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Title: Recirculation in swirling flow - a manifestation of vortex breakdown

Abstract

The addition of a sufficiently high degree of swirl to flow going into a circular pipe produces a limited region of reversed flow. Such a vortex breakdown, as it is termed, represents a zone of transition from a supercritical to a subcritical flow state. If the flow remains subcritical, an unavoidable consequence is that the geometry and conditions downstream directly affect the upstream flow up to, and including, the breakdown region. Laser Dopper anemometer measurements of the swirl and axial velocity components, as well as the corresponding streamline patterns, are presented for water flow in a model based upon the geometry of a swirl combustor. It is shown that a strong exit contraction (55 percent of the diameter) has practically no influence on a flow which reverts to supercritical, whereas even a weak contraction (15 percent of the diameter) has a significant influence on a flow which remains subcritical. It is argued that a cold flow is likely to be totally unrepresentative of a reacting flow through the same geometry, and, also, that great care has to be taken over the boundary conditions to be imposed for the numerical computation of subcritical flows. 20 references.

Authors:
;
Publication Date:
Research Org.:
Brown, Boveri et Cie. AG, Baden, Switerland
OSTI Identifier:
5488512
Resource Type:
Journal Article
Journal Name:
AIAA J.; (United States)
Additional Journal Information:
Journal Volume: 23
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; TURBULENT FLOW; MATHEMATICAL MODELS; COMBUSTION CHAMBERS; FLOW VISUALIZATION; REACTION KINETICS; FLUID FLOW; KINETICS; 420400* - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Escudier, M P, and Keller, J J. Recirculation in swirling flow - a manifestation of vortex breakdown. United States: N. p., 1985. Web. doi:10.2514/3.8878.
Escudier, M P, & Keller, J J. Recirculation in swirling flow - a manifestation of vortex breakdown. United States. doi:10.2514/3.8878.
Escudier, M P, and Keller, J J. Tue . "Recirculation in swirling flow - a manifestation of vortex breakdown". United States. doi:10.2514/3.8878.
@article{osti_5488512,
title = {Recirculation in swirling flow - a manifestation of vortex breakdown},
author = {Escudier, M P and Keller, J J},
abstractNote = {The addition of a sufficiently high degree of swirl to flow going into a circular pipe produces a limited region of reversed flow. Such a vortex breakdown, as it is termed, represents a zone of transition from a supercritical to a subcritical flow state. If the flow remains subcritical, an unavoidable consequence is that the geometry and conditions downstream directly affect the upstream flow up to, and including, the breakdown region. Laser Dopper anemometer measurements of the swirl and axial velocity components, as well as the corresponding streamline patterns, are presented for water flow in a model based upon the geometry of a swirl combustor. It is shown that a strong exit contraction (55 percent of the diameter) has practically no influence on a flow which reverts to supercritical, whereas even a weak contraction (15 percent of the diameter) has a significant influence on a flow which remains subcritical. It is argued that a cold flow is likely to be totally unrepresentative of a reacting flow through the same geometry, and, also, that great care has to be taken over the boundary conditions to be imposed for the numerical computation of subcritical flows. 20 references.},
doi = {10.2514/3.8878},
journal = {AIAA J.; (United States)},
number = ,
volume = 23,
place = {United States},
year = {1985},
month = {1}
}