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Comparisons of Heat Transfer Enhancement of an Internal Blade Tip with Metal or Insulating Pins

Published online by Cambridge University Press:  03 June 2015

Gongnan Xie  and
Bengt Sundén
Gongnan Xie*
Affiliation:
The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China Division of Heat Transfer, Lund University, SE-22100, Lund, Sweden
Bengt Sundén*
Affiliation:
Division of Heat Transfer, Lund University, SE-22100, Lund, Sweden
*
Email: xgn@nwpu.edu.cn
Corresponding author. URL: http://www.ht.energy.lth.se/personal/bengt_sunden Email: Bengt.Sunden@energy.lth.se
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Abstract

Cooling methods are needed for turbine blade tips to ensure a long durability and safe operation. A common way to cool a tip is to use serpentine passages with 180-deg turn under the blade tip-cap taking advantage of the three-dimensional turning effect and impingement like flow. Improved internal convective cooling is therefore required to increase the blade tip lifetime. In the present study, augmented heat transfer of an internal blade tip with pin-fin arrays has been investigated numerically using a conjugate heat transfer method. The computational domain includes the fluid region and the solid pins as well as the tip regions. Turbulent convective heat transfer between the fluid and pins, and heat conduction within pins and tip are simultaneously computed. The main objective of the present study is to observe the effect of the pin material on heat transfer enhancement of the pin-finned tips. It is found that due to the combination of turning, impingement and pin-fin crossflow, the heat transfer coefficient of a pin-finned tip is a factor of 2.9 higher than that of a smooth tip at the cost of an increased pressure drop by less than 10%. The usage of metal pins can reduce the tip temperature effectively and thereby remove the heat load from the tip. Also, it is found that the tip heat transfer is enhanced even by using insulating pins having low thermal conductivity at low Reynolds numbers. The comparisons of overall performances are also included.

Keywords

76D1780A2035Q80Heat transfer enhancementtip-wallpinsthermal conductivityweight
Type
Research Article
Information
Advances in Applied Mathematics and Mechanics , Volume 3 , Issue 3 , June 2011 , pp. 297 - 309
Copyright
Copyright © Global-Science Press 2011

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