blade tip leakage flow and heat transfer with pressure-side winglet
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ID: 144835
2006
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Abstract
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.
| Reference Key |
saha2006internationalblade
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|---|---|
| Authors | ;A. K. Saha;Sumanta Acharya;Ron Bunker;Chander Prakash |
| Journal | ACS omega |
| Year | 2006 |
| DOI |
10.1155/IJRM/2006/17079
|
| URL | |
| Keywords |
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