Direct numerical simulation of air-cooled and air-heated channels

Davide Modesti; Sergio Pirozzoli

doi:10.1115/GT2024-122883

Direct numerical simulation of air-cooled and air-heated channels

^*Corresponding author for this work

Aerodynamics

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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Abstract

We develop a theoretical framework for predicting friction and heat transfer coefficients in variable-properties forced-air convection, as typical of turbine blade cooling. To do this, we borrow concepts from high-speed wall turbulence, also featuring large temperature and density variations. Using the mean momentum balance and mean thermal balance equations we develop integral transformations that account for the effect of the variable fluid properties, and apply the inverse transformations to calculate the friction and heat transfer coefficients. The proposed theory is validated using a direct numerical simulation dataset spanning both heating and cooling conditions, and the predicted friction and heat transfer coefficients match DNS data with 1–2% accuracy.

Original language	English
Title of host publication	Heat Transfer
Subtitle of host publication	Internal Air Systems; Heat Transfer: Internal Cooling; Industrial and Cogeneration
Publisher	The American Society of Mechanical Engineers (ASME)
Number of pages	7
ISBN (Electronic)	9780791888001
DOIs	https://doi.org/10.1115/GT2024-122883
Publication status	Published - 2024
Event	69th ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition, GT 2024 - London, United Kingdom Duration: 24 Jun 2024 → 28 Jun 2024

Publication series

Name	Proceedings of the ASME Turbo Expo
Volume	8

Conference

Conference	69th ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition, GT 2024
Country/Territory	United Kingdom
City	London
Period	24/06/24 → 28/06/24

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

direct numerical simulation
forced thermal convection
forced-air convection
variable-fluid properties

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10.1115/GT2024-122883

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Cite this

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title = "Direct numerical simulation of air-cooled and air-heated channels",

abstract = "We develop a theoretical framework for predicting friction and heat transfer coefficients in variable-properties forced-air convection, as typical of turbine blade cooling. To do this, we borrow concepts from high-speed wall turbulence, also featuring large temperature and density variations. Using the mean momentum balance and mean thermal balance equations we develop integral transformations that account for the effect of the variable fluid properties, and apply the inverse transformations to calculate the friction and heat transfer coefficients. The proposed theory is validated using a direct numerical simulation dataset spanning both heating and cooling conditions, and the predicted friction and heat transfer coefficients match DNS data with 1–2% accuracy.",

keywords = "direct numerical simulation, forced thermal convection, forced-air convection, variable-fluid properties",

author = "Davide Modesti and Sergio Pirozzoli",

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language = "English",

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Modesti, D & Pirozzoli, S 2024, Direct numerical simulation of air-cooled and air-heated channels. in Heat Transfer: Internal Air Systems; Heat Transfer: Internal Cooling; Industrial and Cogeneration., V008T15A008, Proceedings of the ASME Turbo Expo, vol. 8, The American Society of Mechanical Engineers (ASME), 69th ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition, GT 2024, London, United Kingdom, 24/06/24. https://doi.org/10.1115/GT2024-122883

Direct numerical simulation of air-cooled and air-heated channels. / Modesti, Davide; Pirozzoli, Sergio.
Heat Transfer: Internal Air Systems; Heat Transfer: Internal Cooling; Industrial and Cogeneration. The American Society of Mechanical Engineers (ASME), 2024. V008T15A008 (Proceedings of the ASME Turbo Expo; Vol. 8).

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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N2 - We develop a theoretical framework for predicting friction and heat transfer coefficients in variable-properties forced-air convection, as typical of turbine blade cooling. To do this, we borrow concepts from high-speed wall turbulence, also featuring large temperature and density variations. Using the mean momentum balance and mean thermal balance equations we develop integral transformations that account for the effect of the variable fluid properties, and apply the inverse transformations to calculate the friction and heat transfer coefficients. The proposed theory is validated using a direct numerical simulation dataset spanning both heating and cooling conditions, and the predicted friction and heat transfer coefficients match DNS data with 1–2% accuracy.

AB - We develop a theoretical framework for predicting friction and heat transfer coefficients in variable-properties forced-air convection, as typical of turbine blade cooling. To do this, we borrow concepts from high-speed wall turbulence, also featuring large temperature and density variations. Using the mean momentum balance and mean thermal balance equations we develop integral transformations that account for the effect of the variable fluid properties, and apply the inverse transformations to calculate the friction and heat transfer coefficients. The proposed theory is validated using a direct numerical simulation dataset spanning both heating and cooling conditions, and the predicted friction and heat transfer coefficients match DNS data with 1–2% accuracy.

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Direct numerical simulation of air-cooled and air-heated channels

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