Spectral characteristics of vortex breakdown flowfields
- 1 November 1979
- journal article
- Published by AIP Publishing in Physics of Fluids
- Vol. 22 (11) , 2053-2064
- https://doi.org/10.1063/1.862514
Abstract
Laser‐Doppler anemometer measurements upstream and in the wakes of vortex breakdowns of bubble and spiral types are described. Spectral analysis of the data indicates prominent oscillations in the wakes at less than 10 Hz. These oscillations correspond closely to theoretical predictions of the linearly most unstable normal modes of the time‐averaged mean flow profiles. The oscillations are more energetic, and vortex core expansions are greater for flows with a bubble form of vortex breakdown, which is therefore regarded as the stronger form of breakdown.Keywords
This publication has 6 references indexed in Scilit:
- An experimental map of the internal structure of a vortex breakdownJournal of Fluid Mechanics, 1978
- The Structure of Vortex BreakdownAnnual Review of Fluid Mechanics, 1978
- Disrupted states of vortex flow and vortex breakdownPhysics of Fluids, 1977
- Experiments on vortex stabilityPhysics of Fluids, 1976
- The stability of a trailing line vortex. Part 1. Inviscid theoryJournal of Fluid Mechanics, 1974
- On the hydrodynamic and hydromagnetic stability of swirling flowsJournal of Fluid Mechanics, 1962