Modal Instability Analysis of Light Jets

L. Lesshafft; W. Coenen; X. Garnaud; A. Sevilla

doi:10.1016/j.piutam.2015.03.033

Modal Instability Analysis of Light Jets

L. Lesshafft
, W. Coenen
, X. Garnaud
, A. Sevilla

Universidad Carlos III de Madrid

Research output: Contribution to journal › Conference article › peer-review

Abstract

Linear global modes are computed for round helium jets in air at low Reynolds number. The governing equations are formulated in the limit of zero Mach number, and all parameters are chosen such as to model the experiments of Hallberg & Strykowski?. A single axisymmetric mode is found to become unstable beyond a critical Reynolds number value that depends on the initial shear layer thickness. The neutral curve for linear global instability is traced as a function of these two parameters, and this result compares favorably with the experimental reference measurements.

Original language	English
Pages (from-to)	137-140
Number of pages	4
Journal	Procedia IUTAM
Volume	14
DOIs	https://doi.org/10.1016/j.piutam.2015.03.033
Publication status	Published - 1 Jan 2015
Event	8th IUTAM-ABCM Symposium on Laminar Turbulent Transition, LTT 2014 - Rio de Janeiro, Brazil Duration: 8 Sept 2014 → 12 Sept 2014

Keywords

Global mode analysis
jet instability

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10.1016/j.piutam.2015.03.033

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@article{814b14867c23441a9700b8e446a01901,

title = "Modal Instability Analysis of Light Jets",

abstract = "Linear global modes are computed for round helium jets in air at low Reynolds number. The governing equations are formulated in the limit of zero Mach number, and all parameters are chosen such as to model the experiments of Hallberg \& Strykowski?. A single axisymmetric mode is found to become unstable beyond a critical Reynolds number value that depends on the initial shear layer thickness. The neutral curve for linear global instability is traced as a function of these two parameters, and this result compares favorably with the experimental reference measurements.",

keywords = "Global mode analysis, jet instability",

author = "L. Lesshafft and W. Coenen and X. Garnaud and A. Sevilla",

note = "Publisher Copyright: {\textcopyright} 2015 The Authors.; 8th IUTAM-ABCM Symposium on Laminar Turbulent Transition, LTT 2014 ; Conference date: 08-09-2014 Through 12-09-2014",

year = "2015",

month = jan,

day = "1",

doi = "10.1016/j.piutam.2015.03.033",

language = "English",

volume = "14",

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journal = "Procedia IUTAM",

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TY - JOUR

T1 - Modal Instability Analysis of Light Jets

AU - Lesshafft, L.

AU - Coenen, W.

AU - Garnaud, X.

AU - Sevilla, A.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Linear global modes are computed for round helium jets in air at low Reynolds number. The governing equations are formulated in the limit of zero Mach number, and all parameters are chosen such as to model the experiments of Hallberg & Strykowski?. A single axisymmetric mode is found to become unstable beyond a critical Reynolds number value that depends on the initial shear layer thickness. The neutral curve for linear global instability is traced as a function of these two parameters, and this result compares favorably with the experimental reference measurements.

AB - Linear global modes are computed for round helium jets in air at low Reynolds number. The governing equations are formulated in the limit of zero Mach number, and all parameters are chosen such as to model the experiments of Hallberg & Strykowski?. A single axisymmetric mode is found to become unstable beyond a critical Reynolds number value that depends on the initial shear layer thickness. The neutral curve for linear global instability is traced as a function of these two parameters, and this result compares favorably with the experimental reference measurements.

KW - Global mode analysis

KW - jet instability

U2 - 10.1016/j.piutam.2015.03.033

DO - 10.1016/j.piutam.2015.03.033

M3 - Conference article

AN - SCOPUS:84940652655

SN - 2210-9838

VL - 14

SP - 137

EP - 140

JO - Procedia IUTAM

JF - Procedia IUTAM

T2 - 8th IUTAM-ABCM Symposium on Laminar Turbulent Transition, LTT 2014

Y2 - 8 September 2014 through 12 September 2014

ER -

Modal Instability Analysis of Light Jets

Abstract

Keywords

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