Characteristics of a co-flowing jet with varying lip thickness and constant bypass ratio
Purpose Subsonic commercial aircraft operate with turbo-fan engines that operate with moderate bypass ratio (BR) co-flowing jets (CFJ). This study aims to analyse CFJ with constant BR 6.3 and varying primary nozzle lip thickness (LT) to find a critical LT in CFJ below which mixing enhances and beyon...
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| Veröffentlicht in: | Aircraft engineering 2019-10, Vol.91 (9), p.1205-1213 |
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| container_title | Aircraft engineering |
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| creator | R, Naren Shankar S, Kevin Bennett |
| description | Purpose
Subsonic commercial aircraft operate with turbo-fan engines that operate with moderate bypass ratio (BR) co-flowing jets (CFJ). This study aims to analyse CFJ with constant BR 6.3 and varying primary nozzle lip thickness (LT) to find a critical LT in CFJ below which mixing enhances and beyond which mixing inhibits.
Design/methodology/approach
CFJ were characterized with a constant BR of 6.3 and varying lip thicknesses. A single free jet with a diameter equal to that of a primary nozzle of the co-flowing jet was also studied for comparison.
Findings
The results show that within a critical limit, the mixing enhanced with an increase in LT. This was signified by a reduction in potential core length (PCL). Beyond this limit, mixing inhibited leading to the elongation of PCL. This limit was controlled by parameters such as LT and magnitude of BR.
Practical implications
The BR value of CFJ in the present study was 6.3. This lies under the moderate BR value at which subsonic commercial turbofan operates. Hence, it becomes impervious to study its mixing behavior.
Originality/value
This is the first effort to find the critical value of LT for a constant BR for compressible co-flow jets. The CFJ with moderate BR and varying LT has not been studied in the past. The present study focuses on finding a critical LT below which mixing enhances and above which mixing inhibits. |
| doi_str_mv | 10.1108/AEAT-01-2019-0007 |
| format | Article |
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Subsonic commercial aircraft operate with turbo-fan engines that operate with moderate bypass ratio (BR) co-flowing jets (CFJ). This study aims to analyse CFJ with constant BR 6.3 and varying primary nozzle lip thickness (LT) to find a critical LT in CFJ below which mixing enhances and beyond which mixing inhibits.
Design/methodology/approach
CFJ were characterized with a constant BR of 6.3 and varying lip thicknesses. A single free jet with a diameter equal to that of a primary nozzle of the co-flowing jet was also studied for comparison.
Findings
The results show that within a critical limit, the mixing enhanced with an increase in LT. This was signified by a reduction in potential core length (PCL). Beyond this limit, mixing inhibited leading to the elongation of PCL. This limit was controlled by parameters such as LT and magnitude of BR.
Practical implications
The BR value of CFJ in the present study was 6.3. This lies under the moderate BR value at which subsonic commercial turbofan operates. Hence, it becomes impervious to study its mixing behavior.
Originality/value
This is the first effort to find the critical value of LT for a constant BR for compressible co-flow jets. The CFJ with moderate BR and varying LT has not been studied in the past. The present study focuses on finding a critical LT below which mixing enhances and above which mixing inhibits.</description><identifier>ISSN: 1748-8842</identifier><identifier>EISSN: 1758-4213</identifier><identifier>DOI: 10.1108/AEAT-01-2019-0007</identifier><language>eng</language><publisher>Bradford: Emerald Publishing Limited</publisher><subject>Aircraft engines ; Bypass ratio ; Commercial aircraft ; Compressibility ; Elongation ; Fluid dynamics ; Free jets ; Jet aircraft ; Laboratories ; Noise ; Nozzles ; Numerical analysis ; Studies ; Subsonic aircraft ; Thickness ; Turbofans ; Velocity ; Vortices</subject><ispartof>Aircraft engineering, 2019-10, Vol.91 (9), p.1205-1213</ispartof><rights>Emerald Publishing Limited</rights><rights>Emerald Publishing Limited 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c362t-c8279363678982ef126de5177e2f45ae3af9c722d54e2a4429feb73b4c1c73d03</citedby><cites>FETCH-LOGICAL-c362t-c8279363678982ef126de5177e2f45ae3af9c722d54e2a4429feb73b4c1c73d03</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,967,27924,27925</link.rule.ids></links><search><creatorcontrib>R, Naren Shankar</creatorcontrib><creatorcontrib>S, Kevin Bennett</creatorcontrib><title>Characteristics of a co-flowing jet with varying lip thickness and constant bypass ratio</title><title>Aircraft engineering</title><description>Purpose
Subsonic commercial aircraft operate with turbo-fan engines that operate with moderate bypass ratio (BR) co-flowing jets (CFJ). This study aims to analyse CFJ with constant BR 6.3 and varying primary nozzle lip thickness (LT) to find a critical LT in CFJ below which mixing enhances and beyond which mixing inhibits.
