Flow in sigmoid diffusers of moderate curvatureDeveloping laminar and turbulent flows have been measured in two diffusers with S- and C-shaped center-lines, small divergence angle and moderate curvature. The square inlet cross-section expanded in the plane of curvature to a rectangle with an exit-to-inlet area ratio of 1.5. Laser-Doppler anemometry was used to measure three velocity components and, in turbulent flow, the associated fluctuations and cross-correlations. Wall static pressure measurements are also reported. Flow visualization did not reveal the presence of any recirculation regions. Pressure-driven secondary flows are present in both ducts, but are generally smaller than those measured in similar ducts of uniform cross-section area.
Document ID
19850032201
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rojas, J. (Imperial Coll. of Science and Technology London, United Kingdom)
Whitelaw, J. H. (Imperial Coll. of Science and Technology London, United Kingdom)
Yianneskis, M. (Imperial College of Science and Technology London, United Kingdom)