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research-article

Modeling and Measurements of Heat/Mass Transfer in a Linear Turbine Cascade

[+] Author and Article Information
Francesco Papa

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, 111 Church St SE, Minneapolis, MN-55455, USA
frc.papa@gmail.com

Umesh Madanan

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, 111 Church St SE, Minneapolis, MN-55455, USA
madan016@umn.edu

Richard Goldstein

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, 111 Church St SE, Minneapolis, MN-55455, USA
rjgme@umn.edu

1Corresponding author.

ASME doi:10.1115/1.4036106 History: Received September 29, 2016; Revised February 21, 2017

Abstract

Measurements of the mass/heat transfer coefficients on the blade and endwall surfaces of a linear turbine cascade are compared to numerical predictions using the standard Shear Stress Transport (SST) closure and the SST model in combination with the Re?-? transition model. Experiments were carried out in a wind tunnel test section composed of five large-scale turbine blades, using the naphthalene sublimation technique. Two cases were tested, with exit Reynolds number of 600,000 and inlet turbulence values of 0.2% and 4% respectively. The main secondary flow features, consisting of the horseshoe vortex system, the passage vortex and the corner vortices are identified and their influence on heat/mass transfer is analyzed. Numerical simulations were carried out to match the conditions of the experiments. Results show that large improvements are obtained with the introduction of the Re?-? transition model. In particular, excellent agreement with the experiments is found, for the whole spanwise extension of the blade, on the pressure surface. On the suction surface, performance is very good in the highly three-dimensional region close to the endwall, but some weaknesses appear in predicting the location of transition in the two dimensional region. On the endwall surface, the SST model in combination with the transition model produces satisfactory results, greatly improved compared to the standard SST model.

Copyright (c) 2017 by ASME
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