Blade Tip Leakage Flow and Heat Transfer with Pressure-Side Winglet
A numerical study has been conducted to explore the effect of a pressure-side winglet on the flow and heat transfer over a blade tip. Calculations are performed for both a flat tip and a squealer tip. The winglet is in the form of a flat extension, and is shaped in the axial chord direction to have...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2006-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/IJRM/2006/17079 |
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| _version_ | 1832552253660069888 |
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| author | A. K. Saha Sumanta Acharya Ron Bunker Chander Prakash |
| author_facet | A. K. Saha Sumanta Acharya Ron Bunker Chander Prakash |
| author_sort | A. K. Saha |
| collection | DOAJ |
| description | A numerical study has been conducted to explore the effect of a
pressure-side winglet on the flow and heat transfer over a blade
tip. Calculations are performed for both a flat tip and a squealer
tip. The winglet is in the form of a flat extension, and is shaped
in the axial chord direction to have the maximum thickness at the
chord location, where the pressure difference is the largest
between the pressure and suction sides. For the flat tip, the
pressure-side winglet exhibits a significant reduction in the
leakage flow strength. The low heat transfer coefficient
“sweet-spot” region is larger with the pressure-side winglet,
and lower heat transfer coefficients are also observed along the
pressure side of the blade. For the flat tip, the winglet reduces
the heat transfer coefficient locally by as much as 30%, while
the average heat transfer coefficient is reduced by about 7%.
In the presence of a squealer, the role of the winglet decreases
significantly, and a 5% reduction in the pressure loss
coefficient is achieved with the winglet with virtually no
reduction in the average heat transfer coefficient. On the other
hand, the suction-side squealer with constant width winglet shows
lower heat transfer (reduction of 5.5%) and pressure loss
coefficient (reduction of 26%) than its baseline counterpart. |
| format | Article |
| id | doaj-art-c439ae53d70e4e518ff25507f287c464 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2006-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-c439ae53d70e4e518ff25507f287c4642025-02-03T05:59:13ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342006-01-01200610.1155/IJRM/2006/1707917079Blade Tip Leakage Flow and Heat Transfer with Pressure-Side WingletA. K. Saha0Sumanta Acharya1Ron Bunker2Chander Prakash3Turbine Innovation and Energy Research (TIER) Center, Louisiana State University, Baton Rouge, LA, USATurbine Innovation and Energy Research (TIER) Center, Louisiana State University, Baton Rouge, LA, USAGeneral Electric Global Research, Niskayuna, NY 12309, USAGeneral Electric Aircraft Engines, Cincinnati, OH 45215, USAA numerical study has been conducted to explore the effect of a pressure-side winglet on the flow and heat transfer over a blade tip. Calculations are performed for both a flat tip and a squealer tip. The winglet is in the form of a flat extension, and is shaped in the axial chord direction to have the maximum thickness at the chord location, where the pressure difference is the largest between the pressure and suction sides. For the flat tip, the pressure-side winglet exhibits a significant reduction in the leakage flow strength. The low heat transfer coefficient “sweet-spot” region is larger with the pressure-side winglet, and lower heat transfer coefficients are also observed along the pressure side of the blade. For the flat tip, the winglet reduces the heat transfer coefficient locally by as much as 30%, while the average heat transfer coefficient is reduced by about 7%. In the presence of a squealer, the role of the winglet decreases significantly, and a 5% reduction in the pressure loss coefficient is achieved with the winglet with virtually no reduction in the average heat transfer coefficient. On the other hand, the suction-side squealer with constant width winglet shows lower heat transfer (reduction of 5.5%) and pressure loss coefficient (reduction of 26%) than its baseline counterpart.http://dx.doi.org/10.1155/IJRM/2006/17079 |
| spellingShingle | A. K. Saha Sumanta Acharya Ron Bunker Chander Prakash Blade Tip Leakage Flow and Heat Transfer with Pressure-Side Winglet International Journal of Rotating Machinery |
| title | Blade Tip Leakage Flow and Heat Transfer with Pressure-Side Winglet |
| title_full | Blade Tip Leakage Flow and Heat Transfer with Pressure-Side Winglet |
| title_fullStr | Blade Tip Leakage Flow and Heat Transfer with Pressure-Side Winglet |
| title_full_unstemmed | Blade Tip Leakage Flow and Heat Transfer with Pressure-Side Winglet |
| title_short | Blade Tip Leakage Flow and Heat Transfer with Pressure-Side Winglet |
| title_sort | blade tip leakage flow and heat transfer with pressure side winglet |
| url | http://dx.doi.org/10.1155/IJRM/2006/17079 |
| work_keys_str_mv | AT aksaha bladetipleakageflowandheattransferwithpressuresidewinglet AT sumantaacharya bladetipleakageflowandheattransferwithpressuresidewinglet AT ronbunker bladetipleakageflowandheattransferwithpressuresidewinglet AT chanderprakash bladetipleakageflowandheattransferwithpressuresidewinglet |