Vortex-induced transient stall

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 Ω . Two results emerge out of the analytic research: first it is shown that...

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Bibliographic Details
Published in:Archive of applied mechanics (1991) 2019-02, Vol.89 (2), p.307-312
Main Authors: Pelz, P. F., Taubert, P.
Format: Article
Language:English
Subjects:
Circular tubes
Classical Mechanics
Engineering
Flow separation
Flow theory
Fluid dynamics
Fluid flow
Original
Potential flow
Stagnation point
Theoretical and Applied Mechanics
Turbomachinery
Vortex rings
Vortices
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Summary: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 Ω . 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 Ω ind < 0.5 Ω . 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.
ISSN:0939-1533
1432-0681
DOI:10.1007/s00419-018-1468-5