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Some Low Speed Experimental Results on the Effects of Swirl and Velocity Distribution on an Axi-Symmetric Jet

Published online by Cambridge University Press:  07 June 2016

A.D. Young  and
K.N. Rao
A.D. Young
Affiliation:
(Department of Aeronautical Engineering, Queen Mary College, University of London)
K.N. Rao
Affiliation:
(Department of Aeronautical Engineering, Queen Mary College, University of London)
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Summary

The flows resulting from a number of different methods for producing swirl in an axi-symmetric jet have been investigated. These methods include upstream vanes, tangential injection, a twisted plastic sheet and rotation of part of the jet pipe. Tests were also made with the first two types of swirl device in association with a radial distribution of axial velocity in the jet which had a minimum on the axis produced by a suitably graded wire grid or web inserted in the jet pipe. The measurements covered the mean (axial and swirl) velocity distributions as well as the main turbulence quantities at various stations downstream of the jet exit. It was found that the swirl considerably enhanced the rate of growth of the mixing region as previous workers have shown, but there was a significant reduction of this enhancement when the axial velocity increased from the centre outwards. This is in accordance with current concepts on the stability of curved turbulent shear flows.

Type
Research Article
Information
Aeronautical Quarterly , Volume 29 , Issue 4 , November 1978 , pp. 270 - 284
Copyright
Copyright © Royal Aeronautical Society. 1978

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References

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