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Proceedings Paper

Coanda ejector: why it works
Author(s): M. Ameri; Alexander Dybbs
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Paper Abstract

From thrust augmenters to material movers Coanda ejectors have many applications in industry. Despite these widespread potential uses, the operating principles of these ejectors are not clearly understood. Hence it is often difficult to design these ejectors for specific applications. The purpose of this study was to experimentally elucidate the key physics of Coanda ejectors. The measurement of the velocity profiles inside the ejector were successfully accomplished by angling the beams of a laser anemometer with respect to the axis of the ejector. Also turbulence intensities, turbulence spectrum, correlation function and wall pressure distributions were measured. The results from this study indicate that there exists a universal velocity distribution for all velocity profiles at different locations, operating conditions and ejectors. Also based on the experimental results we postulated a mechanism for the operation of the Coanda ejectors that is different from classic ejectors.

Paper Details

Date Published: 6 August 1993
PDF: 8 pages
Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); doi: 10.1117/12.150516
Show Author Affiliations
M. Ameri, Case Western Reserve Univ. (United States)
Alexander Dybbs, Case Western Reserve Univ. (United States)

Published in SPIE Proceedings Vol. 2052:
Fifth International Conference on Laser Anemometry: Advances and Applications
J. M. Bessem; R. Booij; H. W. H. E. Godefroy; P. J. de Groot; K. Krishna Prasad; F. F. M. de Mul; E. J. Nijhof, Editor(s)

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