This study investigates the effect of wakes in the presence of varying levels of background freestream turbulence on the heat (mass) transfer from gas turbine blades. Measurements using the naphthalene sublimation technique provide local values of the mass transfer coefficient on the pressure and suction surfaces of a simulated turbine blade in a linear cascade. Experimental parameters studied include the pitch of the wake-generating blades (vanes), blade-row separation, Reynolds number, and the freestream turbulence level. The disturbed flow strongly affects the mass transfer Stanton number on both sides of the blade, particularly along the suction surface. An earlier transition to a turbulent boundary layer occurs with increased background turbulence, higher Reynolds number, and from wakes shed from vanes placed upstream of the linear cascade. Note that once the effects on mass transfer are known, similar variation on heat transfer can be inferred from the heat/mass transfer analogy.
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e-mail: surachaikmutt@yahoo.co.th
e-mail: kalmech@me.umn.edu
e-mail: rjg@me.umn.edu
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January 2011
Research Papers
Effect of Wake-Disturbed Flow on Heat (Mass) Transfer to a Turbine Blade
S. Sanitjai,
S. Sanitjai
Department of Mechanical Engineering,
e-mail: surachaikmutt@yahoo.co.th
King Mongkut’s University of Technology
, Thonburi, Bangkok 10140, Thailand
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K. Ghosh,
K. Ghosh
Graduate Research Assistant
Mem. ASME
Department of Mechanical Engineering, Heat Transfer Laboratory,
e-mail: kalmech@me.umn.edu
University of Minnesota
, Minneapolis, MN 55455
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R. J. Goldstein
R. J. Goldstein
Regents’ Professor
Mem. ASME
Department of Mechanical Engineering, Heat Transfer Laboratory,
e-mail: rjg@me.umn.edu
University of Minnesota
, Minneapolis, MN 55455
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S. Olson
S. Sanitjai
Department of Mechanical Engineering,
King Mongkut’s University of Technology
, Thonburi, Bangkok 10140, Thailande-mail: surachaikmutt@yahoo.co.th
K. Ghosh
Graduate Research Assistant
Mem. ASME
Department of Mechanical Engineering, Heat Transfer Laboratory,
University of Minnesota
, Minneapolis, MN 55455e-mail: kalmech@me.umn.edu
R. J. Goldstein
Regents’ Professor
Mem. ASME
Department of Mechanical Engineering, Heat Transfer Laboratory,
University of Minnesota
, Minneapolis, MN 55455e-mail: rjg@me.umn.edu
J. Turbomach. Jan 2011, 133(1): 011015 (8 pages)
Published Online: September 22, 2010
Article history
Received:
April 9, 2009
Revised:
July 31, 2009
Online:
September 22, 2010
Published:
September 22, 2010
Citation
Olson, S., Sanitjai, S., Ghosh, K., and Goldstein, R. J. (September 22, 2010). "Effect of Wake-Disturbed Flow on Heat (Mass) Transfer to a Turbine Blade." ASME. J. Turbomach. January 2011; 133(1): 011015. https://doi.org/10.1115/1.4000538
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