Experimental Study on Flow Behavior and Heat Transfer Enhancement With Distinct Dimpled Gas Turbine Blade Internal Cooling Channel

Nourin, Farah Nazifa; Amano, Ryoichi S.

doi:10.1115/1.4052035

Experimental Study on Flow Behavior and Heat Transfer Enhancement With Distinct Dimpled Gas Turbine Blade Internal Cooling Channel

Journal Article · Fri Aug 27 04:00:00 EDT 2021 · Journal of Energy Resources Technology

DOI:https://doi.org/10.1115/1.4052035· OSTI ID:1980667

Nourin, Farah Nazifa ^[1]; Amano, Ryoichi S. ^[2]

Department of Mechanical Engineering, University of Wisconsin-Milwaukee, 115 East, Reindl Way, Glendale, WI 53212; OSTI
Department of Mechanical Engineering, University of Wisconsin-Milwaukee, 115 East, Reindl Way, Glendale, WI 53212

Abstract

The study presents the investigation on heat transfer distribution along a gas turbine blade internal cooling channel. Six different cases were considered in this study, using the smooth surface channel as a baseline. Three different dimples depth-to-diameter ratios with 0.1, 0.25, and 0.50 were considered. Different combinations of partial spherical and leaf dimples were also studied with the Reynolds numbers of 6,000, 20,000, 30,000, 40,000, and 50,000. In addition to the experimental investigation, the numerical study was conducted using a large eddy simulation (LES) to validate the data. It was found that the highest depth-to-diameter ratio showed the highest heat transfer rate. However, the deepest dimpled channel shows the highest pressure drop, which affects the overall thermal performance of the cooling channel. The results showed that the leaf dimpled surface is the best cooling channel based on the highest Reynolds number's heat transfer enhancement and friction factor. However, at the lowest Reynolds number, partial spherical dimples with a 0.25 depth-to-diameter ratio showed the highest thermal performance.

Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: EE0000545

OSTI ID:: 1980667

Journal Information:: Journal of Energy Resources Technology, Journal Name: Journal of Energy Resources Technology Journal Issue: 7 Vol. 144; ISSN 0195-0738

Publisher:: ASME

Country of Publication:: United States

Language:: English

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