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Détail de l'auteur
Auteur Bengt Sundén
Documents disponibles écrits par cet auteur
Affiner la rechercheComparisons of pins/dimples/protrusions cooling concepts for a turbine blade tip-wall at high Reynolds numbers / Gongnan Xie in Journal of heat transfer, Vol. 133 N° 6 (Juin 2011)
[article]
in Journal of heat transfer > Vol. 133 N° 6 (Juin 2011) . - pp. [061902/1-9]
Titre : Comparisons of pins/dimples/protrusions cooling concepts for a turbine blade tip-wall at high Reynolds numbers Type de document : texte imprimé Auteurs : Gongnan Xie, Auteur ; Bengt Sundén, Auteur ; Weihong Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. [061902/1-9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Heat transfer enhancement Blade tip-wall Pins Dimples Protrusions Numerical simulation Index. décimale : 536 Chaleur. Thermodynamique Résumé : The blade tip region encounters high thermal loads because of the hot gas leakage flows, and it must therefore be cooled to ensure a long durability and safe operation. A common way to cool a blade tip is to design serpentine passages with a 180 deg turns under the blade tip-cap inside the turbine blade. Improved internal convective cooling is therefore required to increase blade tip lifetime. Pins, dimples, and protrusions are well recognized as effective devices to augment heat transfer in various applications. In this paper, enhanced heat transfer of an internal blade tip-wall has been predicted numerically. The computational models consist of a two-pass channel with 180 deg turn and arrays of circular pins, hemispherical dimples, or protrusions internally mounted on the tip-wall. Inlet Reynolds numbers are ranging from 100,000 to 600,000. The overall performance of the two-pass channels is evaluated. Numerical results show that the heat transfer enhancement of the pinned-tip is up to a factor of 3.0 higher than that of a smooth tip while the dimpled-tip and protruded-tip provide about 2.0 times higher heat transfer. These augmentations are achieved at the cost of an increase of pressure drop by less than 10%. By comparing the present cooling concepts with pins, dimples, and protrusions, it is shown that the pinned-tip exhibits best performance to improve the blade tip cooling. However, when disregarding the added active area and considering the added mechanical stress, it is suggested that the usage of dimples is more suitable to enhance blade tip cooling, especially at low Reynolds numbers.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Comparisons of pins/dimples/protrusions cooling concepts for a turbine blade tip-wall at high Reynolds numbers [texte imprimé] / Gongnan Xie, Auteur ; Bengt Sundén, Auteur ; Weihong Zhang, Auteur . - 2011 . - pp. [061902/1-9].
Physique
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 133 N° 6 (Juin 2011) . - pp. [061902/1-9]
Mots-clés : Heat transfer enhancement Blade tip-wall Pins Dimples Protrusions Numerical simulation Index. décimale : 536 Chaleur. Thermodynamique Résumé : The blade tip region encounters high thermal loads because of the hot gas leakage flows, and it must therefore be cooled to ensure a long durability and safe operation. A common way to cool a blade tip is to design serpentine passages with a 180 deg turns under the blade tip-cap inside the turbine blade. Improved internal convective cooling is therefore required to increase blade tip lifetime. Pins, dimples, and protrusions are well recognized as effective devices to augment heat transfer in various applications. In this paper, enhanced heat transfer of an internal blade tip-wall has been predicted numerically. The computational models consist of a two-pass channel with 180 deg turn and arrays of circular pins, hemispherical dimples, or protrusions internally mounted on the tip-wall. Inlet Reynolds numbers are ranging from 100,000 to 600,000. The overall performance of the two-pass channels is evaluated. Numerical results show that the heat transfer enhancement of the pinned-tip is up to a factor of 3.0 higher than that of a smooth tip while the dimpled-tip and protruded-tip provide about 2.0 times higher heat transfer. These augmentations are achieved at the cost of an increase of pressure drop by less than 10%. By comparing the present cooling concepts with pins, dimples, and protrusions, it is shown that the pinned-tip exhibits best performance to improve the blade tip cooling. However, when disregarding the added active area and considering the added mechanical stress, it is suggested that the usage of dimples is more suitable to enhance blade tip cooling, especially at low Reynolds numbers.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] Computational analysis of pin-fin arrays effects on internal heat transfer enhancement of a blade tip wall / Gongnan Xie in Journal of heat transfer, Vol. 132 N° 3 (Mars 2010)
