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Vortex-Induced Transient Stall

Pelz, P. F. and Taubert, Paul (2018):
Vortex-Induced Transient Stall.
In: Archive of Applied Mechanics, Springer, pp. 1-6, ISSN 1432-0681,
DOI: 10.1007/s00419-018-1468-5,
[Online-Edition: https://link.springer.com/article/10.1007/s00419-018-1468-5],
[Article]

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 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 Ωind<0.5Ω. 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.

Item Type: Article
Erschienen: 2018
Creators: Pelz, P. F. and Taubert, Paul
Title: Vortex-Induced Transient Stall
Language: English
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 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 Ωind<0.5Ω. 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.

Journal or Publication Title: Archive of Applied Mechanics
Publisher: Springer
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Fluid Systems (FST)
Date Deposited: 04 Oct 2018 12:05
DOI: 10.1007/s00419-018-1468-5
Official URL: https://link.springer.com/article/10.1007/s00419-018-1468-5
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