Measurements of Primary and Secondary Flows in an Industrial Forward-Curved Centrifugal Fan

[+] Author and Article Information
G. Cau, N. Mandas

Dipartimento di Ingegneria Meccania, Università di Cagliari, Italy

G. Manfrida

Dipartimento di Energetica, Università di Firenze, Italy

F. Nurzia

Dipartimento di Ingegneria Meccanica, Università di Cagliari, Italy

J. Fluids Eng 109(4), 353-358 (Dec 01, 1987) (6 pages) doi:10.1115/1.3242671 History: Received May 28, 1986; Online October 26, 2009


An industrial-type centrifugal-flow fan was instrumented and tested in order to obtain a fully detailed relative flow pattern at impeller discharge. Testing entailed investigation of both primary flows (jet-wake pattern and presence of return flows) and secondary flows (due to streamwise vorticity either from meridional curvature or rotation effects). In addition to conventional probing, a crossed hot-wire probe was employed in the tests. Ensemble-averaging the hot-wire signals made it possible to obtain the three-dimensional phase-averaged relative flow pattern at discharge by means of double positioning of the probe. Results show secondary-flow effects of appreciable magnitude interacting with primary flows (e.g., return flow in the hub region and variations in vortex structure and wake position with variations in flowrate).

Copyright © 1987 by ASME
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