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research-article

Vane Suction Surface Heat Transfer in Regions of Secondary Flows: The Influence of Turbulence Level, Reynolds Number and the Endwall Boundary Condition

[+] Author and Article Information
Justin Varty

University of North Dakota, Mechanical Engineering Department, Grand Forks, ND, USA 58202
justin.varty@gmail.com

Loren W. Soma

University of North Dakota, Mechanical Engineering Department, Grand Forks, ND, USA 58202
loren.soma@gmail.com

Forrest Ames

University of North Dakota, Mechanical Engineering Department, Grand Forks, ND, USA 58202
forrest.ames@engr.und.edu

Dr. Sumanta Acharya

Illinois Institute of Technology, Mechanical, Materials, and Aerospace Engr., Chicago, Illinois 60616
sacharya1@itt.edu

1Corresponding author.

ASME doi:10.1115/1.4038281 History: Received September 20, 2017; Revised October 04, 2017

Abstract

Secondary flows in vane passages sweep off the endwall and onto the suction surface having an immediate impact on heat transfer. The present paper documents the impact of secondary flows on suction surface heat transfer acquired over a range of turbulence levels (0.7% through 17.4%) and a range of exit chord Reynolds numbers (500,000 through 2,000,000). The vane design includes an aft loaded suction surface and a large leading edge diameter. The heat transfer visualization for the heated endwall condition shows no initial high heat transfer level near the edge of heating on the vane. The heat transfer level in the region affected by the secondary flows is largely uniform, except for a notable depression in an affected region believed due to an upwash region generated above the separation line of the passage vortex, likely in conjunction with the counter rotating suction leg of the horseshoe vortex. The extent and definition of the secondary flow affected region on the suction surface is clearly evident at lower Reynolds numbers and lower turbulence levels when the suction surface flow is largely laminar. The heat transfer in the plateau region has a magnitude similar to a turbulent boundary layer. However, the location and extent of this secondary flow affected region is less perceptible at higher turbulence levels where transitional or turbulent flow is present. Also, aggressive mixing at higher turbulence levels serves to smooth out discernable differences in the heat transfer due to the secondary flows.

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