Experimental investigation of heat transfer performance in turbine airfoil cooling channels roughened with wrap-around ribs

Permanent URL: http://hdl.handle.net/2047/D20213264
Title:
Experimental investigation of heat transfer performance in turbine airfoil cooling channels roughened with wrap-around ribs
Creator:
Yang, Fan (Author)
Contributor:
Taslim, Mohammad (Advisor)
Taslim, Mohammad (Committee member)
Language:
English
Publisher:
Boston, Massachusetts : Northeastern University, 2016
Date Accepted:
May 2016
Date Awarded:
August 2016
Type of resource:
Text
Genre:
Masters theses
Format:
electronic
Digital origin:
born digital
Abstract/Description:
Gas turbine is a type of internal combustion engine. Cooling of turbine airfoils is one useful way to obtain higher thermal efficiency and lower fuel consumption. In this study, an experimental investigation is carried out to study the heat transfer performance in a mid-chord turbine airfoil cooling channel roughened with wrap-around ribs. Steady-state liquid crystal thermography technique is employed for the heat transfer tests. The experiments are focused on two channel geometries of aspect ratio 1 and 3 that are roughened with several rib geometries with and without wrap-arounds. The Reynolds number range is from 10000 to 80000. The effect of wrap-arounds, pitch to height ratio, rib angle and rib arrangement (staggered and criss-cross) are discussed. In addition to the measurement of heat transfer coefficient, for each geometry, the pressure drop along the test section is measured and the Darcy friction factor is reported.

Major conclusions of this study are: a) wrap-arounds generally produce higher heat transfer coefficients than the ribs without wrap-arounds, b) ribs with wrap-arounds produced higher friction factors, c) area-weighted average Nusselt numbers monotonically increase with the Reynolds number, d) enhancement factors decrease with the increase of Reynolds number, e) with almost the same friction factors, staggered ribs are more effective than the criss-crossed ribs.
Subjects and keywords:
cooling channels
turbine airfoil
wrap-around ribs
Gas-turbines -- Thermodynamics
Heat -- Transmission
Aerofoils -- Cooling
Internal combustion engines
DOI:
https://doi.org/10.17760/D20213264
Permanent Link:
http://hdl.handle.net/2047/D20213264
Use and reproduction:
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