Abstract
An experimental study was carried out for weakly swirling flows through a circular-sectioned 90° bend with a curvature radius ratio of 4.0. Three components of mean and fluctuating velocities were measured by the technique of rotating a probe with an inclined hot wire at a Reynolds number of 60000. Flow patterns of main and secondary streams, and turbulence energy distributions in pipe sections are shown, and explanations are offered for phenomena observed in the streamwise direction. Results are compared with those for nonswirling flow and the influence of swirl on the flow is clarified, especially in terms of intensities of secondary flow and turbulence.
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