An experimental investigation of the vortex-breakdown phenomenon

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Authors
Sarpkaya, Turgut
Subjects
Advisors
Date of Issue
1970-07-30
Date
7/30/1970
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The results of an experimental investigation of the characteristics of stationary and travelling vortex breakdowns in swirling flow in a diverging cylindrical tube are presented and discussed. Basically, three types of vortex breakdown were observed, viz., double helix, spiral, and axisymmetric breakdown. The type and location of the stationary breakdowns were found to be dependent upon the Reynolds and circulation numbers of the flow. The breakdown bubble responded to gradual and abrupt changes in the upstream and downstream flow conditions in a manner analogous to the hydraulic jump in open-channel flow. The observations reported and the evidence presented revealed unmistakably that the vortex breakdown is a finite transition from a uniform state of swirling flow (supercritical) to one (subcritical) featuring a large standing wave, followed by standing wavelets, of finite amplitude
Type
Technical Report
Description
Series/Report No
Department
Identifiers
NPS Report Number
NPS-59SL007IA
Sponsors
Funder
Format
NA
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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