On the Stability of a Turbulent Non-Premixed Methane Flame
This paper presents an experimental qualitative assessment of the stability of a turbulent, non-premixed methane flame. The burner consists of a central fuel nozzle surrounded by an annulus of co-airflow with varying swirl strength. Two distinct nozzle geometries having similar exit cross-sectional...
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| Veröffentlicht in: | Combustion science and technology 2009-11, Vol.181 (12), p.1443-1463 |
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| creator | Iyogun, C. O. Birouk, M. |
| description | This paper presents an experimental qualitative assessment of the stability of a turbulent, non-premixed methane flame. The burner consists of a central fuel nozzle surrounded by an annulus of co-airflow with varying swirl strength. Two distinct nozzle geometries having similar exit cross-sectional areas but different internal/orifice geometry-a rectangular and a contracted circular nozzle-were tested. They are referred to in this paper as RN and CCN, respectively. The main focus of the present study was on determining the flame liftoff and blowout velocities as well as the liftoff height and flame length, all of which can be used as indicators of the stability of non-premixed methane flame. The experimental data revealed that the blowout velocity of the RN nozzle's flame is remarkably higher than that of the CCN nozzle, and the liftoff velocity of the CCN is only slightly higher than that of the RN nozzle for identical swirl strength. In addition, the flame length of the RN nozzle is overall shorter than that of the CCN nozzle for identical test conditions, and the liftoff height of the CCN flame is higher than that of the RN flame. LDV velocity measurements were performed to determine the reacting flow overall dynamic along the centerline plane for typical jet and co-flow exit velocities. These results aimed at helping to explain the difference in flame stability between the two different nozzles' geometries in conjunction with the co-flow swirl strength. |
| doi_str_mv | 10.1080/00102200903182742 |
| format | Article |
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O. ; Birouk, M.</creator><creatorcontrib>Iyogun, C. O. ; Birouk, M.</creatorcontrib><description>This paper presents an experimental qualitative assessment of the stability of a turbulent, non-premixed methane flame. The burner consists of a central fuel nozzle surrounded by an annulus of co-airflow with varying swirl strength. Two distinct nozzle geometries having similar exit cross-sectional areas but different internal/orifice geometry-a rectangular and a contracted circular nozzle-were tested. They are referred to in this paper as RN and CCN, respectively. The main focus of the present study was on determining the flame liftoff and blowout velocities as well as the liftoff height and flame length, all of which can be used as indicators of the stability of non-premixed methane flame. The experimental data revealed that the blowout velocity of the RN nozzle's flame is remarkably higher than that of the CCN nozzle, and the liftoff velocity of the CCN is only slightly higher than that of the RN nozzle for identical swirl strength. In addition, the flame length of the RN nozzle is overall shorter than that of the CCN nozzle for identical test conditions, and the liftoff height of the CCN flame is higher than that of the RN flame. LDV velocity measurements were performed to determine the reacting flow overall dynamic along the centerline plane for typical jet and co-flow exit velocities. These results aimed at helping to explain the difference in flame stability between the two different nozzles' geometries in conjunction with the co-flow swirl strength.</description><identifier>ISSN: 0010-2202</identifier><identifier>EISSN: 1563-521X</identifier><identifier>DOI: 10.1080/00102200903182742</identifier><identifier>CODEN: CBSTB9</identifier><language>eng</language><publisher>Philadelphia, PA: Taylor & Francis Group</publisher><subject>Applied sciences ; Blowout ; Co-flow ; Combustion of gaseous fuels ; Combustion. Flame ; Energy ; Energy. Thermal use of fuels ; Exact sciences and technology ; Flame length ; Fluid dynamics ; Geometry ; LDV ; Liftoff ; Methane ; Non-premixed flame ; Oxidation ; Swirl ; Theoretical studies. Data and constants. 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O.</creatorcontrib><creatorcontrib>Birouk, M.</creatorcontrib><title>On the Stability of a Turbulent Non-Premixed Methane Flame</title><title>Combustion science and technology</title><description>This paper presents an experimental qualitative assessment of the stability of a turbulent, non-premixed methane flame. The burner consists of a central fuel nozzle surrounded by an annulus of co-airflow with varying swirl strength. Two distinct nozzle geometries having similar exit cross-sectional areas but different internal/orifice geometry-a rectangular and a contracted circular nozzle-were tested. They are referred to in this paper as RN and CCN, respectively. The main focus of the present study was on determining the flame liftoff and blowout velocities as well as the liftoff height and flame length, all of which can be used as indicators of the stability of non-premixed methane flame. The experimental data revealed that the blowout velocity of the RN nozzle's flame is remarkably higher than that of the CCN nozzle, and the liftoff velocity of the CCN is only slightly higher than that of the RN nozzle for identical swirl strength. In addition, the flame length of the RN nozzle is overall shorter than that of the CCN nozzle for identical test conditions, and the liftoff height of the CCN flame is higher than that of the RN flame. LDV velocity measurements were performed to determine the reacting flow overall dynamic along the centerline plane for typical jet and co-flow exit velocities. These results aimed at helping to explain the difference in flame stability between the two different nozzles' geometries in conjunction with the co-flow swirl strength.