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research-article

THREE DIMENSIONAL VELOCITY AND TEMPERATURE FIELD MEASUREMENTS OF INTERNAL AND EXTERNAL TURBINE BLADE FEATURES USING MAGNETIC RESONANCE THERMOMETRY

[+] Author and Article Information
Michael J. Benson

Civil and Mechanical Engineering West Point, NY 10996 mjben007@gmail.com

Bret P. Van Poppel

Bldg 752 Thayer Rd. West Point, NY 10996 vanpoppelb@gmail.com

Christopher J. Elkins

488 Escondido Mall Bldg. 500, Rm. 500K Stanford, CA 94305 celkins@stanford.edu

Mark Owkes

Roberts 203, Montana State University P.O. Box 173800 Bozeman, MT 59717-3800 mark.owkes@montana.edu

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Turbomachinery. Manuscript received February 21, 2019; final manuscript received March 8, 2019; published online xx xx, xxxx. Assoc. Editor: Kenneth Hall.

ASME doi:10.1115/1.4043151 History: Received February 21, 2019; Accepted March 11, 2019

Abstract

Magnetic Resonance Thermometry (MRT) is a maturing diagnostic used to measure three-dimensional temperature fields. It has great potential for investigating fluid flows within complex geometries leveraging medical grade MRI equipment and software along with novel measurement techniques. In this study, a challenging geometry is presented with direct application to a complex gas turbine blade cooling scheme. Turbulent external flow with a Reynolds number of 136,000 passes a hollowed NACA-0012 airfoil with internal cooling features. Inserts within the airfoil, fed by a second flow line with an average temperature difference of 30 K from the main flow and a temperature-dependent Reynolds number in excess of 1,800, produce a conjugate heat transfer scenario including impingement cooling on the inside surface of the airfoil. The airfoil cooling scheme also includes zonal recirculation, surface film cooling, and trailing edge ejection features. The entire airfoil surface is constructed of a stereolithography resin – Accura 60 – with low thermal conductivity. The three-dimensional internal and external velocity field is measured using MRV. The fluid temperature field is measured within and outside of the airfoil with MRT and the results are compared with a computational fluid dynamics (CFD) solution to assess the current state of the art for combined MRV/MRT techniques for investigating these complex internal and external flows. The accompanying CFD analysis provides a prediction of the velocity and temperature fields, allowing for errors in the MRT technique to be estimated.

Copyright © 2019 by ASME
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