Research Papers: Energy Systems Analysis

Evaluating the Impact of Free-Stream Turbulence on Convective Cooling of Overhead Conductors Using Large Eddy Simulations

[+] Author and Article Information
Mohamed Abdelhady

Laboratory for Turbulence Research in
Aerodynamics and Flow Control (LTRAC),
Department of Mechanical and
Manufacturing Engineering,
University of Calgary,
Calgary, AB T2 L 1Y6, Canada
e-mail: Mohamed.Abdelhady@ucalgary.ca

David H. Wood

Schulich Chair in Renewable Energy,
Laboratory for Turbulence Research in
Aerodynamics and Flow Control (LTRAC),
Department of Mechanical and
Manufacturing Engineering,
University of Calgary,
Calgary, AB T2 L 1Y6, Canada
e-mail: dhwood@ucalgary.ca

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 23, 2018; final manuscript received November 16, 2018; published online January 30, 2019. Assoc. Editor: Reza Baghaei Lakeh.

J. Energy Resour. Technol 141(6), 062010 (Jan 30, 2019) (9 pages) Paper No: JERT-18-1651; doi: 10.1115/1.4042401 History: Received August 23, 2018; Revised November 16, 2018

The international trend of using renewable energy sources for generating electricity is increasing, partly through harvesting energy from wind turbines. Increasing electric power transmission efficiency is achievable through using real-time weather data for power line rating, known as real-time thermal rating (RTTR), instead of using the worst case scenario weather data, known as static rating. RTTR is particularly important for wind turbine connections to the grid, as wind power output and overhead conductor rating both increase with increasing wind speed, which should significantly increase real-time rated conductor from that of statically rated. Part of the real-time weather data is the effect of free-stream turbulence, which is not considered by the commonly used overhead conductor codes, Institute of Electrical and Electronics Engineers (IEEE) 738 and International Council on Large Electric Systems (CIGRÉ) 207. This study aims to assess the effect free-stream turbulence on IEEE 738 and CIGRÉ 207 forced cooling term. The study uses large eddy simulation (LES) in the ANSYS fluent software. The analysis is done for low wind speed, corresponding to Reynolds number of 3000. The primary goal is to calculate Nusselt number for cylindrical conductors with free-stream turbulence. Calculations showed an increase in convective heat transfer from the low turbulence value by ∼30% at turbulence intensity of 21% and length scale to diameter ratio of 0.4; an increase of ∼19% at turbulence intensity of 8% and length scale to diameter ratio of 0.4; and an increase of ∼15% at turbulence intensity of 6% and length scale to diameter ratio of 0.6.

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Grahic Jump Location
Fig. 1

Internal grid-generated turbulence domain. Only the ends of the conductor are shown.

Grahic Jump Location
Fig. 2

Inlet grid-generated turbulence domain. Only the ends of the conductor are shown.

Grahic Jump Location
Fig. 3

Dimensionless wall distance, Y+, around conductor surface

Grahic Jump Location
Fig. 4

Streamwise turbulence velocity spectrum for case 2. fc∼300 Hz.

Grahic Jump Location
Fig. 5

Comparison of Cp with other references. Data at Re=3000, Re=4020, Re=4600, Re=5000, Re=20,100, Re=27,000, Re=37,400, and Re=38,200 are taken from Refs. [73], [78], [79], [79], [18], [77], [80] and [80], respectively. (a) Cp comparison with other references and (b) effect of Tu on Cp, exp. references.

Grahic Jump Location
Fig. 6

Comparison of Nuθ at Re = 3000. All experimental data are from Ref. [88] and exact data from Ref. [87]. Q: constant heat flux. Tu is negligible if not given.



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