</description><subject>Applied sciences</subject><subject>Blowout</subject><subject>Co-flow</subject><subject>Combustion of gaseous fuels</subject><subject>Combustion. Flame</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Exact sciences and technology</subject><subject>Flame length</subject><subject>Fluid dynamics</subject><subject>Geometry</subject><subject>LDV</subject><subject>Liftoff</subject><subject>Methane</subject><subject>Non-premixed flame</subject><subject>Oxidation</subject><subject>Swirl</subject><subject>Theoretical studies. Data and constants. 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O.</creator><creator>Birouk, M.</creator><general>Taylor & Francis Group</general><general>Taylor & Francis</general><general>Taylor & Francis Ltd</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20091130</creationdate><title>On the Stability of a Turbulent Non-Premixed Methane Flame</title><author>Iyogun, C. O. ; Birouk, M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c469t-e8c8864da3c7ca4b3ae32ec2a40e571a1443c6afa8c890ba1f5ecba21aa6d88b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Applied sciences</topic><topic>Blowout</topic><topic>Co-flow</topic><topic>Combustion of gaseous fuels</topic><topic>Combustion. Flame</topic><topic>Energy</topic><topic>Energy. Thermal use of fuels</topic><topic>Exact sciences and technology</topic><topic>Flame length</topic><topic>Fluid dynamics</topic><topic>Geometry</topic><topic>LDV</topic><topic>Liftoff</topic><topic>Methane</topic><topic>Non-premixed flame</topic><topic>Oxidation</topic><topic>Swirl</topic><topic>Theoretical studies. Data and constants. Metering</topic><topic>Turbulence</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Iyogun, C. O.</creatorcontrib><creatorcontrib>Birouk, M.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Combustion science and technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Iyogun, C. O.</au><au>Birouk, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>On the Stability of a Turbulent Non-Premixed Methane Flame</atitle><jtitle>Combustion science and technology</jtitle><date>2009-11-30</date><risdate>2009</risdate><volume>181</volume><issue>12</issue><spage>1443</spage><epage>1463</epage><pages>1443-1463</pages><issn>0010-2202</issn><eissn>1563-521X</eissn><coden>CBSTB9</coden><abstract>This paper presents an experimental qualitative assessment of the stability of a turbulent, non-premixed methane flame. The burner consists of a central fuel nozzle surrounded by an annulus of co-airflow with varying swirl strength. Two distinct nozzle geometries having similar exit cross-sectional areas but different internal/orifice geometry-a rectangular and a contracted circular nozzle-were tested. They are referred to in this paper as RN and CCN, respectively. The main focus of the present study was on determining the flame liftoff and blowout velocities as well as the liftoff height and flame length, all of which can be used as indicators of the stability of non-premixed methane flame. The experimental data revealed that the blowout velocity of the RN nozzle's flame is remarkably higher than that of the CCN nozzle, and the liftoff velocity of the CCN is only slightly higher than that of the RN nozzle for identical swirl strength. In addition, the flame length of the RN nozzle is overall shorter than that of the CCN nozzle for identical test conditions, and the liftoff height of the CCN flame is higher than that of the RN flame. LDV velocity measurements were performed to determine the reacting flow overall dynamic along the centerline plane for typical jet and co-flow exit velocities. These results aimed at helping to explain the difference in flame stability between the two different nozzles' geometries in conjunction with the co-flow swirl strength.</abstract><cop>Philadelphia, PA</cop><pub>Taylor & Francis Group</pub><doi>10.1080/00102200903182742</doi><tpages>21</tpages></addata></record> |
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| ispartof | Combustion science and technology, 2009-11, Vol.181 (12), p.1443-1463 |
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| source | Taylor & Francis Journals Complete |
| subjects | Applied sciences Blowout Co-flow Combustion of gaseous fuels Combustion. Flame Energy Energy. Thermal use of fuels Exact sciences and technology Flame length Fluid dynamics Geometry LDV Liftoff Methane Non-premixed flame Oxidation Swirl Theoretical studies. Data and constants. Metering Turbulence |
| title | On the Stability of a Turbulent Non-Premixed Methane Flame |
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