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Journal of Enhanced Heat Transfer
Импакт фактор: 0.562 5-летний Импакт фактор: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Печать: 1065-5131
ISSN Онлайн: 1026-5511

Выпуски:
Том 26, 2019 Том 25, 2018 Том 24, 2017 Том 23, 2016 Том 22, 2015 Том 21, 2014 Том 20, 2013 Том 19, 2012 Том 18, 2011 Том 17, 2010 Том 16, 2009 Том 15, 2008 Том 14, 2007 Том 13, 2006 Том 12, 2005 Том 11, 2004 Том 10, 2003 Том 9, 2002 Том 8, 2001 Том 7, 2000 Том 6, 1999 Том 5, 1998 Том 4, 1997 Том 3, 1996 Том 2, 1995 Том 1, 1994

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v5.i1.20
pages 9-21

Distributions of Local Heat Transfer Coefficient on Surfaces with Solid and Perforated Ribs

R. T. Kukreja
Lynntech Inc., 7610 Eastmark Drive, College Station, Texas 77840; Department of Mechanical Engineering, Texas A and M University, College Station, Texas 77843-3123
S. C. Lau
Lynntech Inc., 7610 Eastmark Drive, College Station, Texas 77840; Department of Mechanical Engineering, Texas A and M University, College Station, Texas 77843-3123

Краткое описание

In this experimental investigation, the variations of the local heat transfer coefficient in rib-roughened turbine blade internal cooling passages are examined. Using liquid crystal thermometry, the detailed local heat transfer distributions are determined for turbulent flows through a long, straight, square test channel model with ribs of various configurations, including perforated ribs, on two opposite walls.
Angled and V-shaped solid ribs enhance more heat transfer than transverse solid ribs. Angled solid ribs cause very large spanwise variations of the local heat transfer distribution. With the highest overall heat transfer and relatively small spanwise heat transfer variation, V-shaped ribs are recommended for internal cooling of gas turbine blades. Perforated ribs enhance less heat transfer than solid ribs, because the jet streams leaving the holes interrupt and weaken flow reattachment on the wall downstream of a rib. Increasing the size or the number of holes, or the total hole area, lowers the overall heat transfer. The lower pressure drop caused by perforated ribs reduces the required pumping power, but does not improve the thermal performance.


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