Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames
In this study, the turbulent non-premixed methane-air flame is simulated to determine the effect of air velocity on the length of flame, temperature distribution and mole fraction of species. The computational fluid dynamics (CFD) technique is used to perform this simulation. To solve the turbulence...
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Polish Academy of Sciences
2016-09-01
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doaj-0cb6bde426da49f8a4c89ce7e44dc6c52020-11-25T03:12:30ZengPolish Academy of SciencesArchive of Mechanical Engineering 2300-18952016-09-0163335536610.1515/meceng-2016-0020meceng-2016-0020Investigation on Effect of Air Velocity in Turbulent Non-Premixed FlamesNamazian Zafar0Hashemi Heidar1Namazian Farideh2Department of Mechanical Engineering, College of Engineering, Yasooj Branch, Islamic Azad University, Yasooj, Iran (Islamic Republic of)Department of Mechanical Engineering, College of Engineering, Yasooj Branch, Islamic Azad University, Yasooj, Iran (Islamic Republic of)Department of Mechanical Engineering, College of Engineering, Yasooj Branch, Islamic Azad University, Yasooj, Iran (Islamic Republic of)In this study, the turbulent non-premixed methane-air flame is simulated to determine the effect of air velocity on the length of flame, temperature distribution and mole fraction of species. The computational fluid dynamics (CFD) technique is used to perform this simulation. To solve the turbulence flow, k-ε model is used. In contrast to the previous works, in this study, in each one of simulations the properties of materials are taken variable and then the results are compared. The results show that at a certain flow rate of fuel, by increasing the air velocity, similar to when the properties are constant, the width of the flame becomes thinner and the maximum temperature is higher; the penetration of oxygen into the fuel as well as fuel consumption is also increased. It is noteworthy that most of the pollutants produced are NOx, which are strongly temperature dependent. The amount of these pollutants rises when the temperature is increased. As a solution, decreasing the air velocity can decrease the amount of these pollutants. Finally, comparing the result of this study and the other work, which considers constant properties, shows that the variable properties assumption leads to obtaining more exact solution but the trends of both results are similar.http://www.degruyter.com/view/j/meceng.2016.63.issue-3/meceng-2016-0020/meceng-2016-0020.xml?format=INTturbulent flamemethane-airnon-premixedlength of flameflame temperature |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Namazian Zafar Hashemi Heidar Namazian Farideh |
spellingShingle |
Namazian Zafar Hashemi Heidar Namazian Farideh Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames Archive of Mechanical Engineering turbulent flame methane-air non-premixed length of flame flame temperature |
author_facet |
Namazian Zafar Hashemi Heidar Namazian Farideh |
author_sort |
Namazian Zafar |
title |
Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames |
title_short |
Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames |
title_full |
Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames |
title_fullStr |
Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames |
title_full_unstemmed |
Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames |
title_sort |
investigation on effect of air velocity in turbulent non-premixed flames |
publisher |
Polish Academy of Sciences |
series |
Archive of Mechanical Engineering |
issn |
2300-1895 |
publishDate |
2016-09-01 |
description |
In this study, the turbulent non-premixed methane-air flame is simulated to determine the effect of air velocity on the length of flame, temperature distribution and mole fraction of species. The computational fluid dynamics (CFD) technique is used to perform this simulation. To solve the turbulence flow, k-ε model is used. In contrast to the previous works, in this study, in each one of simulations the properties of materials are taken variable and then the results are compared. The results show that at a certain flow rate of fuel, by increasing the air velocity, similar to when the properties are constant, the width of the flame becomes thinner and the maximum temperature is higher; the penetration of oxygen into the fuel as well as fuel consumption is also increased. It is noteworthy that most of the pollutants produced are NOx, which are strongly temperature dependent. The amount of these pollutants rises when the temperature is increased. As a solution, decreasing the air velocity can decrease the amount of these pollutants. Finally, comparing the result of this study and the other work, which considers constant properties, shows that the variable properties assumption leads to obtaining more exact solution but the trends of both results are similar. |
topic |
turbulent flame methane-air non-premixed length of flame flame temperature |
url |
http://www.degruyter.com/view/j/meceng.2016.63.issue-3/meceng-2016-0020/meceng-2016-0020.xml?format=INT |
work_keys_str_mv |
AT namazianzafar investigationoneffectofairvelocityinturbulentnonpremixedflames AT hashemiheidar investigationoneffectofairvelocityinturbulentnonpremixedflames AT namazianfarideh investigationoneffectofairvelocityinturbulentnonpremixedflames |
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