Parametric Analysis of Excited Round Jets-Numerical Study

Artur Tyliszczak, Bernardus J. Geurts

Research output: Contribution to journalArticleAcademicpeer-review

16 Citations (Scopus)
33 Downloads (Pure)

Abstract

A computational analysis of excited round jets is presented with emphasis on jet bifurcation phenomenon due to superposition of axial and flapping forcing terms. Various excitation parameters are examined including the amplitudes of the forcing, their frequencies and phase shift. It is shown that alteration of these parameters significantly influences the spatial jet evolution. This dependence may be used to control the jet behaviour in a wide range of qualitatively different flow structures, starting from a modification of the spreading rate of a single connected jet, through large scale deformation of an asymmetric jet, onto jet bifurcation leading to a doubly and even triply split time-averaged jet, displaying different strengths and locations of the branches. We establish that: (i) jet splitting is possible only when the amplitudes of the forcing terms are comparable to or larger than the level of natural turbulence; (ii) the angle between the developing jet branches can be directly controlled by the frequency of the axial forcing and the phase shift between axial and flapping forcing. An optimum forcing frequency is determined, leading to the largest spreading rate.
Original languageUndefined
Pages (from-to)221-247
Number of pages27
JournalFlow, turbulence and combustion
Volume93
Issue number2
DOIs
Publication statusPublished - Sep 2014

Keywords

  • Jet bifurcation
  • Spreading rate
  • EWI-25026
  • Flow control
  • IR-91777
  • Axial and flapping forcing
  • METIS-306010

Cite this

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title = "Parametric Analysis of Excited Round Jets-Numerical Study",
abstract = "A computational analysis of excited round jets is presented with emphasis on jet bifurcation phenomenon due to superposition of axial and flapping forcing terms. Various excitation parameters are examined including the amplitudes of the forcing, their frequencies and phase shift. It is shown that alteration of these parameters significantly influences the spatial jet evolution. This dependence may be used to control the jet behaviour in a wide range of qualitatively different flow structures, starting from a modification of the spreading rate of a single connected jet, through large scale deformation of an asymmetric jet, onto jet bifurcation leading to a doubly and even triply split time-averaged jet, displaying different strengths and locations of the branches. We establish that: (i) jet splitting is possible only when the amplitudes of the forcing terms are comparable to or larger than the level of natural turbulence; (ii) the angle between the developing jet branches can be directly controlled by the frequency of the axial forcing and the phase shift between axial and flapping forcing. An optimum forcing frequency is determined, leading to the largest spreading rate.",
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pages = "221--247",
journal = "Flow, turbulence and combustion",
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Parametric Analysis of Excited Round Jets-Numerical Study. / Tyliszczak, Artur; Geurts, Bernardus J.

In: Flow, turbulence and combustion, Vol. 93, No. 2, 09.2014, p. 221-247.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Parametric Analysis of Excited Round Jets-Numerical Study

AU - Tyliszczak, Artur

AU - Geurts, Bernardus J.

N1 - eemcs-eprint-25026

PY - 2014/9

Y1 - 2014/9

N2 - A computational analysis of excited round jets is presented with emphasis on jet bifurcation phenomenon due to superposition of axial and flapping forcing terms. Various excitation parameters are examined including the amplitudes of the forcing, their frequencies and phase shift. It is shown that alteration of these parameters significantly influences the spatial jet evolution. This dependence may be used to control the jet behaviour in a wide range of qualitatively different flow structures, starting from a modification of the spreading rate of a single connected jet, through large scale deformation of an asymmetric jet, onto jet bifurcation leading to a doubly and even triply split time-averaged jet, displaying different strengths and locations of the branches. We establish that: (i) jet splitting is possible only when the amplitudes of the forcing terms are comparable to or larger than the level of natural turbulence; (ii) the angle between the developing jet branches can be directly controlled by the frequency of the axial forcing and the phase shift between axial and flapping forcing. An optimum forcing frequency is determined, leading to the largest spreading rate.

AB - A computational analysis of excited round jets is presented with emphasis on jet bifurcation phenomenon due to superposition of axial and flapping forcing terms. Various excitation parameters are examined including the amplitudes of the forcing, their frequencies and phase shift. It is shown that alteration of these parameters significantly influences the spatial jet evolution. This dependence may be used to control the jet behaviour in a wide range of qualitatively different flow structures, starting from a modification of the spreading rate of a single connected jet, through large scale deformation of an asymmetric jet, onto jet bifurcation leading to a doubly and even triply split time-averaged jet, displaying different strengths and locations of the branches. We establish that: (i) jet splitting is possible only when the amplitudes of the forcing terms are comparable to or larger than the level of natural turbulence; (ii) the angle between the developing jet branches can be directly controlled by the frequency of the axial forcing and the phase shift between axial and flapping forcing. An optimum forcing frequency is determined, leading to the largest spreading rate.

KW - Jet bifurcation

KW - Spreading rate

KW - EWI-25026

KW - Flow control

KW - IR-91777

KW - Axial and flapping forcing

KW - METIS-306010

U2 - 10.1007/s10494-014-9544-6

DO - 10.1007/s10494-014-9544-6

M3 - Article

VL - 93

SP - 221

EP - 247

JO - Flow, turbulence and combustion

JF - Flow, turbulence and combustion

SN - 1386-6184

IS - 2

ER -