Design/methodology/approach
CFJ were characterized with a constant BR of 6.3 and varying lip thicknesses. A single free jet with a diameter equal to that of a primary nozzle of the co-flowing jet was also studied for comparison.
Findings
The results show that within a critical limit, the mixing enhanced with an increase in LT. This was signified by a reduction in potential core length (PCL). Beyond this limit, mixing inhibited leading to the elongation of PCL. This limit was controlled by parameters such as LT and magnitude of BR.
Practical implications
The BR value of CFJ in the present study was 6.3. This lies under the moderate BR value at which subsonic commercial turbofan operates. Hence, it becomes impervious to study its mixing behavior.
Originality/value
This is the first effort to find the critical value of LT for a constant BR for compressible co-flow jets. The CFJ with moderate BR and varying LT has not been studied in the past. The present study focuses on finding a critical LT below which mixing enhances and above which mixing inhibits.</description><subject>Aircraft engines</subject><subject>Bypass ratio</subject><subject>Commercial aircraft</subject><subject>Compressibility</subject><subject>Elongation</subject><subject>Fluid dynamics</subject><subject>Free jets</subject><subject>Jet aircraft</subject><subject>Laboratories</subject><subject>Noise</subject><subject>Nozzles</subject><subject>Numerical analysis</subject><subject>Studies</subject><subject>Subsonic aircraft</subject><subject>Thickness</subject><subject>Turbofans</subject><subject>Velocity</subject><subject>Vortices</subject><issn>1748-8842</issn><issn>1758-4213</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNptkE9LAzEQxYMoWKsfwFvAczSZZDfZYyn1DxS8VPAW0mxiU7e7a5Ja-u3dpV4ETzM83pvh_RC6ZfSeMaoeZovZilBGgLKKUErlGZowWSgigPHzcReKKCXgEl2ltKWUlQXlE_Q-35hobHYxpBxswp3HBtuO-KY7hPYDb13Gh5A3-NvE4yg0ocd5E-xn61LCpq0Hd5uyaTNeH3szaNHk0F2jC2-a5G5-5xS9PS5W82eyfH16mc-WxPISMrEKZMVLXkpVKXCeQVm7gknpwIvCOG58ZSVAXQgHRgiovFtLvhaWWclryqfo7nS3j93X3qWst90-tsNLDVAxUBwGAlPETi4bu5Si87qPYTc00ozqEaAeAWrK9AhQjwCHDD1l3M5F09T_Rv4w5z8g9nGo</recordid><startdate>20191007</startdate><enddate>20191007</enddate><creator>R, Naren Shankar</creator><creator>S, Kevin Bennett</creator><general>Emerald Publishing Limited</general><general>Emerald Group Publishing Limited</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7RQ</scope><scope>7TB</scope><scope>7WY</scope><scope>7XB</scope><scope>8AF</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BEZIV</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>F28</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>H8D</scope><scope>HCIFZ</scope><scope>K6~</scope><scope>KB.</scope><scope>L.-</scope><scope>L6V</scope><scope>L7M</scope><scope>M0F</scope><scope>M1Q</scope><scope>M2P</scope><scope>M7S</scope><scope>P5Z</scope><scope>P62</scope><scope>PDBOC</scope><scope>PQBIZ</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>Q9U</scope></search><sort><creationdate>20191007</creationdate><title>Characteristics of a co-flowing jet with varying lip thickness and constant bypass ratio</title><author>R, Naren Shankar ; S, Kevin Bennett</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c362t-c8279363678982ef126de5177e2f45ae3af9c722d54e2a4429feb73b4c1c73d03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Aircraft engines</topic><topic>Bypass ratio</topic><topic>Commercial aircraft</topic><topic>Compressibility</topic><topic>Elongation</topic><topic>Fluid dynamics</topic><topic>Free jets</topic><topic>Jet aircraft</topic><topic>Laboratories</topic><topic>Noise</topic><topic>Nozzles</topic><topic>Numerical analysis</topic><topic>Studies</topic><topic>Subsonic aircraft</topic><topic>Thickness</topic><topic>Turbofans</topic><topic>Velocity</topic><topic>Vortices</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>R, Naren