Advanced

Conjugate Heat Transfer Enhancement Of An Internal Blade Pin-Finned Tip-Wall

Xie, Gongnan LU and Sundén, Bengt LU (2010) ASME International Mechanical Engineering Congress and Exposition, 2009 In IMECE 2009: Proceedings of the ASME International Mechanical Engineering Congress and Exposition, Vol 9, Pts A-C p.2113-2122
Abstract
To improve gas turbine performance, the operating temperature has been increased continuously. However, the heat transferred to the turbine blade is substantially increased as the turbine inlet temperature is increased. Cooling methods are therefore needed for the turbine blades to ensure a long durability and safe operation. The blade tip region is exposed to the hot gas flow and is difficult to cool. A common way to cool the 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. Increasing internal convective cooling is therefore required to increase the blade tip life. In this paper, augmented heat transfer of a blade tip with internal... (More)
To improve gas turbine performance, the operating temperature has been increased continuously. However, the heat transferred to the turbine blade is substantially increased as the turbine inlet temperature is increased. Cooling methods are therefore needed for the turbine blades to ensure a long durability and safe operation. The blade tip region is exposed to the hot gas flow and is difficult to cool. A common way to cool the 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. Increasing internal convective cooling is therefore required to increase the blade tip life. In this paper, augmented heat transfer of a blade tip with internal pin-fins has been investigated numerically using a conjugate heat transfer approach. The computational model consists of a two-pass channel with 180-deg turn and an array of pin-fins mounted on the tip-cap. The computational domain includes the fluid region and the solid pins as well as the solid tip regions. Turbulent convective heat transfer between the fluid and pins, and heat conduction within pins and tip are simultaneously computed. The inlet Reynolds numbers are ranging from 100,000 to 600,000. Details of the 3D fluid flow and heat transfer over the tip surface are presented. A comparison of the overall performance of the two models is presented. It is found that due to the combination of turning impingement and pin-fin cross flow, the heat transfer coefficient of the pin-finned tip is a factor of about 3.0 higher than that of a smooth tip. This augmentation is achieved at the cost of a pressure drop penalty of about 7%. With the conjugate heat transfer method, not only the simulated model is close to the experimental model, but also the distribution of the external tip heat transfer can be relevant for thermal design of turbine blade tips. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Conjugate, Heat transfer, Tip-wall, Pin-fins
in
IMECE 2009: Proceedings of the ASME International Mechanical Engineering Congress and Exposition, Vol 9, Pts A-C
pages
2113 - 2122
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME International Mechanical Engineering Congress and Exposition, 2009
external identifiers
  • WOS:000280196300241
  • Scopus:77954274586
language
English
LU publication?
yes
id
0e00e2c1-717d-48f0-93fe-b4ea36e84742 (old id 1654500)
date added to LUP
2010-08-26 13:00:36
date last changed
2017-01-01 08:06:31
@inproceedings{0e00e2c1-717d-48f0-93fe-b4ea36e84742,
  abstract     = {To improve gas turbine performance, the operating temperature has been increased continuously. However, the heat transferred to the turbine blade is substantially increased as the turbine inlet temperature is increased. Cooling methods are therefore needed for the turbine blades to ensure a long durability and safe operation. The blade tip region is exposed to the hot gas flow and is difficult to cool. A common way to cool the 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. Increasing internal convective cooling is therefore required to increase the blade tip life. In this paper, augmented heat transfer of a blade tip with internal pin-fins has been investigated numerically using a conjugate heat transfer approach. The computational model consists of a two-pass channel with 180-deg turn and an array of pin-fins mounted on the tip-cap. The computational domain includes the fluid region and the solid pins as well as the solid tip regions. Turbulent convective heat transfer between the fluid and pins, and heat conduction within pins and tip are simultaneously computed. The inlet Reynolds numbers are ranging from 100,000 to 600,000. Details of the 3D fluid flow and heat transfer over the tip surface are presented. A comparison of the overall performance of the two models is presented. It is found that due to the combination of turning impingement and pin-fin cross flow, the heat transfer coefficient of the pin-finned tip is a factor of about 3.0 higher than that of a smooth tip. This augmentation is achieved at the cost of a pressure drop penalty of about 7%. With the conjugate heat transfer method, not only the simulated model is close to the experimental model, but also the distribution of the external tip heat transfer can be relevant for thermal design of turbine blade tips.},
  author       = {Xie, Gongnan and Sundén, Bengt},
  booktitle    = {IMECE 2009: Proceedings of the ASME International Mechanical Engineering Congress and Exposition, Vol 9, Pts A-C},
  keyword      = {Conjugate,Heat transfer,Tip-wall,Pin-fins},
  language     = {eng},
  pages        = {2113--2122},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Conjugate Heat Transfer Enhancement Of An Internal Blade Pin-Finned Tip-Wall},
  year         = {2010},
}