An experimental investigation of the vortex-breakdown phenomenon
By: by Turgut Sarpkaya
Contributors: Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1970
Place of publication: Monterey, California
Language: eng
Number of pages: 67
Subjects: Vortex-motion
Description: 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.
Notes: Title from cover.

"30 July 1970"--Cover.

"NPS-59SL0071A"--Cover.

DTIC Identifiers: Swirl flow.

Author(s) key words: Vortex breakdown, waves in swirling flows.

Includes bibliographical references (p. 57-59)

"Approved for public release; distribution unlimited"--Cover.

Technical report; 1970.