Abstract
Abstract Confined turbulent air swirling flows are investigated for two configurations where swirl is produced by a conventional radial type swirler. The flow Reynolds number based on the bulk velocity in the downstream pipe was equal to 15,000 and the swirl number evaluated using velocity profiles in the downstream pipe was equal to 1.5. The flow downstream of the swirler has been quantified by measurements of three velocity components and their corresponding rms values along the radial direction and for several axial positions using laser Doppler anemometry. The downstream flow structure revealed the existence of an off-axis reverse flow region and a forced-vortex type of flow in the inner region and free-vortex in the outer one. The strength of the inner vortex is maintained with downstream distance. The results represent a set of benchmark data for validation of calculation methods.
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