Large Eddy Simulations on Film Cooling Flow Behaviors with Upstream Turbulent Boundary Layer Generated by Circular Cylinder

Large eddy simulations on film cooling hole array on a flat plate was carried out to investigate upstream turbulence effect. Circular cylinders were configured to create a turbulent boundary layer and its diameter has been adjusted to generate 13% upstream turbulence intensity in the main flow. Due...

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Autores principales:	Young Seok Kang, Dong-Ho Rhee, Yu Jin Song, Jae Su Kwak
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	film cooling hole large eddy simulation gas turbine cooling turbine Technology T
Acceso en línea:	https://doaj.org/article/142ef399ad4d488782907eef9f059ae0
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spelling	oai:doaj.org-article:142ef399ad4d488782907eef9f059ae02021-11-11T15:59:48ZLarge Eddy Simulations on Film Cooling Flow Behaviors with Upstream Turbulent Boundary Layer Generated by Circular Cylinder10.3390/en142172271996-1073https://doaj.org/article/142ef399ad4d488782907eef9f059ae02021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7227https://doaj.org/toc/1996-1073Large eddy simulations on film cooling hole array on a flat plate was carried out to investigate upstream turbulence effect. Circular cylinders were configured to create a turbulent boundary layer and its diameter has been adjusted to generate 13% upstream turbulence intensity in the main flow. Due to the small pitch to diameter configuration of the cylinder, two-dimensional LES analysis was carried out in advance and the results showed that LES was an essential method to resolve flow field around and downstream circular cylinder, which was not available in RANS simulations. The three-dimensional LES results showed reasonable agreement in turbulence intensity and normalized velocity distributions along the vertical with measured data. According to the blowing ratio, the cooling flow coverage on the surface along the stream-wise direction was varied and well agreed with measured data. Additionally, upstream boundary flows were partially ingested inside the cooling hole and discharged again near along the centerline of the cooling hole. This accounted for film cooling effectiveness distribution inside the cooling hole surface and along the centerline. The current study revealed that the LES for predicting turbulent boundary layer behaviors due to upstream turbulence generation source was an effective and feasible method. Moreover, the LES effectively resolved flow fields such as film cooling flow behaviors and corresponding film cooling effectiveness distributions.Young Seok KangDong-Ho RheeYu Jin SongJae Su KwakMDPI AGarticlefilm cooling holelarge eddy simulationgas turbinecooling turbineTechnologyTENEnergies, Vol 14, Iss 7227, p 7227 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	film cooling hole large eddy simulation gas turbine cooling turbine Technology T
spellingShingle	film cooling hole large eddy simulation gas turbine cooling turbine Technology T Young Seok Kang Dong-Ho Rhee Yu Jin Song Jae Su Kwak Large Eddy Simulations on Film Cooling Flow Behaviors with Upstream Turbulent Boundary Layer Generated by Circular Cylinder
description	Large eddy simulations on film cooling hole array on a flat plate was carried out to investigate upstream turbulence effect. Circular cylinders were configured to create a turbulent boundary layer and its diameter has been adjusted to generate 13% upstream turbulence intensity in the main flow. Due to the small pitch to diameter configuration of the cylinder, two-dimensional LES analysis was carried out in advance and the results showed that LES was an essential method to resolve flow field around and downstream circular cylinder, which was not available in RANS simulations. The three-dimensional LES results showed reasonable agreement in turbulence intensity and normalized velocity distributions along the vertical with measured data. According to the blowing ratio, the cooling flow coverage on the surface along the stream-wise direction was varied and well agreed with measured data. Additionally, upstream boundary flows were partially ingested inside the cooling hole and discharged again near along the centerline of the cooling hole. This accounted for film cooling effectiveness distribution inside the cooling hole surface and along the centerline. The current study revealed that the LES for predicting turbulent boundary layer behaviors due to upstream turbulence generation source was an effective and feasible method. Moreover, the LES effectively resolved flow fields such as film cooling flow behaviors and corresponding film cooling effectiveness distributions.
format	article
author	Young Seok Kang Dong-Ho Rhee Yu Jin Song Jae Su Kwak
author_facet	Young Seok Kang Dong-Ho Rhee Yu Jin Song Jae Su Kwak
author_sort	Young Seok Kang
title	Large Eddy Simulations on Film Cooling Flow Behaviors with Upstream Turbulent Boundary Layer Generated by Circular Cylinder
title_short	Large Eddy Simulations on Film Cooling Flow Behaviors with Upstream Turbulent Boundary Layer Generated by Circular Cylinder
title_full	Large Eddy Simulations on Film Cooling Flow Behaviors with Upstream Turbulent Boundary Layer Generated by Circular Cylinder
title_fullStr	Large Eddy Simulations on Film Cooling Flow Behaviors with Upstream Turbulent Boundary Layer Generated by Circular Cylinder
title_full_unstemmed	Large Eddy Simulations on Film Cooling Flow Behaviors with Upstream Turbulent Boundary Layer Generated by Circular Cylinder
title_sort	large eddy simulations on film cooling flow behaviors with upstream turbulent boundary layer generated by circular cylinder
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/142ef399ad4d488782907eef9f059ae0
work_keys_str_mv	AT youngseokkang largeeddysimulationsonfilmcoolingflowbehaviorswithupstreamturbulentboundarylayergeneratedbycircularcylinder AT donghorhee largeeddysimulationsonfilmcoolingflowbehaviorswithupstreamturbulentboundarylayergeneratedbycircularcylinder AT yujinsong largeeddysimulationsonfilmcoolingflowbehaviorswithupstreamturbulentboundarylayergeneratedbycircularcylinder AT jaesukwak largeeddysimulationsonfilmcoolingflowbehaviorswithupstreamturbulentboundarylayergeneratedbycircularcylinder
_version_	1718432400136994816

Large Eddy Simulations on Film Cooling Flow Behaviors with Upstream Turbulent Boundary Layer Generated by Circular Cylinder

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