Study on buoyant instabilities of high pressures laminar jet flames

Lorenzo Angelilli; Pietro Paolo Ciottoli; Riccardo M. Galassi; Francisco E. Hernández Pérez; Mauro Valorani; Hong G. Im

Study on buoyant instabilities of high pressures laminar jet flames

Lorenzo Angelilli^*, Pietro Paolo Ciottoli, Riccardo M. Galassi, Francisco E. Hernández Pérez, Mauro Valorani, Hong G. Im

^*Corresponding author for this work

Research output: Contribution to conference › Paper › peer-review

1 Scopus citations

Abstract

Laminar diffusion jet flames are subjected to buoyant instabilities when the Froude number is lower than a critical value. In the present work, a numerical study on syngas laminar jet diffusion flames at elevated pressures (1, 2, 4, 8 and 12 bar) and buoyant instabilities is presented. Since the Reynolds number is kept constant, the velocity and Froude number diminish as pressure is increased. For pressures from 1 to 4 bar the flames display a steady behavior with a progressive reduction of the thickness, while for 8 and 12 bar the flames oscillate and pulsate. These predictions are consistent with experimental observations. Furthermore, for the unsteady flames, the pulsation of the flame thickness and spatial oscillations are quantified and analyzed.

Original language	English (US)
State	Published - 2019
Event	12th Asia-Pacific Conference on Combustion, ASPACC 2019 - Fukuoka, Japan Duration: Jul 1 2019 → Jul 5 2019

Conference

Conference	12th Asia-Pacific Conference on Combustion, ASPACC 2019
Country/Territory	Japan
City	Fukuoka
Period	07/1/19 → 07/5/19

ASJC Scopus subject areas

General Chemical Engineering
Energy Engineering and Power Technology
Fuel Technology
Condensed Matter Physics

Cite this

@conference{985b44bcecf14a2eabcf88f8b3ad089a,

title = "Study on buoyant instabilities of high pressures laminar jet flames",

abstract = "Laminar diffusion jet flames are subjected to buoyant instabilities when the Froude number is lower than a critical value. In the present work, a numerical study on syngas laminar jet diffusion flames at elevated pressures (1, 2, 4, 8 and 12 bar) and buoyant instabilities is presented. Since the Reynolds number is kept constant, the velocity and Froude number diminish as pressure is increased. For pressures from 1 to 4 bar the flames display a steady behavior with a progressive reduction of the thickness, while for 8 and 12 bar the flames oscillate and pulsate. These predictions are consistent with experimental observations. Furthermore, for the unsteady flames, the pulsation of the flame thickness and spatial oscillations are quantified and analyzed.",

author = "Lorenzo Angelilli and Ciottoli, {Pietro Paolo} and Galassi, {Riccardo M.} and {Hern{\'a}ndez P{\'e}rez}, {Francisco E.} and Mauro Valorani and Im, {Hong G.}",

note = "Publisher Copyright: {\textcopyright} Asia-Pacific Conference on Combustion, ASPACC 2019.All right reserved.; 12th Asia-Pacific Conference on Combustion, ASPACC 2019 ; Conference date: 01-07-2019 Through 05-07-2019",

year = "2019",

language = "English (US)",

}

TY - CONF

T1 - Study on buoyant instabilities of high pressures laminar jet flames

AU - Angelilli, Lorenzo

AU - Ciottoli, Pietro Paolo

AU - Galassi, Riccardo M.

AU - Hernández Pérez, Francisco E.

AU - Valorani, Mauro

AU - Im, Hong G.

PY - 2019

Y1 - 2019

N2 - Laminar diffusion jet flames are subjected to buoyant instabilities when the Froude number is lower than a critical value. In the present work, a numerical study on syngas laminar jet diffusion flames at elevated pressures (1, 2, 4, 8 and 12 bar) and buoyant instabilities is presented. Since the Reynolds number is kept constant, the velocity and Froude number diminish as pressure is increased. For pressures from 1 to 4 bar the flames display a steady behavior with a progressive reduction of the thickness, while for 8 and 12 bar the flames oscillate and pulsate. These predictions are consistent with experimental observations. Furthermore, for the unsteady flames, the pulsation of the flame thickness and spatial oscillations are quantified and analyzed.

AB - Laminar diffusion jet flames are subjected to buoyant instabilities when the Froude number is lower than a critical value. In the present work, a numerical study on syngas laminar jet diffusion flames at elevated pressures (1, 2, 4, 8 and 12 bar) and buoyant instabilities is presented. Since the Reynolds number is kept constant, the velocity and Froude number diminish as pressure is increased. For pressures from 1 to 4 bar the flames display a steady behavior with a progressive reduction of the thickness, while for 8 and 12 bar the flames oscillate and pulsate. These predictions are consistent with experimental observations. Furthermore, for the unsteady flames, the pulsation of the flame thickness and spatial oscillations are quantified and analyzed.

UR - http://www.scopus.com/inward/record.url?scp=85083954338&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:85083954338

T2 - 12th Asia-Pacific Conference on Combustion, ASPACC 2019

Y2 - 1 July 2019 through 5 July 2019

ER -

Study on buoyant instabilities of high pressures laminar jet flames

Abstract

Conference

ASJC Scopus subject areas

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