[article]
in Journal of heat transfer > Vol. 132 N° 3 (Mars 2010) . - pp. [031901-1/11]
Titre : Computational analysis of pin-fin arrays effects on internal heat transfer enhancement of a blade tip wall Type de document : texte imprimé Auteurs : Gongnan Xie, Auteur ; Bengt Sundén, Auteur ; Esa Utriainen, Auteur Article en page(s) : pp. [031901-1/11] Note générale : Physique Langues : Anglais (eng) Mots-clés : Tip wall Pin fins Enhancement Computation Gas turbine cooling Index. décimale : 536 Chaleur. Thermodynamique Résumé : Cooling methods are strongly needed for the turbine blade tips to ensure a long durability and safe operation. Improving the internal convective cooling is therefore required to increase the blade tip life. A common way to cool the tip is to use serpentine passages with 180-deg turns under the blade tip cap. In this paper, enhanced heat transfer of a blade tip cap has been investigated numerically. The computational models consist of a two-pass channel with a 180-deg turn and various arrays of pin fins mounted on the tip cap, and a smooth two-pass channel. The inlet Reynolds number is ranging from 100,000 to 600,000. The computations are 3D, steady, incompressible, and nonrotating. Details of the 3D fluid flow and heat transfer over the tip walls are presented. The effects of pin-fin height, diameter, and pitches on the heat transfer enhancement on the blade tip walls are observed. The overall performances of ten models are compared and evaluated. It is found that due to the combination of turning, impingement, and pin-fin crossflow, the heat transfer coefficient of the pin-finned tip is a factor of 2.67 higher than that of a smooth tip. This augmentation is achieved at the expense of a penalty of pressure drop around 30%. Results show that the intensity of heat transfer enhancement depends upon pin-fin configuration and arrangement. It is suggested that pin fins could be used to enhance the blade tip heat transfer and cooling.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Computational analysis of pin-fin arrays effects on internal heat transfer enhancement of a blade tip wall [texte imprimé] / Gongnan Xie, Auteur ; Bengt Sundén, Auteur ; Esa Utriainen, Auteur . - pp. [031901-1/11].
Physique
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 132 N° 3 (Mars 2010) . - pp. [031901-1/11]
Mots-clés : Tip wall Pin fins Enhancement Computation Gas turbine cooling Index. décimale : 536 Chaleur. Thermodynamique Résumé : Cooling methods are strongly needed for the turbine blade tips to ensure a long durability and safe operation. Improving the internal convective cooling is therefore required to increase the blade tip life. A common way to cool the tip is to use serpentine passages with 180-deg turns under the blade tip cap. In this paper, enhanced heat transfer of a blade tip cap has been investigated numerically. The computational models consist of a two-pass channel with a 180-deg turn and various arrays of pin fins mounted on the tip cap, and a smooth two-pass channel. The inlet Reynolds number is ranging from 100,000 to 600,000. The computations are 3D, steady, incompressible, and nonrotating. Details of the 3D fluid flow and heat transfer over the tip walls are presented. The effects of pin-fin height, diameter, and pitches on the heat transfer enhancement on the blade tip walls are observed. The overall performances of ten models are compared and evaluated. It is found that due to the combination of turning, impingement, and pin-fin crossflow, the heat transfer coefficient of the pin-finned tip is a factor of 2.67 higher than that of a smooth tip. This augmentation is achieved at the expense of a penalty of pressure drop around 30%. Results show that the intensity of heat transfer enhancement depends upon pin-fin configuration and arrangement. It is suggested that pin fins could be used to enhance the blade tip heat transfer and cooling.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]