Effect analysis on the macrostructure and static stability limits of oxy-methane flames in a premixed swirl combustor

Medhat Nemitallah; Shabeeb Alkhaldi; Ahmed Abdelhafez; Mohamed Habib

doi:10.1016/j.energy.2018.06.131

Effect analysis on the macrostructure and static stability limits of oxy-methane flames in a premixed swirl combustor

Medhat Nemitallah^*
, Shabeeb Alkhaldi
, Ahmed Abdelhafez
, Mohamed Habib

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

In this study, the changes in macrostructure and static stability limits of CH₄/O₂/CO₂ flames were recorded experimentally in a premixed swirl combustor over ranges of equivalence ratio (φ) and oxygen fraction (OF: volumetric percentage of O₂ in the O₂–CO₂ oxidizer mixture) and under fixed Reynolds (Re) operation to isolate its dynamic effect on flame stabilization. Two-dimensional stability maps are presented as function of φ and OF. The maps are presented on contours of inlet velocity (U_in), combustor power density (PD) and adiabatic flame temperature (T_ad) to correlate these parameters with the stability limits. Selected flames were imaged to analyze the effects of φ, OF, U_in, T_ad and Re on flame stability. The results showed that sustaining premixed oxy-flames is not possible for OF below 29% and above 70%. Reactions kinetic rate is a more relevant parameter than Re for determining flashback limit. PD has a leading role for controlling flame stability near the lean blow out limit. U_in is more relevant than Re for controlling flame transition from the inner shear layer to the outer recirculation zone. Increasing Re widens the operability window by shifting blow out limit to leaner conditions.

Original language	English
Pages (from-to)	86-96
Number of pages	11
Journal	Energy
Volume	159
DOIs	https://doi.org/10.1016/j.energy.2018.06.131
State	Published - 15 Sep 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Ltd

Keywords

Adiabatic flame temperature
Fully premixed flames
Gas turbine combustion
Oxy-combustion
Reynolds number
Stability map

ASJC Scopus subject areas

Civil and Structural Engineering
Modeling and Simulation
Renewable Energy, Sustainability and the Environment
Building and Construction
Fuel Technology
Energy Engineering and Power Technology
Pollution
Mechanical Engineering
General Energy
Management, Monitoring, Policy and Law
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

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10.1016/j.energy.2018.06.131

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@article{26953bfa80e84897b253b2b14a3f6543,

title = "Effect analysis on the macrostructure and static stability limits of oxy-methane flames in a premixed swirl combustor",

abstract = "In this study, the changes in macrostructure and static stability limits of CH4/O2/CO2 flames were recorded experimentally in a premixed swirl combustor over ranges of equivalence ratio (φ) and oxygen fraction (OF: volumetric percentage of O2 in the O2–CO2 oxidizer mixture) and under fixed Reynolds (Re) operation to isolate its dynamic effect on flame stabilization. Two-dimensional stability maps are presented as function of φ and OF. The maps are presented on contours of inlet velocity (Uin), combustor power density (PD) and adiabatic flame temperature (Tad) to correlate these parameters with the stability limits. Selected flames were imaged to analyze the effects of φ, OF, Uin, Tad and Re on flame stability. The results showed that sustaining premixed oxy-flames is not possible for OF below 29\% and above 70\%. Reactions kinetic rate is a more relevant parameter than Re for determining flashback limit. PD has a leading role for controlling flame stability near the lean blow out limit. Uin is more relevant than Re for controlling flame transition from the inner shear layer to the outer recirculation zone. Increasing Re widens the operability window by shifting blow out limit to leaner conditions.",

keywords = "Adiabatic flame temperature, Fully premixed flames, Gas turbine combustion, Oxy-combustion, Reynolds number, Stability map",

author = "Medhat Nemitallah and Shabeeb Alkhaldi and Ahmed Abdelhafez and Mohamed Habib",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = sep,

day = "15",

doi = "10.1016/j.energy.2018.06.131",

language = "English",

volume = "159",

pages = "86--96",

journal = "Energy",

issn = "0360-5442",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Effect analysis on the macrostructure and static stability limits of oxy-methane flames in a premixed swirl combustor

AU - Nemitallah, Medhat

AU - Alkhaldi, Shabeeb

AU - Abdelhafez, Ahmed

AU - Habib, Mohamed

PY - 2018/9/15

Y1 - 2018/9/15

N2 - In this study, the changes in macrostructure and static stability limits of CH4/O2/CO2 flames were recorded experimentally in a premixed swirl combustor over ranges of equivalence ratio (φ) and oxygen fraction (OF: volumetric percentage of O2 in the O2–CO2 oxidizer mixture) and under fixed Reynolds (Re) operation to isolate its dynamic effect on flame stabilization. Two-dimensional stability maps are presented as function of φ and OF. The maps are presented on contours of inlet velocity (Uin), combustor power density (PD) and adiabatic flame temperature (Tad) to correlate these parameters with the stability limits. Selected flames were imaged to analyze the effects of φ, OF, Uin, Tad and Re on flame stability. The results showed that sustaining premixed oxy-flames is not possible for OF below 29% and above 70%. Reactions kinetic rate is a more relevant parameter than Re for determining flashback limit. PD has a leading role for controlling flame stability near the lean blow out limit. Uin is more relevant than Re for controlling flame transition from the inner shear layer to the outer recirculation zone. Increasing Re widens the operability window by shifting blow out limit to leaner conditions.

AB - In this study, the changes in macrostructure and static stability limits of CH4/O2/CO2 flames were recorded experimentally in a premixed swirl combustor over ranges of equivalence ratio (φ) and oxygen fraction (OF: volumetric percentage of O2 in the O2–CO2 oxidizer mixture) and under fixed Reynolds (Re) operation to isolate its dynamic effect on flame stabilization. Two-dimensional stability maps are presented as function of φ and OF. The maps are presented on contours of inlet velocity (Uin), combustor power density (PD) and adiabatic flame temperature (Tad) to correlate these parameters with the stability limits. Selected flames were imaged to analyze the effects of φ, OF, Uin, Tad and Re on flame stability. The results showed that sustaining premixed oxy-flames is not possible for OF below 29% and above 70%. Reactions kinetic rate is a more relevant parameter than Re for determining flashback limit. PD has a leading role for controlling flame stability near the lean blow out limit. Uin is more relevant than Re for controlling flame transition from the inner shear layer to the outer recirculation zone. Increasing Re widens the operability window by shifting blow out limit to leaner conditions.

KW - Adiabatic flame temperature

KW - Fully premixed flames

KW - Gas turbine combustion

KW - Oxy-combustion

KW - Reynolds number

KW - Stability map

UR - https://www.scopus.com/pages/publications/85049353013

U2 - 10.1016/j.energy.2018.06.131

DO - 10.1016/j.energy.2018.06.131

M3 - Article

AN - SCOPUS:85049353013

SN - 0360-5442

VL - 159

SP - 86

EP - 96

JO - Energy

JF - Energy

ER -

Effect analysis on the macrostructure and static stability limits of oxy-methane flames in a premixed swirl combustor

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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