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Heat Transfer Research

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ISSN Druckformat: 1064-2285

ISSN Online: 2162-6561

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: 1.7 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: 1.4 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: 0.6 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: 0.00072 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: 0.43 SJR: 0.318 SNIP: 0.568 CiteScore™:: 3.5 H-Index: 28

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Film Cooling: Breaking the Limits of Diffusion Shaped Holes

Volumen 41, Ausgabe 6, 2010, pp. 627-650
DOI: 10.1615/HeatTransRes.v41.i6.40
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ABSTRAKT

The study of gas turbine film cooling encompasses several thousands of technical papers since the 1960's. Yet today virtually all applications use only two types of film hole geometries, round holes and diffuser shaped holes. There has been no substantive improvement upon diffuser shaped film hole adiabatic effectiveness that has made its way into production turbine components. The present study is an examination of why this apparent limitation has not been overcome. Thirty examples of proposed discrete holes film cooling geometries, including the standard bearer of diffuser shaped holes, are viewed to discern what is possible, what the typical detractors to implementation are, and how the community might go forward to entitlement. Eight key factors are used to judge the application potential for each of the film hole geometries. In the end, while the diffuser shaped film hole is still the best option today, a few other geometries are identified as candidates for significant improvement in film effectiveness. Three examples of film cooling with increasing levels of improvement over diffuser shaped holes are presented for consideration.

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