NDLI: High Resolution Heat Transfer Measurement on Flat and Contoured Endwalls in a Linear Cascade

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Laveau, Benoit Reza, S. Abhari Michael, E. Crawford Lutum, Ewald
Copyright Year	2012
Abstract	In order to continue increasing the efficiency of gas turbines, a significant effort is being made to reduce losses induced by secondary flows in turbine stages. In addition to their impact on aerodynamic losses, these vortical structures are also the source of large heat transfer variations across the passage. A substantial reduction of the secondary flow losses can be achieved with a contoured endwall. However, a change in the vortical pattern can dramatically impact the thermal loads on the endwall and lead to higher cooling requirements in those areas. This paper focuses on heat transfer measurements made in a passage with either flat or contoured endwalls. The experimental data are supplemented with numerical predictions of the heat transfer data. The measurements are carried out on an isothermal endwall equipped with symmetric NACA airfoils. The paper presents measurements at M = 0.3 corresponding to a Reynolds number ReCax = 4.6×105. An infrared camera is used to provide high-resolution surface temperature data on the endwall. The surface is equipped with an insulating layer (Kapton) allowing the calculation of heat flux through the endwall. The heat transfer quantities, namely the heat transfer coefficient and the adiabatic wall temperature, are then derived from a set of measurements at different isothermal plate temperatures. The numerical predictions clarify the link between the change in the heat transfer quantities and the changes in the flow field due to endwall contouring. Finally numerically predicted heat transfer data are deducted from a set of adiabatic and diabatic simulations that are compared to the experimental data. The comparison focuses on the differences in the regions with endwall contouring, where a significant difference in the heat transfer coefficient between flat and contoured endwalls is measured, but under-predicted numerically.
Sponsorship	International Gas Turbine Institute
Starting Page	657
Ending Page	668
Page Count	12
File Format	PDF
ISBN	9780791844700
DOI	10.1115/GT2012-69737
Volume Number	Volume 4: Heat Transfer, Parts A and B
Conference Proceedings	ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2012-06-11
Publisher Place	Copenhagen, Denmark
Access Restriction	Subscribed
Subject Keyword	Temperature Cooling Naca airfoils Cascades (fluid dynamics) Reynolds number Flow (dynamics) Heat flux Stress Wall temperature Gas turbines Simulation Resolution (optics) Engineering simulation Heat transfer coefficients Heat transfer Turbines
Content Type	Text
Resource Type	Article

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