Coanda ejector: why it works

M. Ameri; Alexander Dybbs

doi:10.1117/12.150516

6 August 1993 Coanda ejector: why it works

M. Ameri, Alexander Dybbs

Proceedings Volume 2052, Fifth International Conference on Laser Anemometry: Advances and Applications; (1993) https://doi.org/10.1117/12.150516
Event: Laser Anemometry: Advances and Applications: Fifth International Conference, 1993, Koningshof, Veldhoven, Netherlands

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.

Citation Download Citation

M. Ameri and Alexander Dybbs "Coanda ejector: why it works", Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); https://doi.org/10.1117/12.150516

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