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Archive of Applied Mechanics

, Volume 89, Issue 2, pp 307–312 | Cite as

Vortex-induced transient stall

  • P. F. PelzEmail author
  • P. Taubert
Original
  • 112 Downloads

Abstract

This study analyzes the induced flow by a coaxial vortex ring inside a circular tube applying vortex theory and potential flow theory. The vortex ring itself is generated by bound vortices rotating with the angular frequency \({\varOmega }\). Two results emerge out of the analytic research: first it is shown that induction causes the rotation of the vortex ring. It rotates at the sub-synchronous frequency \({\varOmega }_\mathrm {ind}<0.5\,{\varOmega }\). Second, the ring vortex itself induces an axial velocity at the tube wall. Superimposed with the axial main flow, this results in a stagnation point. Since the vortex strength increases in time, the stagnation point moves upstream. This kinematic effect may falsely be interpreted as a dynamic boundary layer separation. Hence, the results may give new insights into transient stall phenomena in axial turbomachinery.

Keywords

Analytical methods Fluid dynamics Kinematic stall Potential theory Turbomachinery Vortex dynamics 

Notes

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Chair of Fluid SystemsTechnische Universität DarmstadtDarmstadtGermany

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