Effect of main stream turbulence on the film cooling effectiveness of a circular and a fan-shaped film cooling hole

The reliability of turbine blades and vanes of modern high temperature gas turbines is assured by turbine blade cooling technologies. Among the various cooling methods, film cooling has been a key technology to ensure the long-term operation of turbine blades and vanes that are exposed to hot gas-pa...

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Autores principales:	Kenichiro TAKEISHI, Yutaka ODA, Shohei MORI, Robert KREWINKEL
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	gas turbine film cooling heat transfer laser induced fluorescence particle image velocimetry Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/fd892fd098f44353961dfa928dfc1bd7
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id	oai:doaj.org-article:fd892fd098f44353961dfa928dfc1bd7
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spelling	oai:doaj.org-article:fd892fd098f44353961dfa928dfc1bd72021-11-29T05:59:26ZEffect of main stream turbulence on the film cooling effectiveness of a circular and a fan-shaped film cooling hole2187-974510.1299/mej.20-00176https://doaj.org/article/fd892fd098f44353961dfa928dfc1bd72020-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/4/7_20-00176/_pdf/-char/enhttps://doaj.org/toc/2187-9745The reliability of turbine blades and vanes of modern high temperature gas turbines is assured by turbine blade cooling technologies. Among the various cooling methods, film cooling has been a key technology to ensure the long-term operation of turbine blades and vanes that are exposed to hot gas-path flows. Therefore, many papers have been published aiming at the improvement of film cooling effectiveness by optimization of film cooling hole geometries. Although the turbulence intensity of the mainstream generated in the gas turbine combustor is very high and may reduce the film cooling effect on the turbine vane and blade, there are few papers investigating quantitatively the effect of the mainstream turbulence on the film cooling. For this reason, the influence of mainstream turbulence intensity on film cooling effectiveness was investigated with an active turbulence generator equipped with electric-motor driven propellers for circular and fan-shaped film cooling holes. Spatial distributions of the turbulent mixing field between turbulent mainstream and film coolant jet were measured with quantitative measurement methods, such as PIV and LIF. As a result, it was revealed that when the mainstream turbulence is high the counter-rotating vortex pair is weakened, the film cooling air spreads in the span-wise direction and the lateral-averaged film cooling effectiveness decreases about 10%.Kenichiro TAKEISHIYutaka ODAShohei MORIRobert KREWINKELThe Japan Society of Mechanical Engineersarticlegas turbinefilm coolingheat transferlaser induced fluorescenceparticle image velocimetryMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 4, Pp 20-00176-20-00176 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	gas turbine film cooling heat transfer laser induced fluorescence particle image velocimetry Mechanical engineering and machinery TJ1-1570
spellingShingle	gas turbine film cooling heat transfer laser induced fluorescence particle image velocimetry Mechanical engineering and machinery TJ1-1570 Kenichiro TAKEISHI Yutaka ODA Shohei MORI Robert KREWINKEL Effect of main stream turbulence on the film cooling effectiveness of a circular and a fan-shaped film cooling hole
description	The reliability of turbine blades and vanes of modern high temperature gas turbines is assured by turbine blade cooling technologies. Among the various cooling methods, film cooling has been a key technology to ensure the long-term operation of turbine blades and vanes that are exposed to hot gas-path flows. Therefore, many papers have been published aiming at the improvement of film cooling effectiveness by optimization of film cooling hole geometries. Although the turbulence intensity of the mainstream generated in the gas turbine combustor is very high and may reduce the film cooling effect on the turbine vane and blade, there are few papers investigating quantitatively the effect of the mainstream turbulence on the film cooling. For this reason, the influence of mainstream turbulence intensity on film cooling effectiveness was investigated with an active turbulence generator equipped with electric-motor driven propellers for circular and fan-shaped film cooling holes. Spatial distributions of the turbulent mixing field between turbulent mainstream and film coolant jet were measured with quantitative measurement methods, such as PIV and LIF. As a result, it was revealed that when the mainstream turbulence is high the counter-rotating vortex pair is weakened, the film cooling air spreads in the span-wise direction and the lateral-averaged film cooling effectiveness decreases about 10%.
format	article
author	Kenichiro TAKEISHI Yutaka ODA Shohei MORI Robert KREWINKEL
author_facet	Kenichiro TAKEISHI Yutaka ODA Shohei MORI Robert KREWINKEL
author_sort	Kenichiro TAKEISHI
title	Effect of main stream turbulence on the film cooling effectiveness of a circular and a fan-shaped film cooling hole
title_short	Effect of main stream turbulence on the film cooling effectiveness of a circular and a fan-shaped film cooling hole
title_full	Effect of main stream turbulence on the film cooling effectiveness of a circular and a fan-shaped film cooling hole
title_fullStr	Effect of main stream turbulence on the film cooling effectiveness of a circular and a fan-shaped film cooling hole
title_full_unstemmed	Effect of main stream turbulence on the film cooling effectiveness of a circular and a fan-shaped film cooling hole
title_sort	effect of main stream turbulence on the film cooling effectiveness of a circular and a fan-shaped film cooling hole
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/fd892fd098f44353961dfa928dfc1bd7
work_keys_str_mv	AT kenichirotakeishi effectofmainstreamturbulenceonthefilmcoolingeffectivenessofacircularandafanshapedfilmcoolinghole AT yutakaoda effectofmainstreamturbulenceonthefilmcoolingeffectivenessofacircularandafanshapedfilmcoolinghole AT shoheimori effectofmainstreamturbulenceonthefilmcoolingeffectivenessofacircularandafanshapedfilmcoolinghole AT robertkrewinkel effectofmainstreamturbulenceonthefilmcoolingeffectivenessofacircularandafanshapedfilmcoolinghole
_version_	1718407625213739008

Effect of main stream turbulence on the film cooling effectiveness of a circular and a fan-shaped film cooling hole

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