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Journal of Enhanced Heat Transfer
Главный редактор: Zhixiong Guo (open in a new tab)
Founding Advisory Editor: Arthur E. Bergles (open in a new tab)
Редактор-основатель: Ralph L. Webb (open in a new tab)

Выходит 8 номеров в год

ISSN Печать: 1065-5131

ISSN Онлайн: 1563-5074

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 2.3 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.8 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.2 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00037 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.6 SJR: 0.433 SNIP: 0.593 CiteScore™:: 4.3 H-Index: 35

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CONJUGATED ANALYSIS OF HEAT TRANSFER ENHANCEMENT OF AN INTERNAL BLADE TIP-WALL WITH PIN-FIN ARRAYS

Том 18, Выпуск 2, 2011, pp. 149-165
DOI: 10.1615/JEnhHeatTransf.v18.i2.60
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Краткое описание

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, much needed for the turbine blades to ensure long durability and safe operation. The blade tip region is exposed to hot gas flow, and is difficult to cool. A common way to cool the tip is to use serpentine passages with 180-degree turns under the blade tip-cap, taking advantage of the three-dimensional (3D) turning effect and impingement. Increased internal convective cooling is, however, 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 conjugated heat transfer approach. The computational models consist of two-pass channels with 180-degree turns and pin-fin arrays mounted on the internal tip caps. 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 the pins and tip are simultaneously computed. The inlet Reynolds number ranges from 100,000 to 600,000. Details of the 3D fluid flow and heat transfer over the tip-walls are presented. A comparison of the overall performance of the models is presented. It was found that due to the combination of turning impingement and pin-fin crossflow, the heat transfer coefficient of the pin-finned tip is about three times higher than that of a smooth tip. This augmentation is achieved at the cost of a pressure drop penalty of 7%. With the conjugated heat transfer method, not only the simulated model is close to the experimental model, but also the distribution of the external tip heat transfer and pin-fin surface heat flux can be used in the thermal design of blade tips.

Ключевые слова: tip-wall, pin-fins, heat transfer, conjugated
ЦИТИРОВАНО В
  1. Xie Gongnan, Zhang Weihong, Sunden Bengt, Computational analysis of the influences of guide ribs/vanes on enhanced heat transfer of a turbine blade tip-wall, International Journal of Thermal Sciences, 51, 2012. Crossref

  2. Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Heat Transfer Fundamentals for Design of Heat Transfer Enhancement Devices, in Introduction to Enhanced Heat Transfer, 2020. Crossref

  3. Sun Hongchuang, Qin Jiang, Huang Hongyan, Yan Peigang, Numerical Simulation of Flow and Heat Transfer in a Square Rotating U-Duct Using Hydrocarbon Fuel, Journal of Heat Transfer, 141, 3, 2019. Crossref

  4. Sun Hongchuang, Qin Jiang, Huang Hongyan, Yan Peigang, Investigation of hydrocarbon fuel rotating flow considering the variation of physical properties, International Journal of Heat and Mass Transfer, 142, 2019. Crossref

  5. Zhao Zhiqi, Luo Lei, Qiu Dandan, Wang Songtao, Wang Zhongqi, Sundén Bengt, Vortical structures and heat transfer augmentation of a cooling channel in a gas turbine blade with various arrangements of tip bleed holes, Numerical Heat Transfer, Part A: Applications, 79, 1, 2021. Crossref

  6. Zhao Zhiqi, Luo Lei, Qiu Dandan, Wang Songtao, Wang Zhongqi, Sundén Bengt, Influence of spacing of a delta-winglet vortex generator pair on the flow behavior and heat transfer at the internal tip of gas turbine blades, International Journal of Thermal Sciences, 175, 2022. Crossref

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