Shankar</creatorcontrib><creatorcontrib>S, Kevin Bennett</creatorcontrib><collection>CrossRef</collection><collection>Career & Technical Education Database</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Access via ABI/INFORM (ProQuest)</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>STEM Database</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Business Premium Collection</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>ProQuest Central Student</collection><collection>Aerospace Database</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Business Collection</collection><collection>Materials Science Database</collection><collection>ABI/INFORM Professional Advanced</collection><collection>ProQuest Engineering Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>ABI/INFORM Trade & Industry</collection><collection>Military Database</collection><collection>Science Database</collection><collection>Engineering Database</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Materials Science Collection</collection><collection>ProQuest One Business</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Engineering Collection</collection><collection>ProQuest Central Basic</collection><jtitle>Aircraft engineering</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>R, Naren Shankar</au><au>S, Kevin Bennett</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characteristics of a co-flowing jet with varying lip thickness and constant bypass ratio</atitle><jtitle>Aircraft engineering</jtitle><date>2019-10-07</date><risdate>2019</risdate><volume>91</volume><issue>9</issue><spage>1205</spage><epage>1213</epage><pages>1205-1213</pages><issn>1748-8842</issn><eissn>1758-4213</eissn><abstract>Purpose
Subsonic commercial aircraft operate with turbo-fan engines that operate with moderate bypass ratio (BR) co-flowing jets (CFJ). This study aims to analyse CFJ with constant BR 6.3 and varying primary nozzle lip thickness (LT) to find a critical LT in CFJ below which mixing enhances and beyond which mixing inhibits.
Design/methodology/approach
CFJ were characterized with a constant BR of 6.3 and varying lip thicknesses. A single free jet with a diameter equal to that of a primary nozzle of the co-flowing jet was also studied for comparison.
Findings
The results show that within a critical limit, the mixing enhanced with an increase in LT. This was signified by a reduction in potential core length (PCL). Beyond this limit, mixing inhibited leading to the elongation of PCL. This limit was controlled by parameters such as LT and magnitude of BR.
Practical implications
The BR value of CFJ in the present study was 6.3. This lies under the moderate BR value at which subsonic commercial turbofan operates. Hence, it becomes impervious to study its mixing behavior.
Originality/value
This is the first effort to find the critical value of LT for a constant BR for compressible co-flow jets. The CFJ with moderate BR and varying LT has not been studied in the past. The present study focuses on finding a critical LT below which mixing enhances and above which mixing inhibits.</abstract><cop>Bradford</cop><pub>Emerald Publishing Limited</pub><doi>10.1108/AEAT-01-2019-0007</doi><tpages>9</tpages></addata></record> |
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| ispartof | Aircraft engineering, 2019-10, Vol.91 (9), p.1205-1213 |
| issn | 1748-8842 1758-4213 |
| language | eng |
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| source | Emerald A-Z Current Journals |
| subjects | Aircraft engines Bypass ratio Commercial aircraft Compressibility Elongation Fluid dynamics Free jets Jet aircraft Laboratories Noise Nozzles Numerical analysis Studies Subsonic aircraft Thickness Turbofans Velocity Vortices |
| title | Characteristics of a co-flowing jet with varying lip thickness and constant bypass ratio |
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