NDLI: Establishing a Methodology for Resolving Convective Heat Transfer From Complex Geometries

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ostanek, J. Thole, K. Prausa, J. Suetendael, A. Van
Copyright Year	2008
Abstract	Current turbine airfoils must operate at extreme temperatures, which are continuously driven higher by the demand for high output engines. Internal cooling plays a key role in the longevity of gas turbine airfoils. Ribbed channels are commonly used to increase heat transfer by generating turbulence and to provide a greater convective surface area. Because of the increasing complexity in airfoil design and manufacturing, a methodology is needed to accurately measure the convection coefficient of a rib with a complex shape. Previous studies that have measured the contribution to convective heat transfer from the rib itself have used simple rib geometries. This paper presents a new methodology to measure convective heat transfer coefficients on complex ribbed surfaces. The new method was applied to a relatively simple shape so that comparisons could be made with a commonly accepted method for heat transfer measurements. A numerical analysis was performed to reduce experimental uncertainty and to verify the lumped model approximation used in the new methodology. Experimental measurements were taken in a closed-loop channel using fully rounded, discontinuous, skewed ribs oriented 45° to the flow. The channel aspect ratio was 1.7:1 and the ratio of rib height to hydraulic diameter was 0.075. Heat transfer augmentation levels relative to a smooth channel were measured to be between 4.7 and 3 for Reynolds numbers ranging from 10,000 to 100,000.
Sponsorship	International Gas Turbine Institute
Starting Page	1175
Ending Page	1186
Page Count	12
File Format	PDF
ISBN	9780791843147
DOI	10.1115/GT2008-51411
e-ISBN	0791838242
Volume Number	Volume 4: Heat Transfer, Parts A and B
Conference Proceedings	ASME Turbo Expo 2008: Power for Land, Sea, and Air
Language	English
Publisher Date	2008-06-09
Publisher Place	Berlin, Germany
Access Restriction	Subscribed
Subject Keyword	Temperature Turbulence Uncertainty Approximation Cooling Reynolds number Airfoils Flow (dynamics) Convection Engines Design Gas turbines Numerical analysis Shapes Manufacturing Heat transfer Turbines
Content Type	Text
Resource Type	Article

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