The analysis of these flows have included laser diagnostics (Laser Doppler anemometry, particle image velocimetry and flow visualisation), temperature mapping and numerical analysis. Many of the experimental measurements use a phase locking system based on cyclic pressures. The following paper reviews and updates the numerical modelling of the instability found in rotating flows.
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